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的关联查询，数据库表除了前面小节中已经定义好的用户表...","2026-09-12T08:29:57.518395Z",[87],[],{"permalink":412,"excerpt":407,"lastModifyTime":413,"phase":116},"\u002Farchives\u002Fmybaitsplus-join-query","2026-09-13T05:25:32.424638Z",[415],{"metadata":416,"spec":417,"status":418,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":420,"spec":423,"status":432,"categories":436},{"name":421,"creationTimestamp":422},"post-mybaitsplus-enum-value-745dbc08","2026-09-12T08:29:56.730649Z",{"title":424,"slug":425,"cover":426,"excerpt":427,"publishTime":429,"categories":430,"tags":431,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Mybatis Plus 通用枚举（图文讲解）","mybaitsplus-enum-value","\u002Fupload\u002F167359425246371-MHdo.jpg",{"raw":428,"autoGenerate":93},"\r\n大家好，本小节中，我们将讲解 Mybatis Plus 通用枚举的用法。那么，什么是通用枚举呢？之前小节中，我们的用户表有个性别字段 gender，在插入数据时，我们的示例代码大致如下...","2026-09-12T08:29:56.787230Z",[87],[],{"permalink":433,"excerpt":434,"lastModifyTime":435,"phase":116},"\u002Farchives\u002Fmybaitsplus-enum-value","本小节中，我们将讲解 Mybatis Plus 通用枚举的用法。那么，什么是通用枚举呢？之前小节中，我们的用户表有个性别字段 gender，在插入数据时，我们的示例代码大致如下...","2026-09-13T05:25:33.487169Z",[437],{"metadata":438,"spec":439,"status":440,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":442,"spec":445,"status":454,"categories":458},{"name":443,"creationTimestamp":444},"post-mybaitsplus-common-annotation-80f197dc","2026-09-12T08:29:56.056296Z",{"title":446,"slug":447,"cover":448,"excerpt":449,"publishTime":451,"categories":452,"tags":453,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Mybatis Plus 常用注解（超详细）","mybaitsplus-common-annotation","\u002Fupload\u002F167334634342163-ZyfL.jpg",{"raw":450,"autoGenerate":93},"大家好，本文主要带大家来看下 Mybatis Plus 框架中，使用频率非常高的几个注解及其属性值，因为编写此本教程目的是为了大家快速入门并使用 Mybatis Plus，关于注解更高级的用法请参考官网...","2026-09-12T08:29:56.114067Z",[87],[],{"permalink":455,"excerpt":456,"lastModifyTime":457,"phase":116},"\u002Farchives\u002Fmybaitsplus-common-annotation","本文主要带大家来看下 Mybatis Plus 框架中，使用频率非常高的几个注解及其属性值，因为编写此本教程目的是为了大家快速入门并使用 Mybatis Plus，关于注解更高级的用法请参考官网...","2026-09-13T05:25:33.983128Z",[459],{"metadata":460,"spec":461,"status":462,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":464,"spec":467,"status":476,"categories":479},{"name":465,"creationTimestamp":466},"post-mybaitsplus-code-generator-c984d27c","2026-09-12T08:29:55.452199Z",{"title":468,"slug":469,"cover":470,"excerpt":471,"publishTime":473,"categories":474,"tags":475,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},"Mybatis Plus 代码生成器（图文讲解）","mybaitsplus-code-generator","\u002Fupload\u002F167387297654896-aKtE.jpg",{"raw":472,"autoGenerate":93},"本小节中，我们将学习如何使用 Mybatis Plus 的代码生成器。可能有效小伙伴会疑惑，这玩意是干嘛使的？通常在实际项目开发中，如果开发一个功能，我们会先进行表设计，技术方案的确定，技术经理评估 OK 以后，才会进行项目开发，而不是一上来就写代码，跟无头苍蝇一样...","2026-09-12T08:29:55.508709Z",[87],[],{"permalink":477,"excerpt":472,"lastModifyTime":478,"phase":116},"\u002Farchives\u002Fmybaitsplus-code-generator","2026-09-13T05:25:35.131214Z",[480],{"metadata":481,"spec":482,"status":483,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"metadata":485,"spec":486,"status":490,"categories":491,"content":496},{"name":232,"creationTimestamp":233},{"title":235,"slug":236,"cover":237,"excerpt":487,"publishTime":240,"categories":488,"tags":489,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":239,"autoGenerate":93},[87],[],{"permalink":244,"excerpt":239,"lastModifyTime":245,"phase":116},[492],{"metadata":493,"spec":494,"status":495,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"content":497,"raw":498},"\u003Cp>\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何在 Mybatis Plus 中实现动态表名。*啥是动态表名呢？*我们都知道，当数据库单表存储数据太多时（比如单表超过 1000 万条数据），会严重影响查询效率，这就需要进行水平切分操作，将数据分别存储到不同表中。\u003C\u002Fp>\n\u003Cp>举个栗子，假设某个产品预估将会增长到 3000 万用户，开发人员在设计阶段对用户表进行了分表，创建了 3 张表，通过用户 ID 进行模 3 操作，将数据均匀的存放到这 3 张表中，那么，在代码层处理时，需要动态生成表名。\u003C\u002Fp>\n\u003Ch2>数据库表与数据\u003C\u002Fh2>\n\u003Cp>为了演示，先新建三张用户表 \u003Ccode>t_user_0\u003C\u002Fcode> 、 \u003Ccode>t_user_1\u003C\u002Fcode>  和 \u003Ccode>t_user_2\u003C\u002Fcode> ，并通过 \u003Ccode>user_id\u003C\u002Fcode> 字段进行取模存储：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167420281572597-bWCR.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>建表语句如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>CREATE TABLE `t_user_0` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增ID',\n  `user_id` bigint(20) unsigned NOT NULL COMMENT '用户ID（主键）',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT '0' COMMENT '性别，0：女 1：男',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';\n\nCREATE TABLE `t_user_1` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增ID',\n  `user_id` bigint(20) unsigned NOT NULL COMMENT '用户ID（主键）',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT '0' COMMENT '性别，0：女 1：男',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';\n\nCREATE TABLE `t_user_2` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增ID',\n  `user_id` bigint(20) unsigned NOT NULL COMMENT '用户ID（主键）',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT '0' COMMENT '性别，0：女 1：男',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>注意，因为水平分表的缘故，为了保证注解的唯一性，所以三张表的实际主键为 \u003Ccode>user_id\u003C\u002Fcode> 字段，在插入数据时，通过对用户 ID 取模（userId % 3）将数据放到对应的表中。\u003C\u002Fp>\n\u003Cp>接下来，分别向 3 张表中插入几条测试数据：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>INSERT INTO `t_user_0` (`id`, `user_id`, `name`, `age`, `gender`)\nVALUES\n (1, 1616332498122366978, '张三', 30, 1);\n\nINSERT INTO `t_user_1` (`id`, `user_id`, `name`, `age`, `gender`)\nVALUES\n (1, 1616332498571157505, '张三', 30, 1);\n\nINSERT INTO `t_user_2` (`id`, `user_id`, `name`, `age`, `gender`)\nVALUES\n (1, 1616332498319499266, '张三', 20, 1);\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch2>开始\u003C\u002Fh2>\n\u003Cp>数据准备好了以后，新建一个 Spring Boot 示例工程。\u003C\u002Fp>\n\u003Ch3>示例工程结构\u003C\u002Fh3>\n\u003Cp>先放一张工程结构的截图，后续会一一创建每个类：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167420290798353-EVvQ.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Ch3>添加依赖\u003C\u002Fh3>\n\u003Cp>在 Maven 的 \u003Ccode>pom.xml\u003C\u002Fcode> 配置文件中，添加如下依赖：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>        <!-- lombok，免写繁琐的 get\u002Fset 等方法 -->\n        <dependency>\n            <groupId>org.projectlombok<\u002FgroupId>\n            <artifactId>lombok<\u002FartifactId>\n            <optional>true<\u002Foptional>\n        <\u002Fdependency>\n        <!-- 单元测试 -->\n        <dependency>\n            <groupId>org.springframework.boot<\u002FgroupId>\n            <artifactId>spring-boot-starter-test<\u002FartifactId>\n            <scope>test<\u002Fscope>\n        <\u002Fdependency>\n\n        <!-- mybatis-plus 依赖 -->\n        <dependency>\n            <groupId>com.baomidou<\u002FgroupId>\n            <artifactId>mybatis-plus-boot-starter<\u002FartifactId>\n            <version>3.5.2<\u002Fversion>\n        <\u002Fdependency>\n\n        <!-- mysql 依赖 -->\n        <dependency>\n            <groupId>mysql<\u002FgroupId>\n            <artifactId>mysql-connector-java<\u002FartifactId>\n        <\u002Fdependency>\n\n        <!-- p6spy 组件，可以完整打印实际执行 SQL -->\n        <dependency>\n            <groupId>p6spy<\u002FgroupId>\n            <artifactId>p6spy<\u002FartifactId>\n            <version>3.9.1<\u002Fversion>\n        <\u002Fdependency>\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>yml 配置\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>application.yml\u003C\u002Fcode> 文件中添加数据库相关配置：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-yml\">spring:\n  datasource:\n    driver-class-name: com.p6spy.engine.spy.P6SpyDriver\n    url: jdbc:p6spy:mysql:\u002F\u002F127.0.0.1:3306\u002Fmaster_db?characterEncoding=utf-8\n    username: root\n    password: 123456\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>TIP : 这里使用到了 \u003Ccode>p6spy\u003C\u002Fcode> 组件，用于打印完整的执行 SQL ，有兴趣的小伙伴可参考下文：\u003C\u002Fp>\n\u003Cp>《Mybatis Plus 打印 SQL 语句（包含执行耗时）》\u003Cspan>\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" style=\"color: #aaa; margin-left: 3px;\" aria-hidden=\"true\" focusable=\"false\" x=\"0px\" y=\"0px\" viewBox=\"0 0 100 100\" width=\"15\" height=\"15\" class=\"icon outbound\">\u003Cpath fill=\"currentColor\" d=\"M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z\">\u003C\u002Fpath> \u003Cpolygon fill=\"currentColor\" points=\"45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9\">\u003C\u002Fpolygon>\u003C\u002Fsvg> \u003Cspan class=\"sr-only\">\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3>新建参数传递辅助类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下新建 \u003Ccode>RequestDataHelper\u003C\u002Fcode> 类，用于传递动态表名所需参数：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>\u002F**\n * 请求参数传递辅助类\n *\u002F\npublic class RequestDataHelper {\n    \u002F**\n     * 请求参数存取\n     *\u002F\n    private static final ThreadLocal<Map<String, Object>> REQUEST_DATA = new ThreadLocal<>();\n\n    \u002F**\n     * 设置请求参数\n     *\n     * @param requestData 请求参数 MAP 对象\n     *\u002F\n    public static void setRequestData(Map<String, Object> requestData) {\n        REQUEST_DATA.set(requestData);\n    }\n\n    \u002F**\n     * 获取请求参数\n     *\n     * @param param 请求参数\n     * @return 请求参数 MAP 对象\n     *\u002F\n    public static <T> T getRequestData(String param) {\n        Map<String, Object> dataMap = getRequestData();\n        if (CollectionUtils.isNotEmpty(dataMap)) {\n            return (T) dataMap.get(param);\n        }\n        return null;\n    }\n\n    \u002F**\n     * 获取请求参数\n     *\n     * @return 请求参数 MAP 对象\n     *\u002F\n    public static Map<String, Object> getRequestData() {\n        return REQUEST_DATA.get();\n    }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>新建 Mybatis Plus 配置类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下，添加 Mybatis Plus 配置类：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@Configuration\n@MapperScan("com.mashangan.mybatisplusdemo.mapper")\npublic class MybatisPlusConfig {\n    \u002F**\n     * 添加动态表名插件\n     **\u002F\n    @Bean\n    public MybatisPlusInterceptor mybatisPlusInterceptor() {\n        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();\n        DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();\n        dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> {\n            \u002F\u002F 获取参数方法\n            Map<String, Object> paramMap = RequestDataHelper.getRequestData();\n            if (CollectionUtils.isNotEmpty(paramMap)) {\n                paramMap.forEach((k, v) -> System.err.println(k + "----" + v));\n\t\t\t\t\u002F\u002F 获取传递的参数\n                Long userId = (Long) paramMap.get("user_id");\n                \u002F\u002F 水平分表 3 张，对 ID 进行取模决定表名后缀\n                String tableNameSuffix = "_" + userId % 3;\n                \u002F\u002F 组装动态表名\n                return tableName + tableNameSuffix;\n            }\n            return tableName;\n        });\n        interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);\n        \u002F\u002F 3.4.3.2 作废该方式\n        \u002F\u002F dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map);\n        return interceptor;\n    }\n\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>注意\u003C\u002Fstrong>：考虑到项目中可能会添加多个插件，需要注意顺序关系，官方推荐顺序如下：\u003C\u002Fp>\n\u003Cp>多租户插件 -> 动态表名插件 -> 分页插件 -> 乐观锁插件 -> sql 性能规范插件 -> 防止全表更新与删除插件。