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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":379,"creationTimestamp":380},{"title":382,"slug":383,"cover":384,"excerpt":487,"publishTime":387,"categories":488,"tags":489,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":386,"autoGenerate":93},[87],[],{"permalink":391,"excerpt":386,"lastModifyTime":392,"phase":116},[492],{"metadata":493,"spec":494,"status":495,"postCount":96},{"name":87,"creationTimestamp":88},{"displayName":90,"slug":87,"cover":91,"description":92,"priority":27,"hideFromList":93,"preventParentPostCascadeQuery":93},{"permalink":95,"postCount":96,"visiblePostCount":96},{"content":497,"raw":498},"\u003Cp>\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何通过 Mybatis Plus 实现逻辑删除功能。\u003C\u002Fp>\n\u003Ch2>什么是逻辑删除？\u003C\u002Fh2>\n\u003Cp>讲逻辑删除之前，先说说\u003Cem>物理删除\u003C\u002Fem>。当我们想要删除数据库中的数据，都会执行一条 \u003Ccode>delete\u003C\u002Fcode> 语句，执行成功后，会将相关数据彻底从磁盘中删除掉，这种我们称之为物理删除。\u003C\u002Fp>\n\u003Cp>\u003Cstrong>逻辑删除其实并不是真正意义上的删除，它其实一条更新语句。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>通常做法是在表中新增一个 \u003Ccode>is_deleted\u003C\u002Fcode> 字段，用来标识该记录的状态，默认值为 \u003Ccode>0\u003C\u002Fcode>, 表示未删除状态，执行逻辑删除后，会将该字段更新为 \u003Ccode>1\u003C\u002Fcode> , 表示已被删除。当然，查询的时候也会带上条件 \u003Ccode>where is_deleted = 0\u003C\u002Fcode>, 只会查询状态未被删除的记录。\u003C\u002Fp>\n\u003Cp>举个栗子，假设我跳槽了一个新公司，入职后第一天，都会在公司的 OA 系统中录入员工信息，并分配了一个员工工号，结果我干一个星期，发现这个公司代码写的贼烂，坑贼多，考虑再三又离职了，这时候人事会将我从 OA 系统的员工库中进行删除，这种情况也是逻辑删除，实际上即时你离职了，还是可以从历史员工库中调出来查看。\u003C\u002Fp>\n\u003Ch2>为什么需要逻辑删除？\u003C\u002Fh2>\n\u003Cp>逻辑删除的好处是：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>方便恢复数据\u003C\u002Fstrong>（比如我想明白了，重新回公司入职，更新一个数据状态就行，工号还是那个工号）；\u003C\u002Fli>\n\u003Cli>\u003Cstrong>数据有挖掘价值\u003C\u002Fstrong>（比如电商平台的订单，你虽然手动删除了订单，但是后台并不会删除，还会通过这些订单进行分析，给用户打标签，从而推荐给用户相类似的商品）\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP : 要不要使用逻辑删除，得结合数据价值来看，如果是没有用的数据，还是物理删除比较好，能够节省磁盘空间。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>Mybatis Plus 实现逻辑删除\u003C\u002Fh2>\n\u003Cp>好了，了解完逻辑删除的相关概念，我们来看看 Mybatis Plus 如何实现逻辑删除。\u003C\u002Fp>\n\u003Ch3>新建测试表\u003C\u002Fh3>\n\u003Cp>删除前面小节中用户表，重新创建一张带有逻辑删除字段的用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>最佳实践：逻辑删除字段请添加默认值 \u003Ccode>0\u003C\u002Fcode>，防止后面新增数据时，还需要手动设置。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cpre>\u003Ccode>CREATE TABLE `t_user` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',\n  `name` varchar(30) COLLATE utf8mb4_bin NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT 0 COMMENT '性别，0：女 1：男',\n  `is_deleted` tinyint(2) NOT NULL DEFAULT 0 COMMENT '逻辑删除(0：未删除，1:已删除)',\t\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin COMMENT='用户表';\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>实体类\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>model\u003C\u002Fcode> 包下创建 \u003Ccode>User\u003C\u002Fcode> 实体类：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>\u002F**\n * @author: 张三\n * @date: 2022-12-13 14:13\n * @version: v1.0.0\n * @description: TODO\n **\u002F\n@Data\n@Builder\n@AllArgsConstructor\n@NoArgsConstructor\n@TableName("t_user")\npublic class User {\n    \u002F**\n     * 主键 ID\n     *\u002F\n    @TableId(value = "id", type = IdType.AUTO)\n    private Long id;\n    \u002F**\n     * 姓名\n     *\u002F\n    private String name;\n    \u002F**\n     * 年龄\n     *\u002F\n    private Integer age;\n    \u002F**\n     * 性别\n     *\u002F\n    private Integer gender;\n\n    \u002F**\n     * 逻辑删除\n     *\u002F\n    @TableLogic\n    private Integer isDeleted;\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>注意，Mybatis Plus 提供了 \u003Ccode>@TableLogic\u003C\u002Fcode> 逻辑删除注解，只要添加在相关字段上，即可拥有逻辑删除功能。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@Data\u003C\u002Fcode> \u003Ccode>@Builder\u003C\u002Fcode> \u003Ccode>@AllArgsConstructor\u003C\u002Fcode> \u003Ccode>@NoArgsConstructor\u003C\u002Fcode> 都是 Lombok 注解，偷懒用的，加上它即编译自动添加 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 、\u003Ccode>类构造器\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\u003Ch3>单元测试\u003C\u002Fh3>\n\u003Cp>完成前面的工作后，我们新建单元测试，看看好不好使：\u003C\u002Fp>\n\u003Ch4>新增数据\u003C\u002Fh4>\n\u003Cp>新增一条测试数据，为后面测试做准备：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@Test\nvoid testTableLogic() {\n    \u002F\u002F 添加测试数据\n    User user = User.builder()\n                    .name("张三")\n                    .age(30)\n                    .gender(1)\n                    .build();\n    userMapper.insert(user);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>修改数据\u003C\u002Fh3>\n\u003Cp>修改记录，看看实际执行的 SQL 是什么：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>    @Test\n    void testTableLogic() {\n        \u002F\u002F 根据 ID 修改记录\n        User user = User.builder().id(1L).name("www.mashangan.com").build();\n        userMapper.updateById(user);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下，可以看到自动附带上了逻辑删除字段的条件 \u003Ccode>is_deleted = 0\u003C\u002Fcode>：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167342410850389-rEGQ.