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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":124,"creationTimestamp":125},{"title":127,"slug":128,"cover":129,"excerpt":487,"publishTime":132,"categories":488,"tags":489,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":131,"autoGenerate":93},[87],[],{"permalink":136,"excerpt":137,"lastModifyTime":138,"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>前面小节\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>中，我们已经了解到什么是 Mybatis Plus， 以及和 Mybatis 的区别。本章节中，我们将上手学习如何使用它操作数据库。\u003C\u002Fp>\n\u003Ch2>一、数据库安装\u003C\u002Fh2>\n\u003Cp>本教程以 MySQL 数据库作为演示，所以第一步，你需要先确保你的机器已安装好 MySQL 。不知道如何安装的童鞋，可自行百度一下。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP :  也可以使用 Docker 安装 MySQL 环境，可参考之前的文章：《Docker 安装 MySQL 环境》\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\u003Ch2>二、新建测试库与表\u003C\u002Fh2>\n\u003Cp>MySQL 安装成功后，新建一个名为 \u003Ccode>test\u003C\u002Fcode> 的测试数据库，并创建一张用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>DROP TABLE IF EXISTS t_user;\n\nCREATE TABLE `t_user` (\n  `id` bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '主键ID',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) NULL 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) COMMENT = '用户表';\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch2>三、新建 Spring Boot 示例项目\u003C\u002Fh2>\n\u003Cp>数据库准备好了，我们来新建一个 Spring Boot 示例项目，用来讲解如何使用 Mybatis Plus，先放一张示例项目目录结构截图：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 不懂 Spring Boot 的童鞋，可以参考之前发布的文章：《Spring Boot 入门教程》\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\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F164870371940555-tWiM.png\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>注意 :\u003C\u002Fp>\n\u003Cp>全新的 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 3.0 版本基于 JDK8，提供了 \u003Ccode>lambda\u003C\u002Fcode> 形式的调用，所以安装集成 Mybatis-Plus 3.0 要求如下：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>JDK 8+；\u003C\u002Fli>\n\u003Cli>Maven or Gradle, 本文以 maven 作为版本管理工具；\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fblockquote>\n\u003Ch2>四、添加 Mybatis Plus 依赖\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>pom.xml\u003C\u002Fcode> 文件中添加以下依赖：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-xml\"><!-- mybatis-plus 依赖 -->\n<dependency>\n    <groupId>com.baomidou<\u002FgroupId>\n    <artifactId>mybatis-plus-boot-starter<\u002FartifactId>\n    <version>3.5.1<\u002Fversion>\n<\u002Fdependency>\n\n<!-- 单元测试依赖 -->\n<dependency>\n    <groupId>org.springframework.boot<\u002FgroupId>\n    <artifactId>spring-boot-starter-test<\u002FartifactId>\n    <scope>test<\u002Fscope>\n<\u002Fdependency>\n\n<!-- lombok 依赖（免写 setXXX\u002FgetXXX 方法） -->\n<dependency>\n    <groupId>org.projectlombok<\u002FgroupId>\n    <artifactId>lombok<\u002FartifactId>\n    <version>1.16.10<\u002Fversion>\n<\u002Fdependency>\n\n<!-- mysql 依赖 -->\n<dependency>\n    <groupId>mysql<\u002FgroupId>\n    <artifactId>mysql-connector-java<\u002FartifactId>\n<\u002Fdependency>\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>PS: 在写此教程的时候，MyBatis-Plus 的最新版本为 \u003Ccode>3.5.1\u003C\u002Fcode>。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>警告： 引入 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 之后请不要再次引入 \u003Ccode>MyBatis\u003C\u002Fcode> 以及 \u003Ccode>MyBatis-Spring\u003C\u002Fcode>，以避免因版本差异导致的问题。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>五、添加配置\u003C\u002Fh2>\n\u003Cp>接下来，在 \u003Ccode>applicaiton.yml\u003C\u002Fcode> 配置文件中添加 MySQL 数据库的相关配置（数据库驱动、连接、用户名和密码）：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-yml\"># 数据库配置\nspring:\n  datasource:\n    driver-class-name: com.mysql.cj.jdbc.Driver\n    url: jdbc:mysql:\u002F\u002F127.0.0.1:3306\u002Ftest?characterEncoding=utf-8\n    username: root\n    password: xxxx\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>然后，在项目根目录下新建一个 \u003Ccode>config\u003C\u002Fcode> 包，并创建 \u003Ccode>MybatisPlusConfig\u003C\u002Fcode> 配置类：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>\u002F**\n * @Author: 张三\n * @Date: 2022-12-15 18:29\n * @Version: v1.0.0\n * @Description: TODO\n **\u002F\n@Configuration\n@MapperScan("com.mashangan.mybatisplusdemo.mapper")\npublic class MybatisPlusConfig {\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@MapperScan\u003C\u002Fcode> 注解用于告诉 Mybatis Plus 框架需要扫描的 \u003Ccode>mapper\u003C\u002Fcode> 类的包路径，\u003Ccode>mapper\u003C\u002Fcode> 类主要用于操作数据库，学习过 Mybatis 的童鞋应该都非常清楚，这里提一嘴是防止可能会有些没学过 Mybatis 的小伙伴。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>六、添加实体类\u003C\u002Fh2>\n\u003Cp>前面已经建好了用户表，下面编写用户表对应的数据库实体类 \u003Ccode>User.java\u003C\u002Fcode> :\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">@Data\n@Builder\n@TableName("t_user")\npublic class User {\n    @TableId(type = IdType.AUTO)\n    private Long id;\n    private String name;\n    private Integer age;\n    private Integer gender;\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cul>\n\u003Cli>\u003Ccode>@TableName("t_user")\u003C\u002Fcode> 注解用于指定表名；\u003C\u002Fli>\n\u003Cli>\u003Ccode>@TableId(type = IdType.AUTO)\u003C\u002Fcode> 注解指定了字段 \u003Ccode>id\u003C\u002Fcode> 为表的主键，同时指定主键为自增类型。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP： \u003Ccode>@Data\u003C\u002Fcode> 和 \u003Ccode>@Builder\u003C\u002Fcode> 是 Lombok 注解，偷懒用的，加上它即可编译自动生成 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 等相关方法，不了解的小伙伴可自行搜索一下如何使用。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>七、添加 Mapper 类\u003C\u002Fh2>\n\u003Cp>在项目根目录下创建 \u003Ccode>mapper\u003C\u002Fcode> 包，并新建 \u003Ccode>UserMapper\u003C\u002Fcode>  接口，同时继承自 \u003Ccode>BaseMapper\u003C\u002Fcode>， 代码如下:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">public interface UserMapper extends BaseMapper<User> {\n    \n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>\u003Ccode>BaseMapper\u003C\u002Fcode> 接口由 Mybatis Plus 提供，封装了一些常用的 CRUD 操作，使得我们无需像 Mybatis 那样编写 \u003Ccode>xml\u003C\u002Fcode> 文件，就拥有了基本的 CRUD 功能，点击 \u003Ccode>BaseMapper\u003C\u002Fcode> 接口，源码如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">public interface BaseMapper<T> extends Mapper<T> {\n    \u002F\u002F 新增数据\n    int insert(T entity);\n\t\u002F\u002F 根据 ID 删除\n    int deleteById(Serializable id);\n\t\u002F\u002F 删除数据\n    int deleteByMap(@Param("cm") Map<String, Object> columnMap);\n\t\u002F\u002F 删除数据\n    int delete(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 根据 ID 批量删除数据\n    int deleteBatchIds(@Param("coll") Collection<? extends Serializable> idList);\n\t\u002F\u002F 根据 ID 更新\n    int updateById(@Param("et") T entity);\n\t\u002F\u002F 更新数据\n    int update(@Param("et") T entity, @Param("ew") Wrapper<T> updateWrapper);\n\t\u002F\u002F 根据 ID 查询\n    T selectById(Serializable id);\n\t\u002F\u002F 根据 ID 批量查询\n    List<T> selectBatchIds(@Param("coll") Collection<? extends Serializable> idList);\n\t\u002F\u002F 查询数据\n    List<T> selectByMap(@Param("cm") Map<String, Object> columnMap);\n\t\u002F\u002F 查询一条数据\n    T selectOne(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询记录总数\n    Integer selectCount(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询多条数据\n    List<T> selectList(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询多条数据\n    List<Map<String, Object>> selectMaps(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询多条数据\n    List<Object> selectObjs(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 分页查询\n    <E extends IPage<T>> E selectPage(E page, @Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 分页查询\n    <E extends IPage<Map<String, Object>>> E selectMapsPage(E page, @Param("ew") Wrapper<T> queryWrapper);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>可以先简单看一眼，有个印象就行，后续章节中将学习如何使用它们。