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3>新建数据库实体类\u003C\u002Fh3>\n\u003Cpre>\u003Ccode>@Data\n@Builder\n@TableName("t_user")\npublic class User {\n    private Long id;\n    @TableId(type = IdType.ASSIGN_ID)\n    private Long userId;\n    private String name;\n    private Integer age;\n    private Integer gender;\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>新建 Mapper\u003C\u002Fh3>\n\u003Cp>在项目的 \u003Ccode>mapper\u003C\u002Fcode> 包下，新建 \u003Ccode>UserMapper\u003C\u002Fcode> 接口：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>public interface UserMapper extends BaseMapper<User> {\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>单元测试\u003C\u002Fh3>\n\u003Cp>完成上面的前制工作后，我们新建单元测试，测试一下动态表名是否生效。\u003C\u002Fp>\n\u003Ch4>添加数据\u003C\u002Fh4>\n\u003Cpre>\u003Ccode>    @Test\n    void testInsert() {\n        \u002F\u002F 此用户 ID 取模（模3）等于 0，应存于 t_user_0 表中\n        Long userId = Long.valueOf("1616332498055258115");\n        \u002F\u002F 传递动态表名所需参数\n        RequestDataHelper.setRequestData(new HashMap<String, Object>() {{\n            put("user_id", userId);\n        }});\n\n        User user = User.builder().name("张三").age(30).gender(1).build();\n        userMapper.insert(user);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167541335473089-MLAW.jpg\" loading=\"lazy\" title=\"Mybatis Plus 插入数据（动态表名）\" alt=\"Mybatis Plus 插入数据（动态表名）\">\u003Cspan class=\"image-caption\">Mybatis Plus 插入数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Cp>可以看到，实际将数据存到了 \u003Ccode>t_user_0\u003C\u002Fcode> 表中，这说明动态表名插件生效了，并且按照代码定义的，对 \u003Ccode>user_id\u003C\u002Fcode> 进行了取模（模 3）。\u003C\u002Fp>\n\u003Ch4>查询数据\u003C\u002Fh4>\n\u003Cpre>\u003Ccode>    @Test\n    void testSelectUser() {\n        \u002F\u002F 传递动态表名所需参数, 对此用户 ID 进行模 3，结果为 1，应从 t_user_1 表中查询\n        RequestDataHelper.setRequestData(new HashMap<String, Object>() {{\n            put("user_id", 1616332498571157505L);\n        }});\n\n        QueryWrapper<User> wrapper = new QueryWrapper<>();\n        wrapper.lambda().eq(User::getUserId, 1616332498571157505L);\n        User user = userMapper.selectOne(wrapper);\n        System.out.println(user);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行该单元测试，实际执行 SQL 如下，完美，一切正常工作：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167541392825890-TJiI.jpg\" loading=\"lazy\" title=\"Mybatis Plus 查询数据（动态表名）\" alt=\"Mybatis Plus 查询数据（动态表名）\">\u003Cspan class=\"image-caption\">Mybatis Plus 查询数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Ch2>结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了如何在 Mybatis Plus 中实现动态表名，此功能通常会被应用于数据库分表场景中，希望通过对本文的学习，能对小伙伴们有所帮助！\u003C\u002Fp>\n13:Tf7c1,\u003Ch2 id=\"toc-0\">前言\u003C\u002Fh2>\n\u003Cp>\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何在 Mybatis Plus 中实现动态表名。*啥是动态表名呢？*我们都知道，当数据库单表存储数据太多时（比如单表超过 1000 万条数据），会严重影响查询效率，这就需要进行水平切分操作，将数据分别存储到不同表中。\u003C\u002Fp>\n\u003Cp>举个栗子，假设某个产品预估将会增长到 3000 万用户，开发人员在设计阶段对用户表进行了分表，创建了 3 张表，通过用户 ID 进行模 3 操作，将数据均匀的存放到这 3 张表中，那么，在代码层处理时，需要动态生成表名。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">数据库表与数据\u003C\u002Fh2>\n\u003Cp>为了演示，先新建三张用户表 \u003Ccode>t_user_0\u003C\u002Fcode> 、 \u003Ccode>t_user_1\u003C\u002Fcode>  和 \u003Ccode>t_user_2\u003C\u002Fcode> ，并通过 \u003Ccode>user_id\u003C\u002Fcode> 字段进行取模存储：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167420281572597-bWCR.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>建表语句如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"CREATE%20TABLE%20%60t_user_0%60%20(%0A%20%20%60id%60%20bigint(20)%20unsigned%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E8%87%AA%E5%A2%9EID'%2C%0A%20%20%60user_id%60%20bigint(20)%20unsigned%20NOT%20NULL%20COMMENT%20'%E7%94%A8%E6%88%B7ID%EF%BC%88%E4%B8%BB%E9%94%AE%EF%BC%89'%2C%0A%20%20%60name%60%20varchar(30)%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%20'0'%20COMMENT%20'%E6%80%A7%E5%88%AB%EF%BC%8C0%EF%BC%9A%E5%A5%B3%201%EF%BC%9A%E7%94%B7'%2C%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A%0ACREATE%20TABLE%20%60t_user_1%60%20(%0A%20%20%60id%60%20bigint(20)%20unsigned%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E8%87%AA%E5%A2%9EID'%2C%0A%20%20%60user_id%60%20bigint(20)%20unsigned%20NOT%20NULL%20COMMENT%20'%E7%94%A8%E6%88%B7ID%EF%BC%88%E4%B8%BB%E9%94%AE%EF%BC%89'%2C%0A%20%20%60name%60%20varchar(30)%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%20'0'%20COMMENT%20'%E6%80%A7%E5%88%AB%EF%BC%8C0%EF%BC%9A%E5%A5%B3%201%EF%BC%9A%E7%94%B7'%2C%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A%0ACREATE%20TABLE%20%60t_user_2%60%20(%0A%20%20%60id%60%20bigint(20)%20unsigned%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E8%87%AA%E5%A2%9EID'%2C%0A%20%20%60user_id%60%20bigint(20)%20unsigned%20NOT%20NULL%20COMMENT%20'%E7%94%A8%E6%88%B7ID%EF%BC%88%E4%B8%BB%E9%94%AE%EF%BC%89'%2C%0A%20%20%60name%60%20varchar(30)%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%20'0'%20COMMENT%20'%E6%80%A7%E5%88%AB%EF%BC%8C0%EF%BC%9A%E5%A5%B3%201%EF%BC%9A%E7%94%B7'%2C%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-sql\">\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user_0\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">AUTO_INCREMENT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'自增ID'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>user_id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'用户ID（主键）'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">varchar\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">'0'\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'性别，0：女 1：男'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token string\">'用户表'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user_1\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">AUTO_INCREMENT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'自增ID'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>user_id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'用户ID（主键）'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">varchar\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">'0'\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'性别，0：女 1：男'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token string\">'用户表'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user_2\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">AUTO_INCREMENT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'自增ID'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>user_id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'用户ID（主键）'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">varchar\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">'0'\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'性别，0：女 1：男'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token string\">'用户表'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>注意，因为水平分表的缘故，为了保证注解的唯一性，所以三张表的实际主键为 \u003Ccode>user_id\u003C\u002Fcode> 字段，在插入数据时，通过对用户 ID 取模（userId % 3）将数据放到对应的表中。\u003C\u002Fp>\n\u003Cp>接下来，分别向 3 张表中插入几条测试数据：\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"INSERT%20INTO%20%60t_user_0%60%20(%60id%60%2C%20%60user_id%60%2C%20%60name%60%2C%20%60age%60%2C%20%60gender%60)%0AVALUES%0A%20(1%2C%201616332498122366978%2C%20'%E5%BC%A0%E4%B8%89'%2C%2030%2C%201)%3B%0A%0AINSERT%20INTO%20%60t_user_1%60%20(%60id%60%2C%20%60user_id%60%2C%20%60name%60%2C%20%60age%60%2C%20%60gender%60)%0AVALUES%0A%20(1%2C%201616332498571157505%2C%20'%E5%BC%A0%E4%B8%89'%2C%2030%2C%201)%3B%0A%0AINSERT%20INTO%20%60t_user_2%60%20(%60id%60%2C%20%60user_id%60%2C%20%60name%60%2C%20%60age%60%2C%20%60gender%60)%0AVALUES%0A%20(1%2C%201616332498319499266%2C%20'%E5%BC%A0%E4%B8%89'%2C%2020%2C%201)%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">\u003Cspan class=\"token constant\">INSERT\u003C\u002Fspan> \u003Cspan class=\"token constant\">INTO\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">t_user_0\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">user_id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">name\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">age\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">gender\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token constant\">VALUES\u003C\u002Fspan>\n \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1616332498122366978\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">'张三'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token constant\">INSERT\u003C\u002Fspan> \u003Cspan class=\"token constant\">INTO\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">t_user_1\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">user_id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">name\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">age\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">gender\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token constant\">VALUES\u003C\u002Fspan>\n \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1616332498571157505\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">'张三'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token constant\">INSERT\u003C\u002Fspan> \u003Cspan class=\"token constant\">INTO\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">t_user_2\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">user_id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">name\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">age\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">gender\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token constant\">VALUES\u003C\u002Fspan>\n \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1616332498319499266\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">'张三'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch2 id=\"toc-2\">开始\u003C\u002Fh2>\n\u003Cp>数据准备好了以后，新建一个 Spring Boot 示例工程。\u003C\u002Fp>\n\u003Ch3 id=\"toc-3\">示例工程结构\u003C\u002Fh3>\n\u003Cp>先放一张工程结构的截图，后续会一一创建每个类：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167420290798353-EVvQ.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Ch3 id=\"toc-4\">添加依赖\u003C\u002Fh3>\n\u003Cp>在 Maven 的 \u003Ccode>pom.xml\u003C\u002Fcode> 配置文件中，添加如下依赖：\u003C\u002Fp>\n\u003Cdiv class=\"language-xml\" data-ext=\"xml\" data-code=\"%20%20%20%20%20%20%20%20%3C!--%20lombok%EF%BC%8C%E5%85%8D%E5%86%99%E7%B9%81%E7%90%90%E7%9A%84%20get%2Fset%20%E7%AD%89%E6%96%B9%E6%B3%95%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Eorg.projectlombok%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Elombok%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Coptional%3Etrue%3C%2Foptional%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%20%20%20%20%20%20%20%20%3C!--%20%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Eorg.springframework.boot%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Espring-boot-starter-test%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Cscope%3Etest%3C%2Fscope%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%0A%20%20%20%20%20%20%20%20%3C!--%20mybatis-plus%20%E4%BE%9D%E8%B5%96%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Ecom.baomidou%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Emybatis-plus-boot-starter%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Cversion%3E3.5.2%3C%2Fversion%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%0A%20%20%20%20%20%20%20%20%3C!--%20mysql%20%E4%BE%9D%E8%B5%96%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Emysql%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Emysql-connector-java%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%0A%20%20%20%20%20%20%20%20%3C!--%20p6spy%20%E7%BB%84%E4%BB%B6%EF%BC%8C%E5%8F%AF%E4%BB%A5%E5%AE%8C%E6%95%B4%E6%89%93%E5%8D%B0%E5%AE%9E%E9%99%85%E6%89%A7%E8%A1%8C%20SQL%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Ep6spy%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Ep6spy%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Cversion%3E3.9.1%3C%2Fversion%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-xml\">        \u003Cspan class=\"token comment\"><!