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>再来看看根据 Wrapper 条件构造器来修改记录：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>    @Test\n    void testTableLogic() {\n        User user1 = User.builder().name("www.mashangan.com").build();\n        \u002F\u002F 修改 name 等于 张三 的记录\n        UpdateWrapper<User> wrapper = new UpdateWrapper<>();\n        wrapper.eq("name", "张三");\n        userMapper.update(user1, wrapper);\n\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下, 同样也是 OK 的：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167342448565316-QpIC.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Ch3>删除记录\u003C\u002Fh3>\n\u003Cp>最后看看，删除记录是不是执行了更新操作，将 \u003Ccode>is_deleted\u003C\u002Fcode> 字段更新为了 \u003Ccode>1\u003C\u002Fcode> , 单元测试代码如下:\u003C\u002Fp>\n\u003Cpre>\u003Ccode>    @Test\n    void testTableLogic() {\n\t\t\u002F\u002F 删除 ID 为 1 的记录\n        userMapper.deleteById(1L);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>控制台打印 SQL 如下, 效果完美：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167342473334839-NWKy.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Ch2>结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们了解了什么是逻辑删除，以及使用逻辑删除的好处，最后演示了 Mybatis Plus 如何实现逻辑删除，还是非常方便的，简简单单一个注解就搞定了。\u003C\u002Fp>\n13:T57a3,\u003Ch2 id=\"toc-0\">前言\u003C\u002Fh2>\n\u003Cp>\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何通过 Mybatis Plus 实现逻辑删除功能。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">什么是逻辑删除？\u003C\u002Fh2>\n\u003Cp>讲逻辑删除之前，先说说\u003Cem>物理删除\u003C\u002Fem>。当我们想要删除数据库中的数据，都会执行一条 \u003Ccode>delete\u003C\u002Fcode> 语句，执行成功后，会将相关数据彻底从磁盘中删除掉，这种我们称之为物理删除。\u003C\u002Fp>\n\u003Cp>\u003Cstrong>逻辑删除其实并不是真正意义上的删除，它其实一条更新语句。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>通常做法是在表中新增一个 \u003Ccode>is_deleted\u003C\u002Fcode> 字段，用来标识该记录的状态，默认值为 \u003Ccode>0\u003C\u002Fcode>, 表示未删除状态，执行逻辑删除后，会将该字段更新为 \u003Ccode>1\u003C\u002Fcode> , 表示已被删除。当然，查询的时候也会带上条件 \u003Ccode>where is_deleted = 0\u003C\u002Fcode>, 只会查询状态未被删除的记录。\u003C\u002Fp>\n\u003Cp>举个栗子，假设我跳槽了一个新公司，入职后第一天，都会在公司的 OA 系统中录入员工信息，并分配了一个员工工号，结果我干一个星期，发现这个公司代码写的贼烂，坑贼多，考虑再三又离职了，这时候人事会将我从 OA 系统的员工库中进行删除，这种情况也是逻辑删除，实际上即时你离职了，还是可以从历史员工库中调出来查看。\u003C\u002Fp>\n\u003Ch2 id=\"toc-2\">为什么需要逻辑删除？\u003C\u002Fh2>\n\u003Cp>逻辑删除的好处是：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>方便恢复数据\u003C\u002Fstrong>（比如我想明白了，重新回公司入职，更新一个数据状态就行，工号还是那个工号）；\u003C\u002Fli>\n\u003Cli>\u003Cstrong>数据有挖掘价值\u003C\u002Fstrong>（比如电商平台的订单，你虽然手动删除了订单，但是后台并不会删除，还会通过这些订单进行分析，给用户打标签，从而推荐给用户相类似的商品）\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP : 要不要使用逻辑删除，得结合数据价值来看，如果是没有用的数据，还是物理删除比较好，能够节省磁盘空间。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-3\">Mybatis Plus 实现逻辑删除\u003C\u002Fh2>\n\u003Cp>好了，了解完逻辑删除的相关概念，我们来看看 Mybatis Plus 如何实现逻辑删除。\u003C\u002Fp>\n\u003Ch3 id=\"toc-4\">新建测试表\u003C\u002Fh3>\n\u003Cp>删除前面小节中用户表，重新创建一张带有逻辑删除字段的用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>最佳实践：逻辑删除字段请添加默认值 \u003Ccode>0\u003C\u002Fcode>，防止后面新增数据时，还需要手动设置。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"CREATE%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)%20COLLATE%20utf8mb4_bin%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%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%20%60is_deleted%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%200%20COMMENT%20'%E9%80%BB%E8%BE%91%E5%88%A0%E9%99%A4(0%EF%BC%9A%E6%9C%AA%E5%88%A0%E9%99%A4%EF%BC%8C1%3A%E5%B7%B2%E5%88%A0%E9%99%A4)'%2C%09%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COLLATE%3Dutf8mb4_bin%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-sql\">\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user\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 keyword\">COLLATE\u003C\u002Fspan> utf8mb4_bin \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token 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 identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>is_deleted\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\">'逻辑删除(0：未删除，1:已删除)'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\t\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COLLATE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4_bin \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\u003Ch3 id=\"toc-5\">实体类\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>model\u003C\u002Fcode> 包下创建 \u003Ccode>User\u003C\u002Fcode> 实体类：\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%202022-12-13%2014%3A13%0A%20*%20%40version%3A%20v1.0.0%0A%20*%20%40description%3A%20TODO%0A%20**%2F%0A%40Data%0A%40Builder%0A%40AllArgsConstructor%0A%40NoArgsConstructor%0A%40TableName(%22t_user%22)%0Apublic%20class%20User%20%7B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E4%B8%BB%E9%94%AE%20ID%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40TableId(value%20%3D%20%22id%22%2C%20type%20%3D%20IdType.AUTO)%0A%20%20%20%20private%20Long%20id%3B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E5%A7%93%E5%90%8D%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20String%20name%3B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E5%B9%B4%E9%BE%84%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20Integer%20age%3B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%80%A7%E5%88%AB%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20Integer%20gender%3B%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E9%80%BB%E8%BE%91%E5%88%A0%E9%99%A4%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40TableLogic%0A%20%20%20%20private%20Integer%20isDeleted%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 comment\">\u002F**\n * @author: 张三\n * @date: 2022-12-13 14:13\n * @version: v1.0.0\n * @description: TODO\n **\u002F\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@Data\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@Builder\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@AllArgsConstructor\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@NoArgsConstructor\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 comment\">\u002F**\n     * 主键 ID\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@TableId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>value \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"id\"\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 comment\">\u002F**\n     * 姓名\n     *\u002F\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 comment\">\u002F**\n     * 年龄\n     *\u002F\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 comment\">\u002F**\n     * 性别\n     *\u002F\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\n    \u003Cspan class=\"token comment\">\u002F**\n     * 逻辑删除\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@TableLogic\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> isDeleted\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>注意，Mybatis Plus 提供了 \u003Ccode>@TableLogic\u003C\u002Fcode> 逻辑删除注解，只要添加在相关字段上，即可拥有逻辑删除功能。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@Data\u003C\u002Fcode> \u003Ccode>@Builder\u003C\u002Fcode> \u003Ccode>@AllArgsConstructor\u003C\u002Fcode> \u003Ccode>@NoArgsConstructor\u003C\u002Fcode> 都是 Lombok 注解，偷懒用的，加上它即编译自动添加 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 、\u003Ccode>类构造器\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\u003Ch3 id=\"toc-6\">单元测试\u003C\u002Fh3>\n\u003Cp>完成前面的工作后，我们新建单元测试，看看好不好使：\u003C\u002Fp>\n\u003Ch4 id=\"toc-7\">新增数据\u003C\u002Fh4>\n\u003Cp>新增一条测试数据，为后面测试做准备：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Test%0Avoid%20testTableLogic()%20%7B%0A%20%20%20%20%2F%2F%20%E6%B7%BB%E5%8A%A0%E6%B5%8B%E8%AF%95%E6%95%B0%E6%8D%AE%0A%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%20%20%20%20.name(%22%E5%BC%A0%E4%B8%89%22)%0A%20%20%20%20%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%20%20%20%20.gender(1)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.build()%3B%0A%20%20%20%20userMapper.insert(user)%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\">@Test\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\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 添加测试数据\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    userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">insert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-8\">修改数据\u003C\u002Fh3>\n\u003Cp>修改记录，看看实际执行的 SQL 是什么：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testTableLogic()%20%7B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E4%BF%AE%E6%94%B9%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder().id(1L).name(%22www.mashangan.com%22).build()%3B%0A%20%20%20%20%20%20%20%20userMapper.updateById(user)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\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 ID 修改记录\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>\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>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"www.mashangan.com\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">build\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行单元测试，实际执行 SQL 如下，可以看到自动附带上了逻辑删除字段的条件 \u003Ccode>is_deleted = 0\u003C\u002Fcode>：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167342410850389-rEGQ.