\u003C\u002Fp>\n\u003Ch2>八、简单的 CRUD\u003C\u002Fh2>\n\u003Cp>在单元测试包下，创建一个测试类 \u003Ccode>MybatisPlusBaseMapperTests\u003C\u002Fcode>，编写几个 CURD 的测试方法，测试代码如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">@SpringBootTest\nclass MybatisPlusBaseMapperTests {\n\n    @Autowired\n    private UserMapper userMapper;\n\n    \u002F**\n     * 查询数据\n     *\u002F\n    @Test\n    public void testSelectUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 查询数据 ------"));\n        \u002F\u002F  selectList() 方法的参数为 mybatis-plus 内置的条件封装器 Wrapper，这里不填写表示无任何条件，全量查询\n        List<User> userList = userMapper.selectList(null);\n\n        userList.forEach(System.out::println);\n    }\n\n    \u002F**\n     * 新增一条数据\n     *\u002F\n    @Test\n    public void testInsertUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 插入数据 ------"));\n        User user = User.builder()\n                .name("张三")\n                .age(30)\n                .gender(1)\n                .build();\n\n        userMapper.insert(user);\n    }\n\n    \u002F**\n     * 删除数据\n     *\u002F\n    @Test\n    public void testDeleteUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 删除数据 ------"));\n        \u002F\u002F 根据主键删除记录\n        userMapper.deleteById(1);\n\n        \u002F\u002F 根据主键批量删除记录\n        userMapper.deleteBatchIds(Arrays.asList(1, 2));\n    }\n\n    \u002F**\n     * 更新数据\n     *\u002F\n    @Test\n    public void testUpdateUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 更新数据 ------"));\n        User user = User.builder()\n                .id(1L)\n                .name("张三")\n                .build();\n\n        userMapper.updateById(user);\n    }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch2>九、结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了 Spring Boot 中如何快速整合集成 Mybatis-Plus, 同时在本地搭建了一个 MySQL 环境，演示了如何通过 Mybatis-Plus 实现了基本的增删改查操作。\u003C\u002Fp>\n13:Tc793,\u003Cp>\u003C\u002Fp>\n\u003Cp>前面小节\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>中，我们已经了解到什么是 Mybatis Plus， 以及和 Mybatis 的区别。本章节中，我们将上手学习如何使用它操作数据库。\u003C\u002Fp>\n\u003Ch2 id=\"toc-0\">一、数据库安装\u003C\u002Fh2>\n\u003Cp>本教程以 MySQL 数据库作为演示，所以第一步，你需要先确保你的机器已安装好 MySQL 。不知道如何安装的童鞋，可自行百度一下。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP :  也可以使用 Docker 安装 MySQL 环境，可参考之前的文章：《Docker 安装 MySQL 环境》\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\u003Ch2 id=\"toc-1\">二、新建测试库与表\u003C\u002Fh2>\n\u003Cp>MySQL 安装成功后，新建一个名为 \u003Ccode>test\u003C\u002Fcode> 的测试数据库，并创建一张用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"DROP%20TABLE%20IF%20EXISTS%20t_user%3B%0A%0ACREATE%20TABLE%20%60t_user%60%20(%0A%20%20%60id%60%20bigint(20)%20UNSIGNED%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E4%B8%BB%E9%94%AEID'%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)%20NULL%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%200%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)%20COMMENT%20%3D%20'%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\">DROP\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">IF\u003C\u002Fspan> \u003Cspan class=\"token keyword\">EXISTS\u003C\u002Fspan> t_user\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\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\">'主键ID'\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 boolean\">NULL\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 number\">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\">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\u003Ch2 id=\"toc-2\">三、新建 Spring Boot 示例项目\u003C\u002Fh2>\n\u003Cp>数据库准备好了，我们来新建一个 Spring Boot 示例项目，用来讲解如何使用 Mybatis Plus，先放一张示例项目目录结构截图：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 不懂 Spring Boot 的童鞋，可以参考之前发布的文章：《Spring Boot 入门教程》\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\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F164870371940555-tWiM.png\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>注意 :\u003C\u002Fp>\n\u003Cp>全新的 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 3.0 版本基于 JDK8，提供了 \u003Ccode>lambda\u003C\u002Fcode> 形式的调用，所以安装集成 Mybatis-Plus 3.0 要求如下：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>JDK 8+；\u003C\u002Fli>\n\u003Cli>Maven or Gradle, 本文以 maven 作为版本管理工具；\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-3\">四、添加 Mybatis Plus 依赖\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>pom.xml\u003C\u002Fcode> 文件中添加以下依赖：\u003C\u002Fp>\n\u003Cdiv class=\"language-xml\" data-ext=\"xml\" data-code=\"%3C!--%20mybatis-plus%20%E4%BE%9D%E8%B5%96%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Ecom.baomidou%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Emybatis-plus-boot-starter%3C%2FartifactId%3E%0A%20%20%20%20%3Cversion%3E3.5.1%3C%2Fversion%3E%0A%3C%2Fdependency%3E%0A%0A%3C!--%20%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95%E4%BE%9D%E8%B5%96%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Eorg.springframework.boot%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Espring-boot-starter-test%3C%2FartifactId%3E%0A%20%20%20%20%3Cscope%3Etest%3C%2Fscope%3E%0A%3C%2Fdependency%3E%0A%0A%3C!--%20lombok%20%E4%BE%9D%E8%B5%96%EF%BC%88%E5%85%8D%E5%86%99%20setXXX%2FgetXXX%20%E6%96%B9%E6%B3%95%EF%BC%89%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Eorg.projectlombok%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Elombok%3C%2FartifactId%3E%0A%20%20%20%20%3Cversion%3E1.16.10%3C%2Fversion%3E%0A%3C%2Fdependency%3E%0A%0A%3C!--%20mysql%20%E4%BE%9D%E8%B5%96%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Emysql%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Emysql-connector-java%3C%2FartifactId%3E%0A%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\"><!-- 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>3.5.1\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\n\u003Cspan class=\"token comment\"><!-- 单元测试依赖 -->\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>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\"><!-- lombok 依赖（免写 setXXX\u002FgetXXX 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>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>1.16.10\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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>PS: 在写此教程的时候，MyBatis-Plus 的最新版本为 \u003Ccode>3.5.1\u003C\u002Fcode>。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>警告： 引入 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 之后请不要再次引入 \u003Ccode>MyBatis\u003C\u002Fcode> 以及 \u003Ccode>MyBatis-Spring\u003C\u002Fcode>，以避免因版本差异导致的问题。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-4\">五、添加配置\u003C\u002Fh2>\n\u003Cp>接下来，在 \u003Ccode>applicaiton.yml\u003C\u002Fcode> 配置文件中添加 MySQL 数据库的相关配置（数据库驱动、连接、用户名和密码）：\u003C\u002Fp>\n\u003Cdiv class=\"language-yml\" data-ext=\"yml\" data-code=\"%23%20%E6%95%B0%E6%8D%AE%E5%BA%93%E9%85%8D%E7%BD%AE%0Aspring%3A%0A%20%20datasource%3A%0A%20%20%20%20driver-class-name%3A%20com.mysql.cj.jdbc.Driver%0A%20%20%20%20url%3A%20jdbc%3Amysql%3A%2F%2F127.0.0.1%3A3306%2Ftest%3FcharacterEncoding%3Dutf-8%0A%20%20%20%20username%3A%20root%0A%20%20%20%20password%3A%20xxxx%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 comment\"># 数据库配置\u003C\u002Fspan>\n\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.mysql.cj.jdbc.Driver\n    \u003Cspan class=\"token key atrule\">url\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> jdbc\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\u002Ftest\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> xxxx\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>然后，在项目根目录下新建一个 \u003Ccode>config\u003C\u002Fcode> 包，并创建 \u003Ccode>MybatisPlusConfig\u003C\u002Fcode> 配置类：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%2F**%0A%20*%20%40Author%3A%20%E5%BC%A0%E4%B8%89%0A%20*%20%40From%3A%20%E5%85%AC%E4%BC%97%E5%8F%B7%EF%BC%9A%E5%BC%A0%E4%B8%89%2C%20%E7%BD%91%E7%AB%99%EF%BC%9Awww.mashangan.com%0A%20*%20%40Date%3A%202022-12-15%2018%3A29%0A%20*%20%40Version%3A%20v1.0.0%0A%20*%20%40Description%3A%20TODO%0A%20**%2F%0A%40Configuration%0A%40MapperScan(%22com.mashangan.mybatisplusdemo.mapper%22)%0Apublic%20class%20MybatisPlusConfig%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 comment\">\u002F**\n * @Author: 张三\n * @Date: 2022-12-15 18:29\n * @Version: v1.0.0\n * @Description: TODO\n **\u002F\u003C\u002Fspan>\n\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 punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@MapperScan\u003C\u002Fcode> 注解用于告诉 Mybatis Plus 框架需要扫描的 \u003Ccode>mapper\u003C\u002Fcode> 类的包路径，\u003Ccode>mapper\u003C\u002Fcode> 类主要用于操作数据库，学习过 Mybatis 的童鞋应该都非常清楚，这里提一嘴是防止可能会有些没学过 Mybatis 的小伙伴。