-- lombok，免写繁琐的 get\u002Fset 等方法 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>org.projectlombok\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>lombok\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>optional\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>true\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>optional\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\"><!-- 单元测试 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>org.springframework.boot\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>spring-boot-starter-test\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>scope\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>test\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>scope\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\n        \u003Cspan class=\"token comment\"><!-- mybatis-plus 依赖 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>com.baomidou\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>mybatis-plus-boot-starter\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>3.5.2\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\n        \u003Cspan class=\"token comment\"><!-- mysql 依赖 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>mysql\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>mysql-connector-java\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\n        \u003Cspan class=\"token comment\"><!-- p6spy 组件，可以完整打印实际执行 SQL -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>p6spy\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>p6spy\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>3.9.1\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-5\">yml 配置\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>application.yml\u003C\u002Fcode> 文件中添加数据库相关配置：\u003C\u002Fp>\n\u003Cdiv class=\"language-yml\" data-ext=\"yml\" data-code=\"spring%3A%0A%20%20datasource%3A%0A%20%20%20%20driver-class-name%3A%20com.p6spy.engine.spy.P6SpyDriver%0A%20%20%20%20url%3A%20jdbc%3Ap6spy%3Amysql%3A%2F%2F127.0.0.1%3A3306%2Fmaster_db%3FcharacterEncoding%3Dutf-8%0A%20%20%20%20username%3A%20root%0A%20%20%20%20password%3A%20123456%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-yml\">\u003Cspan class=\"token key atrule\">spring\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>\n  \u003Cspan class=\"token key atrule\">datasource\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>\n    \u003Cspan class=\"token key atrule\">driver-class-name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> com.p6spy.engine.spy.P6SpyDriver\n    \u003Cspan class=\"token key atrule\">url\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> jdbc\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>p6spy\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>mysql\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>\u002F\u002F127.0.0.1\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>3306\u002Fmaster_db\u003Cspan class=\"token punctuation\">?\u003C\u002Fspan>characterEncoding=utf\u003Cspan class=\"token punctuation\">-\u003C\u002Fspan>\u003Cspan class=\"token number\">8\u003C\u002Fspan>\n    \u003Cspan class=\"token key atrule\">username\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> root\n    \u003Cspan class=\"token key atrule\">password\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> \u003Cspan class=\"token number\">123456\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>TIP : 这里使用到了 \u003Ccode>p6spy\u003C\u002Fcode> 组件，用于打印完整的执行 SQL ，有兴趣的小伙伴可参考下文：\u003C\u002Fp>\n\u003Cp>《Mybatis Plus 打印 SQL 语句（包含执行耗时）》\u003Cspan>\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" style=\"color: #aaa; margin-left: 3px;\" aria-hidden=\"true\" focusable=\"false\" x=\"0px\" y=\"0px\" viewBox=\"0 0 100 100\" width=\"15\" height=\"15\" class=\"icon outbound\">\u003Cpath fill=\"currentColor\" d=\"M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z\">\u003C\u002Fpath> \u003Cpolygon fill=\"currentColor\" points=\"45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9\">\u003C\u002Fpolygon>\u003C\u002Fsvg> \u003Cspan class=\"sr-only\">\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3 id=\"toc-6\">新建参数传递辅助类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下新建 \u003Ccode>RequestDataHelper\u003C\u002Fcode> 类，用于传递动态表名所需参数：\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"%2F**%0A%20*%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%E4%BC%A0%E9%80%92%E8%BE%85%E5%8A%A9%E7%B1%BB%0A%20*%2F%0Apublic%20class%20RequestDataHelper%20%7B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%E5%AD%98%E5%8F%96%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20static%20final%20ThreadLocal%3CMap%3CString%2C%20Object%3E%3E%20REQUEST_DATA%20%3D%20new%20ThreadLocal%3C%3E()%3B%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%AE%BE%E7%BD%AE%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%0A%20%20%20%20%20*%20%40param%20requestData%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%20MAP%20%E5%AF%B9%E8%B1%A1%0A%20%20%20%20%20*%2F%0A%20%20%20%20public%20static%20void%20setRequestData(Map%3CString%2C%20Object%3E%20requestData)%20%7B%0A%20%20%20%20%20%20%20%20REQUEST_DATA.set(requestData)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%8E%B7%E5%8F%96%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%0A%20%20%20%20%20*%20%40param%20param%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%20%40return%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%20MAP%20%E5%AF%B9%E8%B1%A1%0A%20%20%20%20%20*%2F%0A%20%20%20%20public%20static%20%3CT%3E%20T%20getRequestData(String%20param)%20%7B%0A%20%20%20%20%20%20%20%20Map%3CString%2C%20Object%3E%20dataMap%20%3D%20getRequestData()%3B%0A%20%20%20%20%20%20%20%20if%20(CollectionUtils.isNotEmpty(dataMap))%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20return%20(T)%20dataMap.get(param)%3B%0A%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%20%20return%20null%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%8E%B7%E5%8F%96%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%0A%20%20%20%20%20*%20%40return%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%20MAP%20%E5%AF%B9%E8%B1%A1%0A%20%20%20%20%20*%2F%0A%20%20%20%20public%20static%20Map%3CString%2C%20Object%3E%20getRequestData()%20%7B%0A%20%20%20%20%20%20%20%20return%20REQUEST_DATA.get()%3B%0A%20%20%20%20%7D%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">\u003Cspan class=\"token comment\">\u002F**\n * 请求参数传递辅助类\n *\u002F\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">RequestDataHelper\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F**\n     * 请求参数存取\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> final ThreadLocal\u003Cspan class=\"token operator\"><\u003C\u002Fspan>Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>>\u003C\u002Fspan> \u003Cspan class=\"token constant\">REQUEST_DATA\u003C\u002Fspan> \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">ThreadLocal\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 设置请求参数\n     *\n     * @param requestData 请求参数 MAP 对象\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">setRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token parameter\">Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan> requestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token constant\">REQUEST_DATA\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">set\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>requestData\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 获取请求参数\n     *\n     * @param param 请求参数\n     * @return 请求参数 MAP 对象\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> \u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token constant\">T\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> \u003Cspan class=\"token constant\">T\u003C\u002Fspan> \u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token parameter\">String param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan> dataMap \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>CollectionUtils\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotEmpty\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>dataMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token constant\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> dataMap\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">get\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>param\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 获取请求参数\n     *\n     * @return 请求参数 MAP 对象\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan> \u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> \u003Cspan class=\"token constant\">REQUEST_DATA\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">get\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-7\">新建 Mybatis Plus 配置类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下，添加 Mybatis Plus 配置类：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Configuration%0A%40MapperScan(%22com.mashangan.mybatisplusdemo.mapper%22)%0Apublic%20class%20MybatisPlusConfig%20%7B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%B7%BB%E5%8A%A0%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%E6%8F%92%E4%BB%B6%0A%20%20%20%20%20**%2F%0A%20%20%20%20%40Bean%0A%20%20%20%20public%20MybatisPlusInterceptor%20mybatisPlusInterceptor()%20%7B%0A%20%20%20%20%20%20%20%20MybatisPlusInterceptor%20interceptor%20%3D%20new%20MybatisPlusInterceptor()%3B%0A%20%20%20%20%20%20%20%20DynamicTableNameInnerInterceptor%20dynamicTableNameInnerInterceptor%20%3D%20new%20DynamicTableNameInnerInterceptor()%3B%0A%20%20%20%20%20%20%20%20dynamicTableNameInnerInterceptor.setTableNameHandler((sql%2C%20tableName)%20-%3E%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20%2F%2F%20%E8%8E%B7%E5%8F%96%E5%8F%82%E6%95%B0%E6%96%B9%E6%B3%95%0A%20%20%20%20%20%20%20%20%20%20%20%20Map%3CString%2C%20Object%3E%20paramMap%20%3D%20RequestDataHelper.getRequestData()%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20if%20(CollectionUtils.isNotEmpty(paramMap))%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20paramMap.forEach((k%2C%20v)%20-%3E%20System.err.println(k%20%2B%20%22----%22%20%2B%20v))%3B%0A%09%09%09%09%2F%2F%20%E8%8E%B7%E5%8F%96%E4%BC%A0%E9%80%92%E7%9A%84%E5%8F%82%E6%95%B0%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Long%20userId%20%3D%20(Long)%20paramMap.get(%22user_id%22)%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%2F%2F%20%E6%B0%B4%E5%B9%B3%E5%88%86%E8%A1%A8%203%20%E5%BC%A0%EF%BC%8C%E5%AF%B9%20ID%20%E8%BF%9B%E8%A1%8C%E5%8F%96%E6%A8%A1%E5%86%B3%E5%AE%9A%E8%A1%A8%E5%90%8D%E5%90%8E%E7%BC%80%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20String%20tableNameSuffix%20%3D%20%22_%22%20%2B%20userId%20%25%203%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%2F%2F%20%E7%BB%84%E8%A3%85%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20return%20tableName%20%2B%20tableNameSuffix%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20return%20tableName%3B%0A%20%20%20%20%20%20%20%20%7D)%3B%0A%20%20%20%20%20%20%20%20interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor)%3B%0A%20%20%20%20%20%20%20%20%2F%2F%203.4.3.2%20%E4%BD%9C%E5%BA%9F%E8%AF%A5%E6%96%B9%E5%BC%8F%0A%20%20%20%20%20%20%20%20%2F%2F%20dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map)%3B%0A%20%20%20%20%20%20%20%20return%20interceptor%3B%0A%20%20%20%20%7D%0A%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token annotation