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>再来看看根据 Wrapper 条件构造器来修改记录：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testTableLogic()%20%7B%0A%20%20%20%20%20%20%20%20User%20user1%20%3D%20User.builder().name(%22www.mashangan.com%22).build()%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E4%BF%AE%E6%94%B9%20name%20%E7%AD%89%E4%BA%8E%20%E5%BC%A0%E4%B8%89%20%E7%9A%84%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20UpdateWrapper%3CUser%3E%20wrapper%20%3D%20new%20UpdateWrapper%3C%3E()%3B%0A%20%20%20%20%20%20%20%20wrapper.eq(%22name%22%2C%20%22%E5%BC%A0%E4%B8%89%22)%3B%0A%20%20%20%20%20%20%20%20userMapper.update(user1%2C%20wrapper)%3B%0A%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\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> user1 \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">builder\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"www.mashangan.com\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">build\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 修改 name 等于 张三 的记录\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">UpdateWrapper\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> wrapper \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">UpdateWrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        wrapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">eq\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"name\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">update\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user1\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> wrapper\u003Cspan class=\"token punctuation\">)\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>执行单元测试，实际执行 SQL 如下, 同样也是 OK 的：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167342448565316-QpIC.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Ch3 id=\"toc-9\">删除记录\u003C\u002Fh3>\n\u003Cp>最后看看，删除记录是不是执行了更新操作，将 \u003Ccode>is_deleted\u003C\u002Fcode> 字段更新为了 \u003Ccode>1\u003C\u002Fcode> , 单元测试代码如下:\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testTableLogic()%20%7B%0A%09%09%2F%2F%20%E5%88%A0%E9%99%A4%20ID%20%E4%B8%BA%201%20%E7%9A%84%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20userMapper.deleteById(1L)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\t\t\u003Cspan class=\"token comment\">\u002F\u002F 删除 ID 为 1 的记录\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\">1L\u003C\u002Fspan>\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>控制台打印 SQL 如下, 效果完美：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167342473334839-NWKy.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Ch2 id=\"toc-10\">结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们了解了什么是逻辑删除，以及使用逻辑删除的好处，最后演示了 Mybatis Plus 如何实现逻辑删除，还是非常方便的，简简单单一个注解就搞定了。\u003C\u002Fp>","\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何通过 Mybatis Plus 实现逻辑删除功能。\u003C\u002Fp>\n\u003Ch2>什么是逻辑删除？\u003C\u002Fh2>\n\u003Cp>讲逻辑删除之前，先说说\u003Cem>物理删除\u003C\u002Fem>。当我们想要删除数据库中的数据，都会执行一条 \u003Ccode>delete\u003C\u002Fcode> 语句，执行成功后，会将相关数据彻底从磁盘中删除掉，这种我们称之为物理删除。\u003C\u002Fp>\n\u003Cp>\u003Cstrong>逻辑删除其实并不是真正意义上的删除，它其实一条更新语句。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>通常做法是在表中新增一个 \u003Ccode>is_deleted\u003C\u002Fcode> 字段，用来标识该记录的状态，默认值为 \u003Ccode>0\u003C\u002Fcode>, 表示未删除状态，执行逻辑删除后，会将该字段更新为 \u003Ccode>1\u003C\u002Fcode> , 表示已被删除。当然，查询的时候也会带上条件 \u003Ccode>where is_deleted = 0\u003C\u002Fcode>, 只会查询状态未被删除的记录。\u003C\u002Fp>\n\u003Cp>举个栗子，假设我跳槽了一个新公司，入职后第一天，都会在公司的 OA 系统中录入员工信息，并分配了一个员工工号，结果我干一个星期，发现这个公司代码写的贼烂，坑贼多，考虑再三又离职了，这时候人事会将我从 OA 系统的员工库中进行删除，这种情况也是逻辑删除，实际上即时你离职了，还是可以从历史员工库中调出来查看。\u003C\u002Fp>\n\u003Ch2>为什么需要逻辑删除？\u003C\u002Fh2>\n\u003Cp>逻辑删除的好处是：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>方便恢复数据\u003C\u002Fstrong>（比如我想明白了，重新回公司入职，更新一个数据状态就行，工号还是那个工号）；\u003C\u002Fli>\n\u003Cli>\u003Cstrong>数据有挖掘价值\u003C\u002Fstrong>（比如电商平台的订单，你虽然手动删除了订单，但是后台并不会删除，还会通过这些订单进行分析，给用户打标签，从而推荐给用户相类似的商品）\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP : 要不要使用逻辑删除，得结合数据价值来看，如果是没有用的数据，还是物理删除比较好，能够节省磁盘空间。