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-5\">六、添加实体类\u003C\u002Fh2>\n\u003Cp>前面已经建好了用户表，下面编写用户表对应的数据库实体类 \u003Ccode>User.java\u003C\u002Fcode> :\u003C\u002Fp>\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%20%40TableId(type%20%3D%20IdType.AUTO)%0A%20%20%20%20private%20Long%20id%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 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\">AUTO\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 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\u003Cul>\n\u003Cli>\u003Ccode>@TableName("t_user")\u003C\u002Fcode> 注解用于指定表名；\u003C\u002Fli>\n\u003Cli>\u003Ccode>@TableId(type = IdType.AUTO)\u003C\u002Fcode> 注解指定了字段 \u003Ccode>id\u003C\u002Fcode> 为表的主键，同时指定主键为自增类型。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP： \u003Ccode>@Data\u003C\u002Fcode> 和 \u003Ccode>@Builder\u003C\u002Fcode> 是 Lombok 注解，偷懒用的，加上它即可编译自动生成 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 等相关方法，不了解的小伙伴可自行搜索一下如何使用。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-6\">七、添加 Mapper 类\u003C\u002Fh2>\n\u003Cp>在项目根目录下创建 \u003Ccode>mapper\u003C\u002Fcode> 包，并新建 \u003Ccode>UserMapper\u003C\u002Fcode>  接口，同时继承自 \u003Ccode>BaseMapper\u003C\u002Fcode>， 代码如下:\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"public%20interface%20UserMapper%20extends%20BaseMapper%3CUser%3E%20%7B%0A%20%20%20%20%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    \n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>\u003Ccode>BaseMapper\u003C\u002Fcode> 接口由 Mybatis Plus 提供，封装了一些常用的 CRUD 操作，使得我们无需像 Mybatis 那样编写 \u003Ccode>xml\u003C\u002Fcode> 文件，就拥有了基本的 CRUD 功能，点击 \u003Ccode>BaseMapper\u003C\u002Fcode> 接口，源码如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"public%20interface%20BaseMapper%3CT%3E%20extends%20Mapper%3CT%3E%20%7B%0A%20%20%20%20%2F%2F%20%E6%96%B0%E5%A2%9E%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20insert(T%20entity)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E5%88%A0%E9%99%A4%0A%20%20%20%20int%20deleteById(Serializable%20id)%3B%0A%09%2F%2F%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20deleteByMap(%40Param(%22cm%22)%20Map%3CString%2C%20Object%3E%20columnMap)%3B%0A%09%2F%2F%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20delete(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20deleteBatchIds(%40Param(%22coll%22)%20Collection%3C%3F%20extends%20Serializable%3E%20idList)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%9B%B4%E6%96%B0%0A%20%20%20%20int%20updateById(%40Param(%22et%22)%20T%20entity)%3B%0A%09%2F%2F%20%E6%9B%B4%E6%96%B0%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20update(%40Param(%22et%22)%20T%20entity%2C%20%40Param(%22ew%22)%20Wrapper%3CT%3E%20updateWrapper)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%9F%A5%E8%AF%A2%0A%20%20%20%20T%20selectById(Serializable%20id)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%89%B9%E9%87%8F%E6%9F%A5%E8%AF%A2%0A%20%20%20%20List%3CT%3E%20selectBatchIds(%40Param(%22coll%22)%20Collection%3C%3F%20extends%20Serializable%3E%20idList)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CT%3E%20selectByMap(%40Param(%22cm%22)%20Map%3CString%2C%20Object%3E%20columnMap)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E4%B8%80%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20T%20selectOne(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E8%AE%B0%E5%BD%95%E6%80%BB%E6%95%B0%0A%20%20%20%20Integer%20selectCount(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E5%A4%9A%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CT%3E%20selectList(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E5%A4%9A%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CMap%3CString%2C%20Object%3E%3E%20selectMaps(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E5%A4%9A%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CObject%3E%20selectObjs(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E5%88%86%E9%A1%B5%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%3CE%20extends%20IPage%3CT%3E%3E%20E%20selectPage(E%20page%2C%20%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E5%88%86%E9%A1%B5%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%3CE%20extends%20IPage%3CMap%3CString%2C%20Object%3E%3E%3E%20E%20selectMapsPage(E%20page%2C%20%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%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 keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">interface\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\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Mapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F\u002F 新增数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">insert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan> entity\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 删除\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">deleteById\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan> id\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 删除数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">deleteByMap\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"cm\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \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> columnMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 删除数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">delete\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 批量删除数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">deleteBatchIds\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"coll\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Collection\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">?\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> idList\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 更新\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">updateById\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"et\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> entity\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 更新数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">update\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"et\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> entity\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> updateWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 查询\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> \u003Cspan class=\"token function\">selectById\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan> id\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 批量查询\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectBatchIds\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"coll\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Collection\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">?\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> idList\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectByMap\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"cm\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \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> columnMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询一条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> \u003Cspan class=\"token function\">selectOne\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询记录总数\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> \u003Cspan class=\"token function\">selectCount\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询多条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询多条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Map\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectMaps\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询多条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\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 function\">selectObjs\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 分页查询\u003C\u002Fspan>\n    \u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">IPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token function\">selectPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> page\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 分页查询\u003C\u002Fspan>\n    \u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">IPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Map\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token function\">selectMapsPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> page\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\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>可以先简单看一眼，有个印象就行，后续章节中将学习如何使用它们。