punctuation\">@Configuration\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@MapperScan\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"com.mashangan.mybatisplusdemo.mapper\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusConfig\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F**\n     * 添加动态表名插件\n     **\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Bean\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusInterceptor\u003C\u002Fspan> \u003Cspan class=\"token function\">mybatisPlusInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">MybatisPlusInterceptor\u003C\u002Fspan> interceptor \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">DynamicTableNameInnerInterceptor\u003C\u002Fspan> dynamicTableNameInnerInterceptor \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">DynamicTableNameInnerInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        dynamicTableNameInnerInterceptor\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">setTableNameHandler\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>sql\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> tableName\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">->\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token comment\">\u002F\u002F 获取参数方法\u003C\u002Fspan>\n            \u003Cspan class=\"token class-name\">Map\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">String\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Object\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> paramMap \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">RequestDataHelper\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n            \u003Cspan class=\"token keyword\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">CollectionUtils\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotEmpty\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>paramMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n                paramMap\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>k\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> v\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">->\u003C\u002Fspan> \u003Cspan class=\"token class-name\">System\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>err\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>k \u003Cspan class=\"token operator\">+\u003C\u002Fspan> \u003Cspan class=\"token string\">\"----\"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> v\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\t\t\t\u003Cspan class=\"token comment\">\u002F\u002F 获取传递的参数\u003C\u002Fspan>\n                \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> userId \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Long\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> paramMap\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">get\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"user_id\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n                \u003Cspan class=\"token comment\">\u002F\u002F 水平分表 3 张，对 ID 进行取模决定表名后缀\u003C\u002Fspan>\n                \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> tableNameSuffix \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"_\"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> userId \u003Cspan class=\"token operator\">%\u003C\u002Fspan> \u003Cspan class=\"token number\">3\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n                \u003Cspan class=\"token comment\">\u002F\u002F 组装动态表名\u003C\u002Fspan>\n                \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> tableName \u003Cspan class=\"token operator\">+\u003C\u002Fspan> tableNameSuffix\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n            \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n            \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> tableName\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        interceptor\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">addInnerInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>dynamicTableNameInnerInterceptor\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 3.4.3.2 作废该方式\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map);\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> interceptor\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>注意\u003C\u002Fstrong>：考虑到项目中可能会添加多个插件，需要注意顺序关系，官方推荐顺序如下：\u003C\u002Fp>\n\u003Cp>多租户插件 -> 动态表名插件 -> 分页插件 -> 乐观锁插件 -> sql 性能规范插件 -> 防止全表更新与删除插件。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3 id=\"toc-8\">新建数据库实体类\u003C\u002Fh3>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Data%0A%40Builder%0A%40TableName(%22t_user%22)%0Apublic%20class%20User%20%7B%0A%20%20%20%20private%20Long%20id%3B%0A%20%20%20%20%40TableId(type%20%3D%20IdType.ASSIGN_ID)%0A%20%20%20%20private%20Long%20userId%3B%0A%20%20%20%20private%20String%20name%3B%0A%20%20%20%20private%20Integer%20age%3B%0A%20%20%20%20private%20Integer%20gender%3B%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token annotation punctuation\">@Data\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@Builder\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@TableName\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"t_user\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> id\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@TableId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>type \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">IdType\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token constant\">ASSIGN_ID\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> userId\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> name\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> age\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> gender\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-9\">新建 Mapper\u003C\u002Fh3>\n\u003Cp>在项目的 \u003Ccode>mapper\u003C\u002Fcode> 包下，新建 \u003Ccode>UserMapper\u003C\u002Fcode> 接口：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"public%20interface%20UserMapper%20extends%20BaseMapper%3CUser%3E%20%7B%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">interface\u003C\u002Fspan> \u003Cspan class=\"token class-name\">UserMapper\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">BaseMapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-10\">单元测试\u003C\u002Fh3>\n\u003Cp>完成上面的前制工作后，我们新建单元测试，测试一下动态表名是否生效。\u003C\u002Fp>\n\u003Ch4 id=\"toc-11\">添加数据\u003C\u002Fh4>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testInsert()%20%7B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%AD%A4%E7%94%A8%E6%88%B7%20ID%20%E5%8F%96%E6%A8%A1%EF%BC%88%E6%A8%A13%EF%BC%89%E7%AD%89%E4%BA%8E%200%EF%BC%8C%E5%BA%94%E5%AD%98%E4%BA%8E%20t_user_0%20%E8%A1%A8%E4%B8%AD%0A%20%20%20%20%20%20%20%20Long%20userId%20%3D%20Long.valueOf(%221616332498055258115%22)%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E4%BC%A0%E9%80%92%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%E6%89%80%E9%9C%80%E5%8F%82%E6%95%B0%0A%20%20%20%20%20%20%20%20RequestDataHelper.setRequestData(new%20HashMap%3CString%2C%20Object%3E()%20%7B%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20put(%22user_id%22%2C%20userId)%3B%0A%20%20%20%20%20%20%20%20%7D%7D)%3B%0A%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder().name(%22%E5%BC%A0%E4%B8%89%22).age(30).gender(1).build()%3B%0A%20%20%20%20%20%20%20%20userMapper.insert(user)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testInsert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 此用户 ID 取模（模3）等于 0，应存于 t_user_0 表中\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> userId \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">valueOf\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"1616332498055258115\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 传递动态表名所需参数\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">RequestDataHelper\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">setRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">HashMap\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">String\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Object\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token function\">put\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"user_id\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> userId\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n        \u003Cspan class=\"token class-name\">User\u003C\u002Fspan> user \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">builder\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">age\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">gender\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">build\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">insert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167541335473089-MLAW.jpg\" loading=\"lazy\" title=\"Mybatis Plus 插入数据（动态表名）\" alt=\"Mybatis Plus 插入数据（动态表名）\">\u003C\u002Fdiv>\u003Cspan class=\"image-caption\">Mybatis Plus 插入数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Cp>可以看到，实际将数据存到了 \u003Ccode>t_user_0\u003C\u002Fcode> 表中，这说明动态表名插件生效了，并且按照代码定义的，对 \u003Ccode>user_id\u003C\u002Fcode> 进行了取模（模 3）。\u003C\u002Fp>\n\u003Ch4 id=\"toc-12\">查询数据\u003C\u002Fh4>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testSelectUser()%20%7B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E4%BC%A0%E9%80%92%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%E6%89%80%E9%9C%80%E5%8F%82%E6%95%B0%2C%20%E5%AF%B9%E6%AD%A4%E7%94%A8%E6%88%B7%20ID%20%E8%BF%9B%E8%A1%8C%E6%A8%A1%203%EF%BC%8C%E7%BB%93%E6%9E%9C%E4%B8%BA%201%EF%BC%8C%E5%BA%94%E4%BB%8E%20t_user_1%20%E8%A1%A8%E4%B8%AD%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%20%20%20%20RequestDataHelper.setRequestData(new%20HashMap%3CString%2C%20Object%3E()%20%7B%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20put(%22user_id%22%2C%201616332498571157505L)%3B%0A%20%20%20%20%20%20%20%20%7D%7D)%3B%0A%0A%20%20%20%20%20%20%20%20QueryWrapper%3CUser%3E%20wrapper%20%3D%20new%20QueryWrapper%3C%3E()%3B%0A%20%20%20%20%20%20%20%20wrapper.lambda().eq(User%3A%3AgetUserId%2C%201616332498571157505L)%3B%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20userMapper.selectOne(wrapper)%3B%0A%20%20%20%20%20%20%20%20System.out.println(user)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">    @Test\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testSelectUser\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 传递动态表名所需参数, 对此用户 ID 进行模 3，结果为 1，应从 t_user_1 表中查询\u003C\u002Fspan>\n        RequestDataHelper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">setRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">HashMap\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token function\">put\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"user_id\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> 1616332498571157505L\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n        QueryWrapper\u003Cspan class=\"token operator\"><\u003C\u002Fspan>User\u003Cspan class=\"token operator\">>\u003C\u002Fspan> wrapper \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">QueryWrapper\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        wrapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">lambda\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">eq\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>User\u003Cspan class=\"token operator\">:\u003C\u002Fspan>\u003Cspan class=\"token operator\">:\u003C\u002Fspan>getUserId\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> 1616332498571157505L\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        User user \u003Cspan class=\"token operator\">=\u003C\u002Fspan> userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">selectOne\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>wrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        System\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行该单元测试，实际执行 SQL 如下，完美，一切正常工作：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167541392825890-TJiI.jpg\" loading=\"lazy\" title=\"Mybatis Plus 查询数据（动态表名）\" alt=\"Mybatis Plus 查询数据（动态表名）\">\u003C\u002Fdiv>\u003Cspan class=\"image-caption\">Mybatis Plus 查询数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Ch2 id=\"toc-13\">结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了如何在 Mybatis Plus 中实现动态表名，此功能通常会被应用于数据库分表场景中，希望通过对本文的学习，能对小伙伴们有所帮助！