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2>Mybatis Plus 实现逻辑删除\u003C\u002Fh2>\n\u003Cp>好了，了解完逻辑删除的相关概念，我们来看看 Mybatis Plus 如何实现逻辑删除。\u003C\u002Fp>\n\u003Ch3>新建测试表\u003C\u002Fh3>\n\u003Cp>删除前面小节中用户表，重新创建一张带有逻辑删除字段的用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>最佳实践：逻辑删除字段请添加默认值 \u003Ccode>0\u003C\u002Fcode>，防止后面新增数据时，还需要手动设置。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cpre>\u003Ccode>CREATE TABLE `t_user` (\n  `id` bigint(20) unsigned NOT NULL AUTO_INCREMENT COMMENT '主键ID',\n  `name` varchar(30) COLLATE utf8mb4_bin NOT NULL DEFAULT '' COMMENT '姓名',\n  `age` int(11) DEFAULT NULL COMMENT '年龄',\n  `gender` tinyint(2) NOT NULL DEFAULT 0 COMMENT '性别，0：女 1：男',\n  `is_deleted` tinyint(2) NOT NULL DEFAULT 0 COMMENT '逻辑删除(0：未删除，1:已删除)',\t\n  PRIMARY KEY (`id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_bin COMMENT='用户表';\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>实体类\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>model\u003C\u002Fcode> 包下创建 \u003Ccode>User\u003C\u002Fcode> 实体类：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>\u002F**\n * @author: 张三\n * @date: 2022-12-13 14:13\n * @version: v1.0.0\n * @description: TODO\n **\u002F\n@Data\n@Builder\n@AllArgsConstructor\n@NoArgsConstructor\n@TableName("t_user")\npublic class User {\n    \u002F**\n     * 主键 ID\n     *\u002F\n    @TableId(value = "id", type = IdType.AUTO)\n    private Long id;\n    \u002F**\n     * 姓名\n     *\u002F\n    private String name;\n    \u002F**\n     * 年龄\n     *\u002F\n    private Integer age;\n    \u002F**\n     * 性别\n     *\u002F\n    private Integer gender;\n\n    \u002F**\n     * 逻辑删除\n     *\u002F\n    @TableLogic\n    private Integer isDeleted;\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>注意，Mybatis Plus 提供了 \u003Ccode>@TableLogic\u003C\u002Fcode> 逻辑删除注解，只要添加在相关字段上，即可拥有逻辑删除功能。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@Data\u003C\u002Fcode> \u003Ccode>@Builder\u003C\u002Fcode> \u003Ccode>@AllArgsConstructor\u003C\u002Fcode> \u003Ccode>@NoArgsConstructor\u003C\u002Fcode> 都是 Lombok 注解，偷懒用的，加上它即编译自动添加 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 、\u003Ccode>类构造器\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\u003Ch3>单元测试\u003C\u002Fh3>\n\u003Cp>完成前面的工作后，我们新建单元测试，看看好不好使：\u003C\u002Fp>\n\u003Ch4>新增数据\u003C\u002Fh4>\n\u003Cp>新增一条测试数据，为后面测试做准备：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@Test\nvoid testTableLogic() {\n    \u002F\u002F 添加测试数据\n    User user = User.builder()\n                    .name("张三")\n                    .age(30)\n                    .gender(1)\n                    .build();\n    userMapper.insert(user);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Ch3>修改数据\u003C\u002Fh3>\n\u003Cp>修改记录，看看实际执行的 SQL 是什么：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>    @Test\n    void testTableLogic() {\n        \u002F\u002F 根据 ID 修改记录\n        User user = User.builder().id(1L).name("www.mashangan.com").build();\n        userMapper.updateById(user);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下，可以看到自动附带上了逻辑删除字段的条件 \u003Ccode>is_deleted = 0\u003C\u002Fcode>：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167342410850389-rEGQ.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>再来看看根据 Wrapper 条件构造器来修改记录：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>    @Test\n    void testTableLogic() {\n        User user1 = User.builder().name("www.mashangan.com").build();\n        \u002F\u002F 修改 name 等于 张三 的记录\n        UpdateWrapper<User> wrapper = new UpdateWrapper<>();\n        wrapper.eq("name", "张三");\n        userMapper.update(user1, wrapper);\n\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下, 同样也是 OK 的：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167342448565316-QpIC.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Ch3>删除记录\u003C\u002Fh3>\n\u003Cp>最后看看，删除记录是不是执行了更新操作，将 \u003Ccode>is_deleted\u003C\u002Fcode> 字段更新为了 \u003Ccode>1\u003C\u002Fcode> , 单元测试代码如下:\u003C\u002Fp>\n\u003Cpre>\u003Ccode>    @Test\n    void testTableLogic() {\n\t\t\u002F\u002F 删除 ID 为 1 的记录\n        userMapper.deleteById(1L);\n    }\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>控制台打印 SQL 如下, 效果完美：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167342473334839-NWKy.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Ch2>结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们了解了什么是逻辑删除，以及使用逻辑删除的好处，最后演示了 Mybatis Plus 如何实现逻辑删除，还是非常方便的，简简单单一个注解就搞定了。