\u003C\u002Fp>\n\u003Ch2 id=\"toc-7\">八、简单的 CRUD\u003C\u002Fh2>\n\u003Cp>在单元测试包下，创建一个测试类 \u003Ccode>MybatisPlusBaseMapperTests\u003C\u002Fcode>，编写几个 CURD 的测试方法，测试代码如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40SpringBootTest%0Aclass%20MybatisPlusBaseMapperTests%20%7B%0A%0A%20%20%20%20%40Autowired%0A%20%20%20%20private%20UserMapper%20userMapper%3B%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%9F%A5%E8%AF%A2%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testSelectUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E6%9F%A5%E8%AF%A2%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%20selectList()%20%E6%96%B9%E6%B3%95%E7%9A%84%E5%8F%82%E6%95%B0%E4%B8%BA%20mybatis-plus%20%E5%86%85%E7%BD%AE%E7%9A%84%E6%9D%A1%E4%BB%B6%E5%B0%81%E8%A3%85%E5%99%A8%20Wrapper%EF%BC%8C%E8%BF%99%E9%87%8C%E4%B8%8D%E5%A1%AB%E5%86%99%E8%A1%A8%E7%A4%BA%E6%97%A0%E4%BB%BB%E4%BD%95%E6%9D%A1%E4%BB%B6%EF%BC%8C%E5%85%A8%E9%87%8F%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%20%20%20%20List%3CUser%3E%20userList%20%3D%20userMapper.selectList(null)%3B%0A%0A%20%20%20%20%20%20%20%20userList.forEach(System.out%3A%3Aprintln)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%96%B0%E5%A2%9E%E4%B8%80%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testInsertUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E6%8F%92%E5%85%A5%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.name(%22%E5%BC%A0%E4%B8%89%E6%95%99%E7%A8%8B%20www.mashangan.com%22)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.age(30)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.gender(1)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.build()%3B%0A%0A%20%20%20%20%20%20%20%20userMapper.insert(user)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testDeleteUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%A0%B9%E6%8D%AE%E4%B8%BB%E9%94%AE%E5%88%A0%E9%99%A4%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20userMapper.deleteById(1)%3B%0A%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%A0%B9%E6%8D%AE%E4%B8%BB%E9%94%AE%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20userMapper.deleteBatchIds(Arrays.asList(1%2C%202))%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%9B%B4%E6%96%B0%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testUpdateUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E6%9B%B4%E6%96%B0%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.id(1L)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.name(%22%E5%BC%A0%E4%B8%89%E6%95%99%E7%A8%8B%20www.mashangan.com%22)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.build()%3B%0A%0A%20%20%20%20%20%20%20%20userMapper.updateById(user)%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-java\">\u003Cspan class=\"token annotation punctuation\">@SpringBootTest\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusBaseMapperTests\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\n    \u003Cspan class=\"token annotation punctuation\">@Autowired\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">UserMapper\u003C\u002Fspan> userMapper\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 查询数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \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 class-name\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 查询数据 ------\"\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  selectList() 方法的参数为 mybatis-plus 内置的条件封装器 Wrapper，这里不填写表示无任何条件，全量查询\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">List\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> userList \u003Cspan class=\"token operator\">=\u003C\u002Fspan> userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">selectList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n        userList\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">System\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\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     * 新增一条数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testInsertUser\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\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 插入数据 ------\"\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\">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>\n                \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>\n                \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>\n                \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>\n                \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\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\n    \u003Cspan class=\"token comment\">\u002F**\n     * 删除数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testDeleteUser\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\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 删除数据 ------\"\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 根据主键删除记录\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">deleteById\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 comment\">\u002F\u002F 根据主键批量删除记录\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">deleteBatchIds\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Arrays\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">asList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">2\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\n    \u003Cspan class=\"token comment\">\u002F**\n     * 更新数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testUpdateUser\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\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 更新数据 ------\"\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\">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>\n                \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">id\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1L\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                \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>\n                \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\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">updateById\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\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch2 id=\"toc-8\">九、结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了 Spring Boot 中如何快速整合集成 Mybatis-Plus, 同时在本地搭建了一个 MySQL 环境，演示了如何通过 Mybatis-Plus 实现了基本的增删改查操作。\u003C\u002Fp>","\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>前面小节\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>中，我们已经了解到什么是 Mybatis Plus， 以及和 Mybatis 的区别。本章节中，我们将上手学习如何使用它操作数据库。\u003C\u002Fp>\n\u003Ch2>一、数据库安装\u003C\u002Fh2>\n\u003Cp>本教程以 MySQL 数据库作为演示，所以第一步，你需要先确保你的机器已安装好 MySQL 。不知道如何安装的童鞋，可自行百度一下。