\u003C\u002Fp>","\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何在 Mybatis Plus 中实现动态表名。*啥是动态表名呢？*我们都知道，当数据库单表存储数据太多时（比如单表超过 1000 万条数据），会严重影响查询效率，这就需要进行水平切分操作，将数据分别存储到不同表中。\u003C\u002Fp>\n\u003Cp>举个栗子，假设某个产品预估将会增长到 3000 万用户，开发人员在设计阶段对用户表进行了分表，创建了 3 张表，通过用户 ID 进行模 3 操作，将数据均匀的存放到这 3 张表中，那么，在代码层处理时，需要动态生成表名。\u003C\u002Fp>\n\u003Ch2>数据库表与数据\u003C\u002Fh2>\n\u003Cp>为了演示，先新建三张用户表 \u003Ccode>t_user_0\u003C\u002Fcode> 、 \u003Ccode>t_user_1\u003C\u002Fcode>  和 \u003Ccode>t_user_2\u003C\u002Fcode> ，并通过 \u003Ccode>user_id\u003C\u002Fcode> 字段进行取模存储：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167420281572597-bWCR.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>建表语句如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>CREATE TABLE `t_user_0` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增ID',\n  `user_id` bigint(20) unsigned NOT NULL COMMENT '用户ID（主键）',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT '0' COMMENT '性别，0：女 1：男',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';\n\nCREATE TABLE `t_user_1` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增ID',\n  `user_id` bigint(20) unsigned NOT NULL COMMENT '用户ID（主键）',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT '0' COMMENT '性别，0：女 1：男',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';\n\nCREATE TABLE `t_user_2` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '自增ID',\n  `user_id` bigint(20) unsigned NOT NULL COMMENT '用户ID（主键）',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT '0' COMMENT '性别，0：女 1：男',\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COMMENT='用户表';\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>注意，因为水平分表的缘故，为了保证注解的唯一性，所以三张表的实际主键为 \u003Ccode>user_id\u003C\u002Fcode> 字段，在插入数据时，通过对用户 ID 取模（userId % 3）将数据放到对应的表中。\u003C\u002Fp>\n\u003Cp>接下来，分别向 3 张表中插入几条测试数据：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>INSERT INTO `t_user_0` (`id`, `user_id`, `name`, `age`, `gender`)\nVALUES\n (1, 1616332498122366978, '张三', 30, 1);\n\nINSERT INTO `t_user_1` (`id`, `user_id`, `name`, `age`, `gender`)\nVALUES\n (1, 1616332498571157505, '张三', 30, 1);\n\nINSERT INTO `t_user_2` (`id`, `user_id`, `name`, `age`, `gender`)\nVALUES\n (1, 1616332498319499266, '张三', 20, 1);\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch2>开始\u003C\u002Fh2>\n\u003Cp>数据准备好了以后，新建一个 Spring Boot 示例工程。\u003C\u002Fp>\n\u003Ch3>示例工程结构\u003C\u002Fh3>\n\u003Cp>先放一张工程结构的截图，后续会一一创建每个类：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167420290798353-EVvQ.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Ch3>添加依赖\u003C\u002Fh3>\n\u003Cp>在 Maven 的 \u003Ccode>pom.xml\u003C\u002Fcode> 配置文件中，添加如下依赖：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>        <!-- lombok，免写繁琐的 get\u002Fset 等方法 -->\n        <dependency>\n            <groupId>org.projectlombok<\u002FgroupId>\n            <artifactId>lombok<\u002FartifactId>\n            <optional>true<\u002Foptional>\n        <\u002Fdependency>\n        <!-- 单元测试 -->\n        <dependency>\n            <groupId>org.springframework.boot<\u002FgroupId>\n            <artifactId>spring-boot-starter-test<\u002FartifactId>\n            <scope>test<\u002Fscope>\n        <\u002Fdependency>\n\n        <!-- mybatis-plus 依赖 -->\n        <dependency>\n            <groupId>com.baomidou<\u002FgroupId>\n            <artifactId>mybatis-plus-boot-starter<\u002FartifactId>\n            <version>3.5.2<\u002Fversion>\n        <\u002Fdependency>\n\n        <!-- mysql 依赖 -->\n        <dependency>\n            <groupId>mysql<\u002FgroupId>\n            <artifactId>mysql-connector-java<\u002FartifactId>\n        <\u002Fdependency>\n\n        <!-- p6spy 组件，可以完整打印实际执行 SQL -->\n        <dependency>\n            <groupId>p6spy<\u002FgroupId>\n            <artifactId>p6spy<\u002FartifactId>\n            <version>3.9.1<\u002Fversion>\n        <\u002Fdependency>\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>yml 配置\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>application.yml\u003C\u002Fcode> 文件中添加数据库相关配置：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-yml\">spring:\n  datasource:\n    driver-class-name: com.p6spy.engine.spy.P6SpyDriver\n    url: jdbc:p6spy:mysql:\u002F\u002F127.0.0.1:3306\u002Fmaster_db?characterEncoding=utf-8\n    username: root\n    password: 123456\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>TIP : 这里使用到了 \u003Ccode>p6spy\u003C\u002Fcode> 组件，用于打印完整的执行 SQL ，有兴趣的小伙伴可参考下文：\u003C\u002Fp>\n\u003Cp>《Mybatis Plus 打印 SQL 语句（包含执行耗时）》\u003Cspan>\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" style=\"color: #aaa; margin-left: 3px;\" aria-hidden=\"true\" focusable=\"false\" x=\"0px\" y=\"0px\" viewBox=\"0 0 100 100\" width=\"15\" height=\"15\" class=\"icon outbound\">\u003Cpath fill=\"currentColor\" d=\"M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z\">\u003C\u002Fpath> \u003Cpolygon fill=\"currentColor\" points=\"45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9\">\u003C\u002Fpolygon>\u003C\u002Fsvg> \u003Cspan class=\"sr-only\">\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3>新建参数传递辅助类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下新建 \u003Ccode>RequestDataHelper\u003C\u002Fcode> 类，用于传递动态表名所需参数：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>\u002F**\n * 请求参数传递辅助类\n *\u002F\npublic class RequestDataHelper {\n    \u002F**\n     * 请求参数存取\n     *\u002F\n    private static final ThreadLocal<Map<String, Object>> REQUEST_DATA = new ThreadLocal<>();\n\n    \u002F**\n     * 设置请求参数\n     *\n     * @param requestData 请求参数 MAP 对象\n     *\u002F\n    public static void setRequestData(Map<String, Object> requestData) {\n        REQUEST_DATA.set(requestData);\n    }\n\n    \u002F**\n     * 获取请求参数\n     *\n     * @param param 请求参数\n     * @return 请求参数 MAP 对象\n     *\u002F\n    public static <T> T getRequestData(String param) {\n        Map<String, Object> dataMap = getRequestData();\n        if (CollectionUtils.isNotEmpty(dataMap)) {\n            return (T) dataMap.get(param);\n        }\n        return null;\n    }\n\n    \u002F**\n     * 获取请求参数\n     *\n     * @return 请求参数 MAP 对象\n     *\u002F\n    public static Map<String, Object> getRequestData() {\n        return REQUEST_DATA.get();\n    }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>新建 Mybatis Plus 配置类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下，添加 Mybatis Plus 配置类：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@Configuration\n@MapperScan("com.mashangan.mybatisplusdemo.mapper")\npublic class MybatisPlusConfig {\n    \u002F**\n     * 添加动态表名插件\n     **\u002F\n    @Bean\n    public MybatisPlusInterceptor mybatisPlusInterceptor() {\n        MybatisPlusInterceptor interceptor = new MybatisPlusInterceptor();\n        DynamicTableNameInnerInterceptor dynamicTableNameInnerInterceptor = new DynamicTableNameInnerInterceptor();\n        dynamicTableNameInnerInterceptor.setTableNameHandler((sql, tableName) -> {\n            \u002F\u002F 获取参数方法\n            Map<String, Object> paramMap = RequestDataHelper.getRequestData();\n            if (CollectionUtils.isNotEmpty(paramMap)) {\n                paramMap.forEach((k, v) -> System.err.println(k + "----" + v));\n\t\t\t\t\u002F\u002F 获取传递的参数\n                Long userId = (Long) paramMap.get("user_id");\n                \u002F\u002F 水平分表 3 张，对 ID 进行取模决定表名后缀\n                String tableNameSuffix = "_" + userId % 3;\n                \u002F\u002F 组装动态表名\n                return tableName + tableNameSuffix;\n            }\n            return tableName;\n        });\n        interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor);\n        \u002F\u002F 3.4.3.2 作废该方式\n        \u002F\u002F dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map);\n        return interceptor;\n    }\n\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>注意\u003C\u002Fstrong>：考虑到项目中可能会添加多个插件，需要注意顺序关系，官方推荐顺序如下：\u003C\u002Fp>\n\u003Cp>多租户插件 -> 动态表名插件 -> 分页插件 -> 乐观锁插件 -> sql 性能规范插件 -> 防止全表更新与删除插件。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3>新建数据库实体类\u003C\u002Fh3>\n\u003Cpre>\u003Ccode>@Data\n@Builder\n@TableName("t_user")\npublic class User {\n    private Long id;\n    @TableId(type = IdType.ASSIGN_ID)\n    private Long userId;\n    private String name;\n    private Integer age;\n    private Integer gender;\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>新建 Mapper\u003C\u002Fh3>\n\u003Cp>在项目的 \u003Ccode>mapper\u003C\u002Fcode> 包下，新建 \u003Ccode>UserMapper\u003C\u002Fcode> 接口：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>public interface UserMapper extends BaseMapper<User> {\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>单元测试\u003C\u002Fh3>\n\u003Cp>完成上面的前制工作后，我们新建单元测试，测试一下动态表名是否生效。\u003C\u002Fp>\n\u003Ch4>添加数据\u003C\u002Fh4>\n\u003Cpre>\u003Ccode>    @Test\n    void testInsert() {\n        \u002F\u002F 此用户 ID 取模（模3）等于 0，应存于 t_user_0 表中\n        Long userId = Long.valueOf("1616332498055258115");\n        \u002F\u002F 传递动态表名所需参数\n        RequestDataHelper.setRequestData(new HashMap<String, Object>() {{\n            put("user_id", userId);\n        }});\n\n        User user = User.builder().name("张三").age(30).gender(1).build();\n        userMapper.insert(user);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167541335473089-MLAW.jpg\" loading=\"lazy\" title=\"Mybatis Plus 插入数据（动态表名）\" alt=\"Mybatis Plus 插入数据（动态表名）\">\u003Cspan class=\"image-caption\">Mybatis Plus 插入数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Cp>可以看到，实际将数据存到了 \u003Ccode>t_user_0\u003C\u002Fcode> 表中，这说明动态表名插件生效了，并且按照代码定义的，对 \u003Ccode>user_id\u003C\u002Fcode> 进行了取模（模 3）。\u003C\u002Fp>\n\u003Ch4>查询数据\u003C\u002Fh4>\n\u003Cpre>\u003Ccode>    @Test\n    void testSelectUser() {\n        \u002F\u002F 传递动态表名所需参数, 对此用户 ID 进行模 3，结果为 1，应从 t_user_1 表中查询\n        RequestDataHelper.setRequestData(new HashMap<String, Object>() {{\n            put("user_id", 1616332498571157505L);\n        }});\n\n        QueryWrapper<User> wrapper = new QueryWrapper<>();\n        wrapper.lambda().eq(User::getUserId, 1616332498571157505L);\n        User user = userMapper.selectOne(wrapper);\n        System.out.println(user);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行该单元测试，实际执行 SQL 如下，完美，一切正常工作：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167541392825890-TJiI.jpg\" loading=\"lazy\" title=\"Mybatis Plus 查询数据（动态表名）\" alt=\"Mybatis Plus 查询数据（动态表名）\">\u003Cspan class=\"image-caption\">Mybatis Plus 查询数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Ch2>结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了如何在 Mybatis Plus 中实现动态表名，此功能通常会被应用于数据库分表场景中，希望通过对本文的学习，能对小伙伴们有所帮助！\u003C\u002Fp>\n13:Tf7c1,\u003Ch2 id=\"toc-0\">前言\u003C\u002Fh2>\n\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何在 Mybatis Plus 中实现动态表名。*啥是动态表名呢？