\u003C\u002Fp>\n13:T57a3,\u003Ch2 id=\"toc-0\">前言\u003C\u002Fh2>\n\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>本小节中，我们将学习如何通过 Mybatis Plus 实现逻辑删除功能。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">什么是逻辑删除？\u003C\u002Fh2>\n\u003Cp>讲逻辑删除之前，先说说\u003Cem>物理删除\u003C\u002Fem>。当我们想要删除数据库中的数据，都会执行一条 \u003Ccode>delete\u003C\u002Fcode> 语句，执行成功后，会将相关数据彻底从磁盘中删除掉，这种我们称之为物理删除。\u003C\u002Fp>\n\u003Cp>\u003Cstrong>逻辑删除其实并不是真正意义上的删除，它其实一条更新语句。\u003C\u002Fstrong>\u003C\u002Fp>\n\u003Cp>通常做法是在表中新增一个 \u003Ccode>is_deleted\u003C\u002Fcode> 字段，用来标识该记录的状态，默认值为 \u003Ccode>0\u003C\u002Fcode>, 表示未删除状态，执行逻辑删除后，会将该字段更新为 \u003Ccode>1\u003C\u002Fcode> , 表示已被删除。当然，查询的时候也会带上条件 \u003Ccode>where is_deleted = 0\u003C\u002Fcode>, 只会查询状态未被删除的记录。\u003C\u002Fp>\n\u003Cp>举个栗子，假设我跳槽了一个新公司，入职后第一天，都会在公司的 OA 系统中录入员工信息，并分配了一个员工工号，结果我干一个星期，发现这个公司代码写的贼烂，坑贼多，考虑再三又离职了，这时候人事会将我从 OA 系统的员工库中进行删除，这种情况也是逻辑删除，实际上即时你离职了，还是可以从历史员工库中调出来查看。\u003C\u002Fp>\n\u003Ch2 id=\"toc-2\">为什么需要逻辑删除？\u003C\u002Fh2>\n\u003Cp>逻辑删除的好处是：\u003C\u002Fp>\n\u003Cul>\n\u003Cli>\u003Cstrong>方便恢复数据\u003C\u002Fstrong>（比如我想明白了，重新回公司入职，更新一个数据状态就行，工号还是那个工号）；\u003C\u002Fli>\n\u003Cli>\u003Cstrong>数据有挖掘价值\u003C\u002Fstrong>（比如电商平台的订单，你虽然手动删除了订单，但是后台并不会删除，还会通过这些订单进行分析，给用户打标签，从而推荐给用户相类似的商品）\u003C\u002Fli>\n\u003C\u002Ful>\n\u003Cblockquote>\n\u003Cp>TIP : 要不要使用逻辑删除，得结合数据价值来看，如果是没有用的数据，还是物理删除比较好，能够节省磁盘空间。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Ch2 id=\"toc-3\">Mybatis Plus 实现逻辑删除\u003C\u002Fh2>\n\u003Cp>好了，了解完逻辑删除的相关概念，我们来看看 Mybatis Plus 如何实现逻辑删除。\u003C\u002Fp>\n\u003Ch3 id=\"toc-4\">新建测试表\u003C\u002Fh3>\n\u003Cp>删除前面小节中用户表，重新创建一张带有逻辑删除字段的用户表，Schema 建表脚本如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>最佳实践：逻辑删除字段请添加默认值 \u003Ccode>0\u003C\u002Fcode>，防止后面新增数据时，还需要手动设置。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cdiv class=\"language-sql\" data-ext=\"sql\" data-code=\"CREATE%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)%20COLLATE%20utf8mb4_bin%20NOT%20NULL%20DEFAULT%20''%20COMMENT%20'%E5%A7%93%E5%90%8D'%2C%0A%20%20%60age%60%20int(11)%20DEFAULT%20NULL%20COMMENT%20'%E5%B9%B4%E9%BE%84'%2C%0A%20%20%60gender%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%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%20%60is_deleted%60%20tinyint(2)%20NOT%20NULL%20DEFAULT%200%20COMMENT%20'%E9%80%BB%E8%BE%91%E5%88%A0%E9%99%A4(0%EF%BC%9A%E6%9C%AA%E5%88%A0%E9%99%A4%EF%BC%8C1%3A%E5%B7%B2%E5%88%A0%E9%99%A4)'%2C%09%0A%20%20PRIMARY%20KEY%20(%60id%60)%0A)%20ENGINE%3DInnoDB%20DEFAULT%20CHARSET%3Dutf8mb4%20COLLATE%3Dutf8mb4_bin%20COMMENT%3D'%E7%94%A8%E6%88%B7%E8%A1%A8'%3B%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-sql\">\u003Cspan class=\"token keyword\">CREATE\u003C\u002Fspan> \u003Cspan class=\"token keyword\">TABLE\u003C\u002Fspan> \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>t_user\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 keyword\">COLLATE\u003C\u002Fspan> utf8mb4_bin \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token string\">''\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'姓名'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>age\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">int\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">11\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">COMMENT\u003C\u002Fspan> \u003Cspan class=\"token string\">'年龄'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\n  \u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>gender\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan> \u003Cspan class=\"token keyword\">tinyint\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token number\">2\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token operator\">NOT\u003C\u002Fspan> \u003Cspan class=\"token boolean\">NULL\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token 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 identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>is_deleted\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\">'逻辑删除(0：未删除，1:已删除)'\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan>\t\n  \u003Cspan class=\"token keyword\">PRIMARY\u003C\u002Fspan> \u003Cspan class=\"token keyword\">KEY\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token identifier\">\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>id\u003Cspan class=\"token punctuation\">`\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token keyword\">ENGINE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>\u003Cspan class=\"token keyword\">InnoDB\u003C\u002Fspan> \u003Cspan class=\"token keyword\">DEFAULT\u003C\u002Fspan> \u003Cspan