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP :  也可以使用 Docker 安装 MySQL 环境，可参考之前的文章：《Docker 安装 MySQL 环境》\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\u003Ch2>二、新建测试库与表\u003C\u002Fh2>\n\u003Cp>MySQL 安装成功后，新建一个名为 \u003Ccode>test\u003C\u002Fcode> 的测试数据库，并创建一张用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>DROP TABLE IF EXISTS t_user;\n\nCREATE TABLE `t_user` (\n  `id` bigint(20) UNSIGNED NOT NULL AUTO_INCREMENT COMMENT '主键ID',\n  `name` varchar(30) NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) NULL 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) COMMENT = '用户表';\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch2>三、新建 Spring Boot 示例项目\u003C\u002Fh2>\n\u003Cp>数据库准备好了，我们来新建一个 Spring Boot 示例项目，用来讲解如何使用 Mybatis Plus，先放一张示例项目目录结构截图：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 不懂 Spring Boot 的童鞋，可以参考之前发布的文章：《Spring Boot 入门教程》\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\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F164870371940555-tWiM.png\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>注意 :\u003C\u002Fp>\n\u003Cp>全新的 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 3.0 版本基于 JDK8，提供了 \u003Ccode>lambda\u003C\u002Fcode> 形式的调用，所以安装集成 Mybatis-Plus 3.0 要求如下：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>JDK 8+；\u003C\u002Fli>\n\u003Cli>Maven or Gradle, 本文以 maven 作为版本管理工具；\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fblockquote>\n\u003Ch2>四、添加 Mybatis Plus 依赖\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>pom.xml\u003C\u002Fcode> 文件中添加以下依赖：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-xml\"><!-- mybatis-plus 依赖 -->\n<dependency>\n    <groupId>com.baomidou<\u002FgroupId>\n    <artifactId>mybatis-plus-boot-starter<\u002FartifactId>\n    <version>3.5.1<\u002Fversion>\n<\u002Fdependency>\n\n<!-- 单元测试依赖 -->\n<dependency>\n    <groupId>org.springframework.boot<\u002FgroupId>\n    <artifactId>spring-boot-starter-test<\u002FartifactId>\n    <scope>test<\u002Fscope>\n<\u002Fdependency>\n\n<!-- lombok 依赖（免写 setXXX\u002FgetXXX 方法） -->\n<dependency>\n    <groupId>org.projectlombok<\u002FgroupId>\n    <artifactId>lombok<\u002FartifactId>\n    <version>1.16.10<\u002Fversion>\n<\u002Fdependency>\n\n<!-- mysql 依赖 -->\n<dependency>\n    <groupId>mysql<\u002FgroupId>\n    <artifactId>mysql-connector-java<\u002FartifactId>\n<\u002Fdependency>\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>PS: 在写此教程的时候，MyBatis-Plus 的最新版本为 \u003Ccode>3.5.1\u003C\u002Fcode>。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>警告： 引入 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 之后请不要再次引入 \u003Ccode>MyBatis\u003C\u002Fcode> 以及 \u003Ccode>MyBatis-Spring\u003C\u002Fcode>，以避免因版本差异导致的问题。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>五、添加配置\u003C\u002Fh2>\n\u003Cp>接下来，在 \u003Ccode>applicaiton.yml\u003C\u002Fcode> 配置文件中添加 MySQL 数据库的相关配置（数据库驱动、连接、用户名和密码）：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-yml\"># 数据库配置\nspring:\n  datasource:\n    driver-class-name: com.mysql.cj.jdbc.Driver\n    url: jdbc:mysql:\u002F\u002F127.0.0.1:3306\u002Ftest?characterEncoding=utf-8\n    username: root\n    password: xxxx\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>然后，在项目根目录下新建一个 \u003Ccode>config\u003C\u002Fcode> 包，并创建 \u003Ccode>MybatisPlusConfig\u003C\u002Fcode> 配置类：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>\u002F**\n * @Author: 张三\n * @Date: 2022-12-15 18:29\n * @Version: v1.0.0\n * @Description: TODO\n **\u002F\n@Configuration\n@MapperScan("com.mashangan.mybatisplusdemo.mapper")\npublic class MybatisPlusConfig {\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@MapperScan\u003C\u002Fcode> 注解用于告诉 Mybatis Plus 框架需要扫描的 \u003Ccode>mapper\u003C\u002Fcode> 类的包路径，\u003Ccode>mapper\u003C\u002Fcode> 类主要用于操作数据库，学习过 Mybatis 的童鞋应该都非常清楚，这里提一嘴是防止可能会有些没学过 Mybatis 的小伙伴。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>六、添加实体类\u003C\u002Fh2>\n\u003Cp>前面已经建好了用户表，下面编写用户表对应的数据库实体类 \u003Ccode>User.java\u003C\u002Fcode> :\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">@Data\n@Builder\n@TableName("t_user")\npublic class User {\n    @TableId(type = IdType.AUTO)\n    private Long id;\n    private String name;\n    private Integer age;\n    private Integer gender;\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cul>\n\u003Cli>\u003Ccode>@TableName("t_user")\u003C\u002Fcode> 注解用于指定表名；\u003C\u002Fli>\n\u003Cli>\u003Ccode>@TableId(type = IdType.AUTO)\u003C\u002Fcode> 注解指定了字段 \u003Ccode>id\u003C\u002Fcode> 为表的主键，同时指定主键为自增类型。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP： \u003Ccode>@Data\u003C\u002Fcode> 和 \u003Ccode>@Builder\u003C\u002Fcode> 是 Lombok 注解，偷懒用的，加上它即可编译自动生成 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 等相关方法，不了解的小伙伴可自行搜索一下如何使用。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>七、添加 Mapper 类\u003C\u002Fh2>\n\u003Cp>在项目根目录下创建 \u003Ccode>mapper\u003C\u002Fcode> 包，并新建 \u003Ccode>UserMapper\u003C\u002Fcode>  接口，同时继承自 \u003Ccode>BaseMapper\u003C\u002Fcode>， 代码如下:\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">public interface UserMapper extends BaseMapper<User> {\n    \n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>\u003Ccode>BaseMapper\u003C\u002Fcode> 接口由 Mybatis Plus 提供，封装了一些常用的 CRUD 操作，使得我们无需像 Mybatis 那样编写 \u003Ccode>xml\u003C\u002Fcode> 文件，就拥有了基本的 CRUD 功能，点击 \u003Ccode>BaseMapper\u003C\u002Fcode> 接口，源码如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">public interface BaseMapper<T> extends Mapper<T> {\n    \u002F\u002F 新增数据\n    int insert(T entity);\n\t\u002F\u002F 根据 ID 删除\n    int deleteById(Serializable id);\n\t\u002F\u002F 删除数据\n    int deleteByMap(@Param("cm") Map<String, Object> columnMap);\n\t\u002F\u002F 删除数据\n    int delete(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 根据 ID 批量删除数据\n    int deleteBatchIds(@Param("coll") Collection<? extends Serializable> idList);\n\t\u002F\u002F 根据 ID 更新\n    int updateById(@Param("et") T entity);\n\t\u002F\u002F 更新数据\n    int update(@Param("et") T entity, @Param("ew") Wrapper<T> updateWrapper);\n\t\u002F\u002F 根据 ID 查询\n    T selectById(Serializable id);\n\t\u002F\u002F 根据 ID 批量查询\n    List<T> selectBatchIds(@Param("coll") Collection<? extends Serializable> idList);\n\t\u002F\u002F 查询数据\n    List<T> selectByMap(@Param("cm") Map<String, Object> columnMap);\n\t\u002F\u002F 查询一条数据\n    T selectOne(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询记录总数\n    Integer selectCount(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询多条数据\n    List<T> selectList(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询多条数据\n    List<Map<String, Object>> selectMaps(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 查询多条数据\n    List<Object> selectObjs(@Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 分页查询\n    <E extends IPage<T>> E selectPage(E page, @Param("ew") Wrapper<T> queryWrapper);\n\t\u002F\u002F 分页查询\n    <E extends IPage<Map<String, Object>>> E selectMapsPage(E page, @Param("ew") Wrapper<T> queryWrapper);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>可以先简单看一眼，有个印象就行，后续章节中将学习如何使用它们。\u003C\u002Fp>\n\u003Ch2>八、简单的 CRUD\u003C\u002Fh2>\n\u003Cp>在单元测试包下，创建一个测试类 \u003Ccode>MybatisPlusBaseMapperTests\u003C\u002Fcode>，编写几个 CURD 的测试方法，测试代码如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode class=\"language-java\">@SpringBootTest\nclass MybatisPlusBaseMapperTests {\n\n    @Autowired\n    private UserMapper userMapper;\n\n    \u002F**\n     * 查询数据\n     *\u002F\n    @Test\n    public void testSelectUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 查询数据 ------"));\n        \u002F\u002F  selectList() 方法的参数为 mybatis-plus 内置的条件封装器 Wrapper，这里不填写表示无任何条件，全量查询\n        List<User> userList = userMapper.selectList(null);\n\n        userList.forEach(System.out::println);\n    }\n\n    \u002F**\n     * 新增一条数据\n     *\u002F\n    @Test\n    public void testInsertUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 插入数据 ------"));\n        User user = User.builder()\n                .name("编码世界")\n                .age(30)\n                .gender(1)\n                .build();\n\n        userMapper.insert(user);\n    }\n\n    \u002F**\n     * 删除数据\n     *\u002F\n    @Test\n    public void testDeleteUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 删除数据 ------"));\n        \u002F\u002F 根据主键删除记录\n        userMapper.deleteById(1);\n\n        \u002F\u002F 根据主键批量删除记录\n        userMapper.deleteBatchIds(Arrays.asList(1, 2));\n    }\n\n    \u002F**\n     * 更新数据\n     *\u002F\n    @Test\n    public void testUpdateUser() {\n        System.out.println(("----- 开始测试 mybatis-plus 更新数据 ------"));\n        User user = User.builder()\n                .id(1L)\n                .name("编码世界")\n                .build();\n\n        userMapper.updateById(user);\n    }\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch2>九、结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了 Spring Boot 中如何快速整合集成 Mybatis-Plus, 同时在本地搭建了一个 MySQL 环境，演示了如何通过 Mybatis-Plus 实现了基本的增删改查操作。