*我们都知道，当数据库单表存储数据太多时（比如单表超过 1000 万条数据），会严重影响查询效率，这就需要进行水平切分操作，将数据分别存储到不同表中。\u003C\u002Fp>\n\u003Cp>举个栗子，假设某个产品预估将会增长到 3000 万用户，开发人员在设计阶段对用户表进行了分表，创建了 3 张表，通过用户 ID 进行模 3 操作，将数据均匀的存放到这 3 张表中，那么，在代码层处理时，需要动态生成表名。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">数据库表与数据\u003C\u002Fh2>\n\u003Cp>为了演示，先新建三张用户表 \u003Ccode>t_user_0\u003C\u002Fcode> 、 \u003Ccode>t_user_1\u003C\u002Fcode>  和 \u003Ccode>t_user_2\u003C\u002Fcode> ，并通过 \u003Ccode>user_id\u003C\u002Fcode> 字段进行取模存储：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167420281572597-bWCR.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>建表语句如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"CREATE%20TABLE%20%60t_user_0%60%20(%0A%20%20%60id%60%20bigint(20)%20unsigned%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E8%87%AA%E5%A2%9EID'%2C%0A%20%20%60user_id%60%20bigint(20)%20unsigned%20NOT%20NULL%20COMMENT%20'%E7%94%A8%E6%88%B7ID%EF%BC%88%E4%B8%BB%E9%94%AE%EF%BC%89'%2C%0A%20%20%60name%60%20varchar(30)%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%20'0'%20COMMENT%20'%E6%80%A7%E5%88%AB%EF%BC%8C0%EF%BC%9A%E5%A5%B3%201%EF%BC%9A%E7%94%B7'%2C%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A%0ACREATE%20TABLE%20%60t_user_1%60%20(%0A%20%20%60id%60%20bigint(20)%20unsigned%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E8%87%AA%E5%A2%9EID'%2C%0A%20%20%60user_id%60%20bigint(20)%20unsigned%20NOT%20NULL%20COMMENT%20'%E7%94%A8%E6%88%B7ID%EF%BC%88%E4%B8%BB%E9%94%AE%EF%BC%89'%2C%0A%20%20%60name%60%20varchar(30)%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%20'0'%20COMMENT%20'%E6%80%A7%E5%88%AB%EF%BC%8C0%EF%BC%9A%E5%A5%B3%201%EF%BC%9A%E7%94%B7'%2C%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A%0ACREATE%20TABLE%20%60t_user_2%60%20(%0A%20%20%60id%60%20bigint(20)%20unsigned%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E8%87%AA%E5%A2%9EID'%2C%0A%20%20%60user_id%60%20bigint(20)%20unsigned%20NOT%20NULL%20COMMENT%20'%E7%94%A8%E6%88%B7ID%EF%BC%88%E4%B8%BB%E9%94%AE%EF%BC%89'%2C%0A%20%20%60name%60%20varchar(30)%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%20'0'%20COMMENT%20'%E6%80%A7%E5%88%AB%EF%BC%8C0%EF%BC%9A%E5%A5%B3%201%EF%BC%9A%E7%94%B7'%2C%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-sql\">\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user_0\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">AUTO_INCREMENT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'自增ID'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>user_id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'用户ID（主键）'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">varchar\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">'0'\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'性别，0：女 1：男'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token string\">'用户表'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user_1\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">AUTO_INCREMENT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'自增ID'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>user_id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'用户ID（主键）'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">varchar\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">'0'\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'性别，0：女 1：男'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token string\">'用户表'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user_2\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">AUTO_INCREMENT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'自增ID'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>user_id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">bigint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">unsigned\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'用户ID（主键）'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">varchar\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">'0'\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'性别，0：女 1：男'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token string\">'用户表'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>注意，因为水平分表的缘故，为了保证注解的唯一性，所以三张表的实际主键为 \u003Ccode>user_id\u003C\u002Fcode> 字段，在插入数据时，通过对用户 ID 取模（userId % 3）将数据放到对应的表中。\u003C\u002Fp>\n\u003Cp>接下来，分别向 3 张表中插入几条测试数据：\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"INSERT%20INTO%20%60t_user_0%60%20(%60id%60%2C%20%60user_id%60%2C%20%60name%60%2C%20%60age%60%2C%20%60gender%60)%0AVALUES%0A%20(1%2C%201616332498122366978%2C%20'%E5%BC%A0%E4%B8%89'%2C%2030%2C%201)%3B%0A%0AINSERT%20INTO%20%60t_user_1%60%20(%60id%60%2C%20%60user_id%60%2C%20%60name%60%2C%20%60age%60%2C%20%60gender%60)%0AVALUES%0A%20(1%2C%201616332498571157505%2C%20'%E5%BC%A0%E4%B8%89'%2C%2030%2C%201)%3B%0A%0AINSERT%20INTO%20%60t_user_2%60%20(%60id%60%2C%20%60user_id%60%2C%20%60name%60%2C%20%60age%60%2C%20%60gender%60)%0AVALUES%0A%20(1%2C%201616332498319499266%2C%20'%E5%BC%A0%E4%B8%89'%2C%2020%2C%201)%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">\u003Cspan class=\"token constant\">INSERT\u003C\u002Fspan> \u003Cspan class=\"token constant\">INTO\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">t_user_0\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">user_id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">name\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">age\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">gender\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token constant\">VALUES\u003C\u002Fspan>\n \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1616332498122366978\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">'张三'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token constant\">INSERT\u003C\u002Fspan> \u003Cspan class=\"token constant\">INTO\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">t_user_1\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">user_id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">name\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">age\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">gender\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token constant\">VALUES\u003C\u002Fspan>\n \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1616332498571157505\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">'张三'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n\u003Cspan class=\"token constant\">INSERT\u003C\u002Fspan> \u003Cspan class=\"token constant\">INTO\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">t_user_2\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">user_id\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">name\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">age\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token template-string\">\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003Cspan class=\"token string\">gender\u003C\u002Fspan>\u003Cspan class=\"token template-punctuation string\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token constant\">VALUES\u003C\u002Fspan>\n \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1616332498319499266\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">'张三'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch2 id=\"toc-2\">开始\u003C\u002Fh2>\n\u003Cp>数据准备好了以后，新建一个 Spring Boot 示例工程。\u003C\u002Fp>\n\u003Ch3 id=\"toc-3\">示例工程结构\u003C\u002Fh3>\n\u003Cp>先放一张工程结构的截图，后续会一一创建每个类：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167420290798353-EVvQ.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Ch3 id=\"toc-4\">添加依赖\u003C\u002Fh3>\n\u003Cp>在 Maven 的 \u003Ccode>pom.xml\u003C\u002Fcode> 配置文件中，添加如下依赖：\u003C\u002Fp>\n\u003Cdiv class=\"language-xml\" data-ext=\"xml\" data-code=\"%20%20%20%20%20%20%20%20%3C!--%20lombok%EF%BC%8C%E5%85%8D%E5%86%99%E7%B9%81%E7%90%90%E7%9A%84%20get%2Fset%20%E7%AD%89%E6%96%B9%E6%B3%95%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Eorg.projectlombok%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Elombok%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Coptional%3Etrue%3C%2Foptional%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%20%20%20%20%20%20%20%20%3C!--%20%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Eorg.springframework.boot%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Espring-boot-starter-test%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Cscope%3Etest%3C%2Fscope%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%0A%20%20%20%20%20%20%20%20%3C!--%20mybatis-plus%20%E4%BE%9D%E8%B5%96%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Ecom.baomidou%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Emybatis-plus-boot-starter%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Cversion%3E3.5.2%3C%2Fversion%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%0A%20%20%20%20%20%20%20%20%3C!--%20mysql%20%E4%BE%9D%E8%B5%96%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Emysql%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Emysql-connector-java%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A%0A%20%20%20%20%20%20%20%20%3C!--%20p6spy%20%E7%BB%84%E4%BB%B6%EF%BC%8C%E5%8F%AF%E4%BB%A5%E5%AE%8C%E6%95%B4%E6%89%93%E5%8D%B0%E5%AE%9E%E9%99%85%E6%89%A7%E8%A1%8C%20SQL%20--%3E%0A%20%20%20%20%20%20%20%20%3Cdependency%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CgroupId%3Ep6spy%3C%2FgroupId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3CartifactId%3Ep6spy%3C%2FartifactId%3E%0A%20%20%20%20%20%20%20%20%20%20%20%20%3Cversion%3E3.9.1%3C%2Fversion%3E%0A%20%20%20%20%20%20%20%20%3C%2Fdependency%3E%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-xml\">        \u003Cspan class=\"token comment\"><!-- lombok，免写繁琐的 get\u002Fset 等方法 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>org.projectlombok\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>lombok\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>optional\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>true\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>optional\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token 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tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>spring-boot-starter-test\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>scope\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>test\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>scope\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\n        \u003Cspan class=\"token comment\"><!-- mybatis-plus 依赖 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>com.baomidou\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>mybatis-plus-boot-starter\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>3.5.2\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\n        \u003Cspan class=\"token comment\"><!-- mysql 依赖 -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>mysql\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>mysql-connector-java\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\n        \u003Cspan class=\"token comment\"><!