class=\"token keyword\">CHARSET\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4 \u003Cspan class=\"token keyword\">COLLATE\u003C\u002Fspan>\u003Cspan class=\"token operator\">=\u003C\u002Fspan>utf8mb4_bin \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\u003Ch3 id=\"toc-5\">实体类\u003C\u002Fh3>\n\u003Cp>在 \u003Ccode>model\u003C\u002Fcode> 包下创建 \u003Ccode>User\u003C\u002Fcode> 实体类：\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%202022-12-13%2014%3A13%0A%20*%20%40version%3A%20v1.0.0%0A%20*%20%40description%3A%20TODO%0A%20**%2F%0A%40Data%0A%40Builder%0A%40AllArgsConstructor%0A%40NoArgsConstructor%0A%40TableName(%22t_user%22)%0Apublic%20class%20User%20%7B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E4%B8%BB%E9%94%AE%20ID%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40TableId(value%20%3D%20%22id%22%2C%20type%20%3D%20IdType.AUTO)%0A%20%20%20%20private%20Long%20id%3B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E5%A7%93%E5%90%8D%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20String%20name%3B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E5%B9%B4%E9%BE%84%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20Integer%20age%3B%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E6%80%A7%E5%88%AB%0A%20%20%20%20%20*%2F%0A%20%20%20%20private%20Integer%20gender%3B%0A%0A%20%20%20%20%2F**%0A%20%20%20%20%20*%20%E9%80%BB%E8%BE%91%E5%88%A0%E9%99%A4%0A%20%20%20%20%20*%2F%0A%20%20%20%20%40TableLogic%0A%20%20%20%20private%20Integer%20isDeleted%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 comment\">\u002F**\n * @author: 张三\n * @date: 2022-12-13 14:13\n * @version: v1.0.0\n * @description: TODO\n **\u002F\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@Data\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@Builder\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@AllArgsConstructor\u003C\u002Fspan>\n\u003Cspan class=\"token annotation punctuation\">@NoArgsConstructor\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 comment\">\u002F**\n     * 主键 ID\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@TableId\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>value \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"id\"\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 comment\">\u002F**\n     * 姓名\n     *\u002F\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 comment\">\u002F**\n     * 年龄\n     *\u002F\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 comment\">\u002F**\n     * 性别\n     *\u002F\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\n    \u003Cspan class=\"token comment\">\u002F**\n     * 逻辑删除\n     *\u002F\u003C\u002Fspan>\n    \u003Cspan class=\"token annotation punctuation\">@TableLogic\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">private\u003C\u002Fspan> \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> isDeleted\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>注意，Mybatis Plus 提供了 \u003Ccode>@TableLogic\u003C\u002Fcode> 逻辑删除注解，只要添加在相关字段上，即可拥有逻辑删除功能。\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : \u003Ccode>@Data\u003C\u002Fcode> \u003Ccode>@Builder\u003C\u002Fcode> \u003Ccode>@AllArgsConstructor\u003C\u002Fcode> \u003Ccode>@NoArgsConstructor\u003C\u002Fcode> 都是 Lombok 注解，偷懒用的，加上它即编译自动添加 \u003Ccode>getXXX\u002FsetXXX\u003C\u002Fcode> 、\u003Ccode>类构造器\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\u003Ch3 id=\"toc-6\">单元测试\u003C\u002Fh3>\n\u003Cp>完成前面的工作后，我们新建单元测试，看看好不好使：\u003C\u002Fp>\n\u003Ch4 id=\"toc-7\">新增数据\u003C\u002Fh4>\n\u003Cp>新增一条测试数据，为后面测试做准备：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Test%0Avoid%20testTableLogic()%20%7B%0A%20%20%20%20%2F%2F%20%E6%B7%BB%E5%8A%A0%E6%B5%8B%E8%AF%95%E6%95%B0%E6%8D%AE%0A%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%20%20%20%20.name(%22%E5%BC%A0%E4%B8%89%22)%0A%20%20%20%20%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%20%20%20%20.gender(1)%0A%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20%20.build()%3B%0A%20%20%20%20userMapper.insert(user)%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\">@Test\u003C\u002Fspan>\n\u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\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 添加测试数据\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    userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">insert\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Ch3 id=\"toc-8\">修改数据\u003C\u002Fh3>\n\u003Cp>修改记录，看看实际执行的 SQL 