\u003C\u002Fp>\n13:Tc793,\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>前面小节\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>中，我们已经了解到什么是 Mybatis Plus， 以及和 Mybatis 的区别。本章节中，我们将上手学习如何使用它操作数据库。\u003C\u002Fp>\n\u003Ch2 id=\"toc-0\">一、数据库安装\u003C\u002Fh2>\n\u003Cp>本教程以 MySQL 数据库作为演示，所以第一步，你需要先确保你的机器已安装好 MySQL 。不知道如何安装的童鞋，可自行百度一下。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP :  也可以使用 Docker 安装 MySQL 环境，可参考之前的文章：《Docker 安装 MySQL 环境》\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\u003Ch2 id=\"toc-1\">二、新建测试库与表\u003C\u002Fh2>\n\u003Cp>MySQL 安装成功后，新建一个名为 \u003Ccode>test\u003C\u002Fcode> 的测试数据库，并创建一张用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"DROP%20TABLE%20IF%20EXISTS%20t_user%3B%0A%0ACREATE%20TABLE%20%60t_user%60%20(%0A%20%20%60id%60%20bigint(20)%20UNSIGNED%20NOT%20NULL%20AUTO_INCREMENT%20COMMENT%20'%E4%B8%BB%E9%94%AEID'%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)%20NULL%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%200%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)%20COMMENT%20%3D%20'%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\">DROP\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">IF\u003C\u002Fspan> \u003Cspan class=\"token keyword\">EXISTS\u003C\u002Fspan> t_user\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\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\">'主键ID'\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 boolean\">NULL\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 number\">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\">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\u003Ch2 id=\"toc-2\">三、新建 Spring Boot 示例项目\u003C\u002Fh2>\n\u003Cp>数据库准备好了，我们来新建一个 Spring Boot 示例项目，用来讲解如何使用 Mybatis Plus，先放一张示例项目目录结构截图：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 不懂 Spring Boot 的童鞋，可以参考之前发布的文章：《Spring Boot 入门教程》\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\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F164870371940555-tWiM.png\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>注意 :\u003C\u002Fp>\n\u003Cp>全新的 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 3.0 版本基于 JDK8，提供了 \u003Ccode>lambda\u003C\u002Fcode> 形式的调用，所以安装集成 Mybatis-Plus 3.0 要求如下：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>JDK 8+；\u003C\u002Fli>\n\u003Cli>Maven or Gradle, 本文以 maven 作为版本管理工具；\u003C\u002Fli>\n\u003C\u002Ful>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-3\">四、添加 Mybatis Plus 依赖\u003C\u002Fh2>\n\u003Cp>在 \u003Ccode>pom.xml\u003C\u002Fcode> 文件中添加以下依赖：\u003C\u002Fp>\n\u003Cdiv class=\"language-xml\" data-ext=\"xml\" data-code=\"%3C!--%20mybatis-plus%20%E4%BE%9D%E8%B5%96%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Ecom.baomidou%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Emybatis-plus-boot-starter%3C%2FartifactId%3E%0A%20%20%20%20%3Cversion%3E3.5.1%3C%2Fversion%3E%0A%3C%2Fdependency%3E%0A%0A%3C!--%20%E5%8D%95%E5%85%83%E6%B5%8B%E8%AF%95%E4%BE%9D%E8%B5%96%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Eorg.springframework.boot%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Espring-boot-starter-test%3C%2FartifactId%3E%0A%20%20%20%20%3Cscope%3Etest%3C%2Fscope%3E%0A%3C%2Fdependency%3E%0A%0A%3C!--%20lombok%20%E4%BE%9D%E8%B5%96%EF%BC%88%E5%85%8D%E5%86%99%20setXXX%2FgetXXX%20%E6%96%B9%E6%B3%95%EF%BC%89%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Eorg.projectlombok%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Elombok%3C%2FartifactId%3E%0A%20%20%20%20%3Cversion%3E1.16.10%3C%2Fversion%3E%0A%3C%2Fdependency%3E%0A%0A%3C!--%20mysql%20%E4%BE%9D%E8%B5%96%20--%3E%0A%3Cdependency%3E%0A%20%20%20%20%3CgroupId%3Emysql%3C%2FgroupId%3E%0A%20%20%20%20%3CartifactId%3Emysql-connector-java%3C%2FartifactId%3E%0A%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\"><!-- 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>3.5.1\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\n\u003Cspan class=\"token comment\"><!-- 单元测试依赖 -->\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>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\"><!-- lombok 依赖（免写 setXXX\u002FgetXXX 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>version\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>1.16.10\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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>PS: 在写此教程的时候，MyBatis-Plus 的最新版本为 \u003Ccode>3.5.1\u003C\u002Fcode>。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cblockquote>\n\u003Cp>\u003Cstrong>警告： 引入 \u003Ccode>MyBatis-Plus\u003C\u002Fcode> 之后请不要再次引入 \u003Ccode>MyBatis\u003C\u002Fcode> 以及 \u003Ccode>MyBatis-Spring\u003C\u002Fcode>，以避免因版本差异导致的问题。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-4\">五、添加配置\u003C\u002Fh2>\n\u003Cp>接下来，在 \u003Ccode>applicaiton.yml\u003C\u002Fcode> 配置文件中添加 MySQL 数据库的相关配置（数据库驱动、连接、用户名和密码）：\u003C\u002Fp>\n\u003Cdiv class=\"language-yml\" data-ext=\"yml\" data-code=\"%23%20%E6%95%B0%E6%8D%AE%E5%BA%93%E9%85%8D%E7%BD%AE%0Aspring%3A%0A%20%20datasource%3A%0A%20%20%20%20driver-class-name%3A%20com.mysql.cj.jdbc.Driver%0A%20%20%20%20url%3A%20jdbc%3Amysql%3A%2F%2F127.0.0.1%3A3306%2Ftest%3FcharacterEncoding%3Dutf-8%0A%20%20%20%20username%3A%20root%0A%20%20%20%20password%3A%20xxxx%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 comment\"># 数据库配置\u003C\u002Fspan>\n\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.mysql.cj.jdbc.Driver\n    \u003Cspan class=\"token key atrule\">url\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">:\u003C\u002Fspan> jdbc\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\u002Ftest\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> xxxx\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>然后，在项目根目录下新建一个 \u003Ccode>config\u003C\u002Fcode> 包，并创建 \u003Ccode>MybatisPlusConfig\u003C\u002Fcode> 配置类：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%2F**%0A%20*%20%40Author%3A%20%E5%BC%A0%E4%B8%89%0A%20*%20%40From%3A%20%E5%85%AC%E4%BC%97%E5%8F%B7%EF%BC%9A%E5%BC%A0%E4%B8%89%2C%20%E7%BD%91%E7%AB%99%EF%BC%9Awww.mashangan.com%0A%20*%20%40Date%3A%202022-12-15%2018%3A29%0A%20*%20%40Version%3A%20v1.0.0%0A%20*%20%40Description%3A%20TODO%0A%20**%2F%0A%40Configuration%0A%40MapperScan(%22com.mashangan.mybatisplusdemo.mapper%22)%0Apublic%20class%20MybatisPlusConfig%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 comment\">\u002F**\n * @Author: 张三\n * @Date: 2022-12-15 18:29\n * @Version: v1.0.0\n * @Description: TODO\n **\u002F\u003C\u002Fspan>\n\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 punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@MapperScan\u003C\u002Fcode> 注解用于告诉 Mybatis Plus 框架需要扫描的 \u003Ccode>mapper\u003C\u002Fcode> 类的包路径，\u003Ccode>mapper\u003C\u002Fcode> 类主要用于操作数据库，学习过 Mybatis 的童鞋应该都非常清楚，这里提一嘴是防止可能会有些没学过 Mybatis 的小伙伴。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-5\">六、添加实体类\u003C\u002Fh2>\n\u003Cp>前面已经建好了用户表，下面编写用户表对应的数据库实体类 \u003Ccode>User.java\u003C\u002Fcode> :\u003C\u002Fp>\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%20%40TableId(type%20%3D%20IdType.AUTO)%0A%20%20%20%20private%20Long%20id%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 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\">AUTO\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 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\u003Cul>\n\u003Cli>\u003Ccode>@TableName("t_user")\u003C\u002Fcode> 注解用于指定表名；\u003C\u002Fli>\n\u003Cli>\u003Ccode>@TableId(type = IdType.AUTO)\u003C\u002Fcode> 注解指定了字段 \u003Ccode>id\u003C\u002Fcode> 为表的主键，同时指定主键为自增类型。