-- p6spy 组件，可以完整打印实际执行 SQL -->\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>p6spy\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>groupId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>p6spy\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>artifactId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n            \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>3.9.1\u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n        \u003Cspan class=\"token tag\">\u003Cspan class=\"token tag\">\u003Cspan class=\"token punctuation\"><\u002F\u003C\u002Fspan>dependency\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-5\">yml 配置\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>application.yml\u003C\u002Fcode> 文件中添加数据库相关配置：\u003C\u002Fp>\n\u003Cdiv class=\"language-yml\" data-ext=\"yml\" data-code=\"spring%3A%0A%20%20datasource%3A%0A%20%20%20%20driver-class-name%3A%20com.p6spy.engine.spy.P6SpyDriver%0A%20%20%20%20url%3A%20jdbc%3Ap6spy%3Amysql%3A%2F%2F127.0.0.1%3A3306%2Fmaster_db%3FcharacterEncoding%3Dutf-8%0A%20%20%20%20username%3A%20root%0A%20%20%20%20password%3A%20123456%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-yml\">\u003Cspan class=\"token key atrule\">spring\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>\n  \u003Cspan class=\"token key atrule\">datasource\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>\n    \u003Cspan class=\"token key atrule\">driver-class-name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> com.p6spy.engine.spy.P6SpyDriver\n    \u003Cspan class=\"token key atrule\">url\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> jdbc\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>p6spy\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>mysql\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>\u002F\u002F127.0.0.1\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan>3306\u002Fmaster_db\u003Cspan class=\"token punctuation\">?\u003C\u002Fspan>characterEncoding=utf\u003Cspan class=\"token punctuation\">-\u003C\u002Fspan>\u003Cspan class=\"token number\">8\u003C\u002Fspan>\n    \u003Cspan class=\"token key atrule\">username\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> root\n    \u003Cspan class=\"token key atrule\">password\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> \u003Cspan class=\"token number\">123456\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>TIP : 这里使用到了 \u003Ccode>p6spy\u003C\u002Fcode> 组件，用于打印完整的执行 SQL ，有兴趣的小伙伴可参考下文：\u003C\u002Fp>\n\u003Cp>《Mybatis Plus 打印 SQL 语句（包含执行耗时）》\u003Cspan>\u003Csvg xmlns=\"http:\u002F\u002Fwww.w3.org\u002F2000\u002Fsvg\" style=\"color: #aaa; margin-left: 3px;\" aria-hidden=\"true\" focusable=\"false\" x=\"0px\" y=\"0px\" viewBox=\"0 0 100 100\" width=\"15\" height=\"15\" class=\"icon outbound\">\u003Cpath fill=\"currentColor\" d=\"M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z\">\u003C\u002Fpath> \u003Cpolygon fill=\"currentColor\" points=\"45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9\">\u003C\u002Fpolygon>\u003C\u002Fsvg> \u003Cspan class=\"sr-only\">\u003C\u002Fspan>\u003C\u002Fspan>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3 id=\"toc-6\">新建参数传递辅助类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下新建 \u003Ccode>RequestDataHelper\u003C\u002Fcode> 类，用于传递动态表名所需参数：\u003C\u002Fp>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"%2F**%0A%20*%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%E4%BC%A0%E9%80%92%E8%BE%85%E5%8A%A9%E7%B1%BB%0A%20*%2F%0Apublic%20class%20RequestDataHelper%20%7B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%E5%AD%98%E5%8F%96%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20static%20final%20ThreadLocal%3CMap%3CString%2C%20Object%3E%3E%20REQUEST_DATA%20%3D%20new%20ThreadLocal%3C%3E()%3B%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%AE%BE%E7%BD%AE%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%0A%20%20%20%20%20*%20%40param%20requestData%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%20MAP%20%E5%AF%B9%E8%B1%A1%0A%20%20%20%20%20*%2F%0A%20%20%20%20public%20static%20void%20setRequestData(Map%3CString%2C%20Object%3E%20requestData)%20%7B%0A%20%20%20%20%20%20%20%20REQUEST_DATA.set(requestData)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%8E%B7%E5%8F%96%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%0A%20%20%20%20%20*%20%40param%20param%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%20%40return%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%20MAP%20%E5%AF%B9%E8%B1%A1%0A%20%20%20%20%20*%2F%0A%20%20%20%20public%20static%20%3CT%3E%20T%20getRequestData(String%20param)%20%7B%0A%20%20%20%20%20%20%20%20Map%3CString%2C%20Object%3E%20dataMap%20%3D%20getRequestData()%3B%0A%20%20%20%20%20%20%20%20if%20(CollectionUtils.isNotEmpty(dataMap))%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20return%20(T)%20dataMap.get(param)%3B%0A%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%20%20return%20null%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E8%8E%B7%E5%8F%96%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%0A%20%20%20%20%20*%0A%20%20%20%20%20*%20%40return%20%E8%AF%B7%E6%B1%82%E5%8F%82%E6%95%B0%20MAP%20%E5%AF%B9%E8%B1%A1%0A%20%20%20%20%20*%2F%0A%20%20%20%20public%20static%20Map%3CString%2C%20Object%3E%20getRequestData()%20%7B%0A%20%20%20%20%20%20%20%20return%20REQUEST_DATA.get()%3B%0A%20%20%20%20%7D%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">\u003Cspan class=\"token comment\">\u002F**\n * 请求参数传递辅助类\n *\u002F\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">RequestDataHelper\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F**\n     * 请求参数存取\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> final ThreadLocal\u003Cspan class=\"token operator\"><\u003C\u002Fspan>Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>>\u003C\u002Fspan> \u003Cspan class=\"token constant\">REQUEST_DATA\u003C\u002Fspan> \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">ThreadLocal\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 设置请求参数\n     *\n     * @param requestData 请求参数 MAP 对象\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">setRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token parameter\">Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan> requestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token constant\">REQUEST_DATA\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">set\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>requestData\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 获取请求参数\n     *\n     * @param param 请求参数\n     * @return 请求参数 MAP 对象\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> \u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token constant\">T\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan> \u003Cspan class=\"token constant\">T\u003C\u002Fspan> \u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token parameter\">String param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan> dataMap \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>CollectionUtils\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotEmpty\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>dataMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token constant\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> dataMap\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">get\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>param\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 获取请求参数\n     *\n     * @return 请求参数 MAP 对象\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">static\u003C\u002Fspan> Map\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan> \u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> \u003Cspan class=\"token constant\">REQUEST_DATA\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">get\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-7\">新建 Mybatis Plus 配置类\u003C\u002Fh3>\n\u003Cp>在项目 \u003Ccode>config\u003C\u002Fcode> 包下，添加 Mybatis Plus 配置类：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Configuration%0A%40MapperScan(%22com.mashangan.mybatisplusdemo.mapper%22)%0Apublic%20class%20MybatisPlusConfig%20%7B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%B7%BB%E5%8A%A0%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%E6%8F%92%E4%BB%B6%0A%20%20%20%20%20**%2F%0A%20%20%20%20%40Bean%0A%20%20%20%20public%20MybatisPlusInterceptor%20mybatisPlusInterceptor()%20%7B%0A%20%20%20%20%20%20%20%20MybatisPlusInterceptor%20interceptor%20%3D%20new%20MybatisPlusInterceptor()%3B%0A%20%20%20%20%20%20%20%20DynamicTableNameInnerInterceptor%20dynamicTableNameInnerInterceptor%20%3D%20new%20DynamicTableNameInnerInterceptor()%3B%0A%20%20%20%20%20%20%20%20dynamicTableNameInnerInterceptor.setTableNameHandler((sql%2C%20tableName)%20-%3E%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20%2F%2F%20%E8%8E%B7%E5%8F%96%E5%8F%82%E6%95%B0%E6%96%B9%E6%B3%95%0A%20%20%20%20%20%20%20%20%20%20%20%20Map%3CString%2C%20Object%3E%20paramMap%20%3D%20RequestDataHelper.getRequestData()%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20if%20(CollectionUtils.isNotEmpty(paramMap))%20%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20paramMap.forEach((k%2C%20v)%20-%3E%20System.err.println(k%20%2B%20%22----%22%20%2B%20v))%3B%0A%09%09%09%09%2F%2F%20%E8%8E%B7%E5%8F%96%E4%BC%A0%E9%80%92%E7%9A%84%E5%8F%82%E6%95%B0%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20Long%20userId%20%3D%20(Long)%20paramMap.get(%22user_id%22)%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%2F%2F%20%E6%B0%B4%E5%B9%B3%E5%88%86%E8%A1%A8%203%20%E5%BC%A0%EF%BC%8C%E5%AF%B9%20ID%20%E8%BF%9B%E8%A1%8C%E5%8F%96%E6%A8%A1%E5%86%B3%E5%AE%9A%E8%A1%A8%E5%90%8D%E5%90%8E%E7%BC%80%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20String%20tableNameSuffix%20%3D%20%22_%22%20%2B%20userId%20%25%203%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%2F%2F%20%E7%BB%84%E8%A3%85%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20return%20tableName%20%2B%20tableNameSuffix%3B%0A%20%20%20%20%20%20%20%20%20%20%20%20%7D%0A%20%20%20%20%20%20%20%20%20%20%20%20return%20tableName%3B%0A%20%20%20%20%20%20%20%20%7D)%3B%0A%20%20%20%20%20%20%20%20interceptor.addInnerInterceptor(dynamicTableNameInnerInterceptor)%3B%0A%20%20%20%20%20%20%20%20%2F%2F%203.4.3.2%20%E4%BD%9C%E5%BA%9F%E8%AF%A5%E6%96%B9%E5%BC%8F%0A%20%20%20%20%20%20%20%20%2F%2F%20dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map)%3B%0A%20%20%20%20%20%20%20%20return%20interceptor%3B%0A%20%20%20%20%7D%0A%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token annotation punctuation\">@Configuration\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@MapperScan\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"com.mashangan.mybatisplusdemo.mapper\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusConfig\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F**\n     * 添加动态表名插件\n     **\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Bean\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusInterceptor\u003C\u002Fspan> \u003Cspan class=\"token function\">mybatisPlusInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">MybatisPlusInterceptor\u003C\u002Fspan> interceptor \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">DynamicTableNameInnerInterceptor\u003C\u002Fspan> dynamicTableNameInnerInterceptor \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">DynamicTableNameInnerInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        dynamicTableNameInnerInterceptor\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">setTableNameHandler\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>sql\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> tableName\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">->\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token comment\">\u002F\u002F 获取参数方法\u003C\u002Fspan>\n            \u003Cspan class=\"token class-name\">Map\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">String\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Object\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> paramMap \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">RequestDataHelper\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">getRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n            \u003Cspan class=\"token keyword\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">CollectionUtils\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotEmpty\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>paramMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n                paramMap\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>k\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> v\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">->\u003C\u002Fspan> \u003Cspan class=\"token class-name\">System\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>err\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>k \u003Cspan class=\"token operator\">+\u003C\u002Fspan> \u003Cspan class=\"token string\">\"----\"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> v\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\t\t\t\u003Cspan class=\"token comment\">\u002F\u002F 获取传递的参数\u003C\u002Fspan>\n                \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> userId \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Long\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> paramMap\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">get\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"user_id\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n                \u003Cspan class=\"token comment\">\u002F\u002F 水平分表 3 张，对 ID 进行取模决定表名后缀\u003C\u002Fspan>\n                \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> tableNameSuffix \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"_\"\u003C\u002Fspan> \u003Cspan class=\"token operator\">+\u003C\u002Fspan> userId \u003Cspan class=\"token operator\">%\u003C\u002Fspan> \u003Cspan class=\"token number\">3\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n                \u003Cspan class=\"token comment\">\u002F\u002F 组装动态表名\u003C\u002Fspan>\n                \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> tableName \u003Cspan class=\"token operator\">+\u003C\u002Fspan> tableNameSuffix\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n            \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n            \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> tableName\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        interceptor\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">addInnerInterceptor\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>dynamicTableNameInnerInterceptor\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 3.4.3.2 作废该方式\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F dynamicTableNameInnerInterceptor.setTableNameHandlerMap(map);\u003C\u002Fspan>\n        \u003Cspan class=\"token keyword\">return\u003C\u002Fspan> interceptor\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>注意\u003C\u002Fstrong>：考虑到项目中可能会添加多个插件，需要注意顺序关系，官方推荐顺序如下：\u003C\u002Fp>\n\u003Cp>多租户插件 -> 动态表名插件 -> 分页插件 -> 乐观锁插件 -> sql 性能规范插件 -> 防止全表更新与删除插件。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch3 id=\"toc-8\">新建数据库实体类\u003C\u002Fh3>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Data%0A%40Builder%0A%40TableName(%22t_user%22)%0Apublic%20class%20User%20%7B%0A%20%20%20%20private%20Long%20id%3B%0A%20%20%20%20%40TableId(type%20%3D%20IdType.ASSIGN_ID)%0A%20%20%20%20private%20Long%20userId%3B%0A%20%20%20%20private%20String%20name%3B%0A%20%20%20%20private%20Integer%20age%3B%0A%20%20%20%20private%20Integer%20gender%3B%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token annotation punctuation\">@Data\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@Builder\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@TableName\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"t_user\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> id\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@TableId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>type \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">IdType\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token constant\">ASSIGN_ID\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> userId\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> name\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> age\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> gender\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-9\">新建 Mapper\u003C\u002Fh3>\n\u003Cp>在项目的 \u003Ccode>mapper\u003C\u002Fcode> 包下，新建 \u003Ccode>UserMapper\u003C\u002Fcode> 接口：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"public%20interface%20UserMapper%20extends%20BaseMapper%3CUser%3E%20%7B%0A%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">\u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">interface\u003C\u002Fspan> \u003Cspan class=\"token class-name\">UserMapper\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">BaseMapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-10\">单元测试\u003C\u002Fh3>\n\u003Cp>完成上面的前制工作后，我们新建单元测试，测试一下动态表名是否生效。\u003C\u002Fp>\n\u003Ch4 id=\"toc-11\">添加数据\u003C\u002Fh4>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testInsert()%20%7B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%AD%A4%E7%94%A8%E6%88%B7%20ID%20%E5%8F%96%E6%A8%A1%EF%BC%88%E6%A8%A13%EF%BC%89%E7%AD%89%E4%BA%8E%200%EF%BC%8C%E5%BA%94%E5%AD%98%E4%BA%8E%20t_user_0%20%E8%A1%A8%E4%B8%AD%0A%20%20%20%20%20%20%20%20Long%20userId%20%3D%20Long.valueOf(%221616332498055258115%22)%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E4%BC%A0%E9%80%92%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%E6%89%80%E9%9C%80%E5%8F%82%E6%95%B0%0A%20%20%20%20%20%20%20%20RequestDataHelper.setRequestData(new%20HashMap%3CString%2C%20Object%3E()%20%7B%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20put(%22user_id%22%2C%20userId)%3B%0A%20%20%20%20%20%20%20%20%7D%7D)%3B%0A%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder().name(%22%E5%BC%A0%E4%B8%89%22).age(30).gender(1).build()%3B%0A%20%20%20%20%20%20%20%20userMapper.insert(user)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testInsert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 此用户 ID 取模（模3）等于 0，应存于 t_user_0 表中\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan> userId \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Long\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">valueOf\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"1616332498055258115\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 传递动态表名所需参数\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">RequestDataHelper\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">setRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">HashMap\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">String\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Object\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token function\">put\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"user_id\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> userId\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n        \u003Cspan class=\"token class-name\">User\u003C\u002Fspan> user \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">builder\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">age\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">gender\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">build\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">insert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167541335473089-MLAW.jpg\" loading=\"lazy\" title=\"Mybatis Plus 插入数据（动态表名）\" alt=\"Mybatis Plus 插入数据（动态表名）\">\u003C\u002Fdiv>\u003Cspan class=\"image-caption\">Mybatis Plus 插入数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Cp>可以看到，实际将数据存到了 \u003Ccode>t_user_0\u003C\u002Fcode> 表中，这说明动态表名插件生效了，并且按照代码定义的，对 \u003Ccode>user_id\u003C\u002Fcode> 进行了取模（模 3）。\u003C\u002Fp>\n\u003Ch4 id=\"toc-12\">查询数据\u003C\u002Fh4>\n\u003Cdiv class=\"language-javascript\" data-ext=\"javascript\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testSelectUser()%20%7B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E4%BC%A0%E9%80%92%E5%8A%A8%E6%80%81%E8%A1%A8%E5%90%8D%E6%89%80%E9%9C%80%E5%8F%82%E6%95%B0%2C%20%E5%AF%B9%E6%AD%A4%E7%94%A8%E6%88%B7%20ID%20%E8%BF%9B%E8%A1%8C%E6%A8%A1%203%EF%BC%8C%E7%BB%93%E6%9E%9C%E4%B8%BA%201%EF%BC%8C%E5%BA%94%E4%BB%8E%20t_user_1%20%E8%A1%A8%E4%B8%AD%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%20%20%20%20RequestDataHelper.setRequestData(new%20HashMap%3CString%2C%20Object%3E()%20%7B%7B%0A%20%20%20%20%20%20%20%20%20%20%20%20put(%22user_id%22%2C%201616332498571157505L)%3B%0A%20%20%20%20%20%20%20%20%7D%7D)%3B%0A%0A%20%20%20%20%20%20%20%20QueryWrapper%3CUser%3E%20wrapper%20%3D%20new%20QueryWrapper%3C%3E()%3B%0A%20%20%20%20%20%20%20%20wrapper.lambda().eq(User%3A%3AgetUserId%2C%201616332498571157505L)%3B%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20userMapper.selectOne(wrapper)%3B%0A%20%20%20%20%20%20%20%20System.out.println(user)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-javascript\">    @Test\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testSelectUser\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 传递动态表名所需参数, 对此用户 ID 进行模 3，结果为 1，应从 t_user_1 表中查询\u003C\u002Fspan>\n        RequestDataHelper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">setRequestData\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">HashMap\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>String\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> Object\u003Cspan class=\"token operator\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n            \u003Cspan class=\"token function\">put\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"user_id\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> 1616332498571157505L\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n        QueryWrapper\u003Cspan class=\"token operator\"><\u003C\u002Fspan>User\u003Cspan class=\"token operator\">>\u003C\u002Fspan> wrapper \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">QueryWrapper\u003C\u002Fspan>\u003Cspan class=\"token operator\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        wrapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">lambda\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">eq\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>User\u003Cspan class=\"token operator\">:\u003C\u002Fspan>\u003Cspan class=\"token operator\">:\u003C\u002Fspan>getUserId\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> 1616332498571157505L\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        User user \u003Cspan class=\"token operator\">=\u003C\u002Fspan> userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">selectOne\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>wrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        System\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行该单元测试，实际执行 SQL 如下，完美，一切正常工作：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167541392825890-TJiI.jpg\" loading=\"lazy\" title=\"Mybatis Plus 查询数据（动态表名）\" alt=\"Mybatis Plus 查询数据（动态表名）\">\u003C\u002Fdiv>\u003Cspan class=\"image-caption\">Mybatis Plus 查询数据（动态表名）\u003C\u002Fspan>\n\u003C\u002Fp>\n\u003Ch2 id=\"toc-13\">结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了如何在 Mybatis Plus 中实现动态表名，此功能通常会被应用于数据库分表场景中，希望通过对本文的学习，能对小伙伴们有所帮助！\u003C\u002Fp>"]