是什么：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testTableLogic()%20%7B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E6%A0%B9%E6%8D%AE%20ID%20%E4%BF%AE%E6%94%B9%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20User%20user%20%3D%20User.builder().id(1L).name(%22www.mashangan.com%22).build()%3B%0A%20%20%20%20%20%20%20%20userMapper.updateById(user)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\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 ID 修改记录\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>\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>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"www.mashangan.com\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">build\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行单元测试，实际执行 SQL 如下，可以看到自动附带上了逻辑删除字段的条件 \u003Ccode>is_deleted = 0\u003C\u002Fcode>：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167342410850389-rEGQ.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>再来看看根据 Wrapper 条件构造器来修改记录：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testTableLogic()%20%7B%0A%20%20%20%20%20%20%20%20User%20user1%20%3D%20User.builder().name(%22www.mashangan.com%22).build()%3B%0A%20%20%20%20%20%20%20%20%2F%2F%20%E4%BF%AE%E6%94%B9%20name%20%E7%AD%89%E4%BA%8E%20%E5%BC%A0%E4%B8%89%20%E7%9A%84%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20UpdateWrapper%3CUser%3E%20wrapper%20%3D%20new%20UpdateWrapper%3C%3E()%3B%0A%20%20%20%20%20%20%20%20wrapper.eq(%22name%22%2C%20%22%E5%BC%A0%E4%B8%89%22)%3B%0A%20%20%20%20%20%20%20%20userMapper.update(user1%2C%20wrapper)%3B%0A%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\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> user1 \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">builder\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">name\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"www.mashangan.com\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">build\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        \u003Cspan class=\"token comment\">\u002F\u002F 修改 name 等于 张三 的记录\u003C\u002Fspan>\n        \u003Cspan class=\"token class-name\">UpdateWrapper\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> wrapper \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">new\u003C\u002Fspan> \u003Cspan class=\"token class-name\">UpdateWrapper\u003C\u002Fspan>\u003Cspan class=\"token generics\">\u003Cspan class=\"token punctuation\"><\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">>\u003C\u002Fspan>\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        wrapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">eq\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"name\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n        userMapper\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">update\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>user1\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> wrapper\u003Cspan class=\"token punctuation\">)\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>执行单元测试，实际执行 SQL 如下, 同样也是 OK 的：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167342448565316-QpIC.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Ch3 id=\"toc-9\">删除记录\u003C\u002Fh3>\n\u003Cp>最后看看，删除记录是不是执行了更新操作，将 \u003Ccode>is_deleted\u003C\u002Fcode> 字段更新为了 \u003Ccode>1\u003C\u002Fcode> , 单元测试代码如下:\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%20%20%20%20%40Test%0A%20%20%20%20void%20testTableLogic()%20%7B%0A%09%09%2F%2F%20%E5%88%A0%E9%99%A4%20ID%20%E4%B8%BA%201%20%E7%9A%84%E8%AE%B0%E5%BD%95%0A%20%20%20%20%20%20%20%20userMapper.deleteById(1L)%3B%0A%20%20%20%20%7D%0A\">\n        \u003Cbutton class=\"vp-copy-code-button\" data-copy data-copied=\"已复制\" aria-label=\"复制代码\">\u003C\u002Fbutton>\n        \u003Cpre>\u003Ccode class=\"language-java\">    \u003Cspan class=\"token annotation punctuation\">@Test\u003C\u002Fspan>\n    \u003Cspan class=\"token keyword\">void\u003C\u002Fspan> \u003Cspan class=\"token function\">testTableLogic\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">{\u003C\u002Fspan>\n\t\t\u003Cspan class=\"token comment\">\u002F\u002F 删除 ID 为 1 的记录\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\">1L\u003C\u002Fspan>\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>控制台打印 SQL 如下, 效果完美：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167342473334839-NWKy.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Ch2 id=\"toc-10\">结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们了解了什么是逻辑删除，以及使用逻辑删除的好处，最后演示了 Mybatis Plus 如何实现逻辑删除，还是非常方便的，简简单单一个注解就搞定了。\u003C\u002Fp>"]