\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP： \u003Ccode>@Data\u003C\u002Fcode> 和 \u003Ccode>@Builder\u003C\u002Fcode> 是 Lombok 注解，偷懒用的，加上它即可编译自动生成 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 等相关方法，不了解的小伙伴可自行搜索一下如何使用。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-6\">七、添加 Mapper 类\u003C\u002Fh2>\n\u003Cp>在项目根目录下创建 \u003Ccode>mapper\u003C\u002Fcode> 包，并新建 \u003Ccode>UserMapper\u003C\u002Fcode>  接口，同时继承自 \u003Ccode>BaseMapper\u003C\u002Fcode>， 代码如下:\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"public%20interface%20UserMapper%20extends%20BaseMapper%3CUser%3E%20%7B%0A%20%20%20%20%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    \n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>\u003Ccode>BaseMapper\u003C\u002Fcode> 接口由 Mybatis Plus 提供，封装了一些常用的 CRUD 操作，使得我们无需像 Mybatis 那样编写 \u003Ccode>xml\u003C\u002Fcode> 文件，就拥有了基本的 CRUD 功能，点击 \u003Ccode>BaseMapper\u003C\u002Fcode> 接口，源码如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"public%20interface%20BaseMapper%3CT%3E%20extends%20Mapper%3CT%3E%20%7B%0A%20%20%20%20%2F%2F%20%E6%96%B0%E5%A2%9E%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20insert(T%20entity)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E5%88%A0%E9%99%A4%0A%20%20%20%20int%20deleteById(Serializable%20id)%3B%0A%09%2F%2F%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20deleteByMap(%40Param(%22cm%22)%20Map%3CString%2C%20Object%3E%20columnMap)%3B%0A%09%2F%2F%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20delete(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20deleteBatchIds(%40Param(%22coll%22)%20Collection%3C%3F%20extends%20Serializable%3E%20idList)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%9B%B4%E6%96%B0%0A%20%20%20%20int%20updateById(%40Param(%22et%22)%20T%20entity)%3B%0A%09%2F%2F%20%E6%9B%B4%E6%96%B0%E6%95%B0%E6%8D%AE%0A%20%20%20%20int%20update(%40Param(%22et%22)%20T%20entity%2C%20%40Param(%22ew%22)%20Wrapper%3CT%3E%20updateWrapper)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%9F%A5%E8%AF%A2%0A%20%20%20%20T%20selectById(Serializable%20id)%3B%0A%09%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E6%89%B9%E9%87%8F%E6%9F%A5%E8%AF%A2%0A%20%20%20%20List%3CT%3E%20selectBatchIds(%40Param(%22coll%22)%20Collection%3C%3F%20extends%20Serializable%3E%20idList)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CT%3E%20selectByMap(%40Param(%22cm%22)%20Map%3CString%2C%20Object%3E%20columnMap)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E4%B8%80%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20T%20selectOne(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E8%AE%B0%E5%BD%95%E6%80%BB%E6%95%B0%0A%20%20%20%20Integer%20selectCount(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E5%A4%9A%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CT%3E%20selectList(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E5%A4%9A%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CMap%3CString%2C%20Object%3E%3E%20selectMaps(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E6%9F%A5%E8%AF%A2%E5%A4%9A%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20List%3CObject%3E%20selectObjs(%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E5%88%86%E9%A1%B5%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%3CE%20extends%20IPage%3CT%3E%3E%20E%20selectPage(E%20page%2C%20%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%3B%0A%09%2F%2F%20%E5%88%86%E9%A1%B5%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%3CE%20extends%20IPage%3CMap%3CString%2C%20Object%3E%3E%3E%20E%20selectMapsPage(E%20page%2C%20%40Param(%22ew%22)%20Wrapper%3CT%3E%20queryWrapper)%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 keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">interface\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\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Mapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F\u002F 新增数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">insert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan> entity\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 删除\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">deleteById\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan> id\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 删除数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">deleteByMap\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"cm\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \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> columnMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 删除数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">delete\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 批量删除数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">deleteBatchIds\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"coll\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Collection\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">?\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> idList\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 更新\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">updateById\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"et\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> entity\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 更新数据\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">int\u003C\u002Fspan> \u003Cspan class=\"token function\">update\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"et\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> entity\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> updateWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 查询\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> \u003Cspan class=\"token function\">selectById\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan> id\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 根据 ID 批量查询\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectBatchIds\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"coll\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Collection\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token operator\">?\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Serializable\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> idList\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectByMap\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"cm\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \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> columnMap\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询一条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">T\u003C\u002Fspan> \u003Cspan class=\"token function\">selectOne\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询记录总数\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> \u003Cspan class=\"token function\">selectCount\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询多条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询多条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Map\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token function\">selectMaps\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 查询多条数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">List\u003C\u002Fspan>\u003Cspan class=\"token generics\">\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 function\">selectObjs\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 分页查询\u003C\u002Fspan>\n    \u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">IPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token function\">selectPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> page\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\t\u003Cspan class=\"token comment\">\u002F\u002F 分页查询\u003C\u002Fspan>\n    \u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token keyword\">extends\u003C\u002Fspan> \u003Cspan class=\"token class-name\">IPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Map\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token class-name\">E\u003C\u002Fspan> \u003Cspan class=\"token function\">selectMapsPage\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">E\u003C\u002Fspan> page\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token annotation punctuation\">@Param\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"ew\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Wrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token class-name\">T\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan> queryWrapper\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>可以先简单看一眼，有个印象就行，后续章节中将学习如何使用它们。\u003C\u002Fp>\n\u003Ch2 id=\"toc-7\">八、简单的 CRUD\u003C\u002Fh2>\n\u003Cp>在单元测试包下，创建一个测试类 \u003Ccode>MybatisPlusBaseMapperTests\u003C\u002Fcode>，编写几个 CURD 的测试方法，测试代码如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40SpringBootTest%0Aclass%20MybatisPlusBaseMapperTests%20%7B%0A%0A%20%20%20%20%40Autowired%0A%20%20%20%20private%20UserMapper%20userMapper%3B%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%9F%A5%E8%AF%A2%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testSelectUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E6%9F%A5%E8%AF%A2%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%20selectList()%20%E6%96%B9%E6%B3%95%E7%9A%84%E5%8F%82%E6%95%B0%E4%B8%BA%20mybatis-plus%20%E5%86%85%E7%BD%AE%E7%9A%84%E6%9D%A1%E4%BB%B6%E5%B0%81%E8%A3%85%E5%99%A8%20Wrapper%EF%BC%8C%E8%BF%99%E9%87%8C%E4%B8%8D%E5%A1%AB%E5%86%99%E8%A1%A8%E7%A4%BA%E6%97%A0%E4%BB%BB%E4%BD%95%E6%9D%A1%E4%BB%B6%EF%BC%8C%E5%85%A8%E9%87%8F%E6%9F%A5%E8%AF%A2%0A%20%20%20%20%20%20%20%20List%3CUser%3E%20userList%20%3D%20userMapper.selectList(null)%3B%0A%0A%20%20%20%20%20%20%20%20userList.forEach(System.out%3A%3Aprintln)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%96%B0%E5%A2%9E%E4%B8%80%E6%9D%A1%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testInsertUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E6%8F%92%E5%85%A5%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.name(%22%E5%BC%A0%E4%B8%89%E6%95%99%E7%A8%8B%20www.mashangan.com%22)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.age(30)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.gender(1)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.build()%3B%0A%0A%20%20%20%20%20%20%20%20userMapper.insert(user)%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testDeleteUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E5%88%A0%E9%99%A4%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%A0%B9%E6%8D%AE%E4%B8%BB%E9%94%AE%E5%88%A0%E9%99%A4%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20userMapper.deleteById(1)%3B%0A%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%A0%B9%E6%8D%AE%E4%B8%BB%E9%94%AE%E6%89%B9%E9%87%8F%E5%88%A0%E9%99%A4%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20userMapper.deleteBatchIds(Arrays.asList(1%2C%202))%3B%0A%20%20%20%20%7D%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%9B%B4%E6%96%B0%E6%95%B0%E6%8D%AE%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40Test%0A%20%20%20%20public%20void%20testUpdateUser()%20%7B%0A%20%20%20%20%20%20%20%20System.out.println((%22-----%20%E5%BC%80%E5%A7%8B%E6%B5%8B%E8%AF%95%20mybatis-plus%20%E6%9B%B4%E6%96%B0%E6%95%B0%E6%8D%AE%20------%22))%3B%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder()%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.id(1L)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.name(%22%E5%BC%A0%E4%B8%89%E6%95%99%E7%A8%8B%20www.mashangan.com%22)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.build()%3B%0A%0A%20%20%20%20%20%20%20%20userMapper.updateById(user)%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-java\">\u003Cspan class=\"token annotation punctuation\">@SpringBootTest\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">class\u003C\u002Fspan> \u003Cspan class=\"token class-name\">MybatisPlusBaseMapperTests\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\n    \u003Cspan class=\"token annotation punctuation\">@Autowired\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">UserMapper\u003C\u002Fspan> userMapper\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token comment\">\u002F**\n     * 查询数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \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 class-name\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 查询数据 ------\"\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  selectList() 方法的参数为 mybatis-plus 内置的条件封装器 Wrapper，这里不填写表示无任何条件，全量查询\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">List\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> userList \u003Cspan class=\"token operator\">=\u003C\u002Fspan> userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">selectList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n        userList\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">forEach\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">System\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>out\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">println\u003C\u002Fspan>\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     * 新增一条数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testInsertUser\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\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 插入数据 ------\"\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\">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>\n                \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"编码世界\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                \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>\n                \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>\n                \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\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\n    \u003Cspan class=\"token comment\">\u002F**\n     * 删除数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testDeleteUser\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\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 删除数据 ------\"\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 根据主键删除记录\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">deleteById\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 comment\">\u002F\u002F 根据主键批量删除记录\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">deleteBatchIds\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token class-name\">Arrays\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">asList\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">2\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\n    \u003Cspan class=\"token comment\">\u002F**\n     * 更新数据\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">public\u003C\u002Fspan> \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testUpdateUser\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\">System\u003C\u002Fspan>\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>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"----- 开始测试 mybatis-plus 更新数据 ------\"\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\">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>\n                \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">id\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">1L\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"编码世界\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n                \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\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">updateById\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\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch2 id=\"toc-8\">九、结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们学习了 Spring Boot 中如何快速整合集成 Mybatis-Plus, 同时在本地搭建了一个 MySQL 环境，演示了如何通过 Mybatis-Plus 实现了基本的增删改查操作。\u003C\u002Fp>"]