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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":100,"creationTimestamp":101},{"title":103,"slug":104,"cover":105,"excerpt":487,"publishTime":108,"categories":488,"tags":489,"priority":27,"pinned":93,"deleted":93,"visible":111,"allowComment":112},{"raw":107,"autoGenerate":93},[87],[],{"permalink":114,"excerpt":107,"lastModifyTime":115,"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>前面小节中，我们已经学习了 Mybatis Plus 中使用频率超高的条件构造器\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>，细心的小伙伴应该注意到，很多条件判断方法都提供了一个带有 \u003Ccode>boolean\u003C\u002Fcode> 类型 \u003Ccode>condition\u003C\u002Fcode> 参数的重载方法，如下面的截图，这玩意到底是干嘛用的呢？\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167344117940263-vNin.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>本文我们就结合具体示例详细讲一讲。\u003C\u002Fp>\n\u003Ch2>Wrapper 中的 condition\u003C\u002Fh2>\n\u003Cp>布尔类型的 \u003Ccode>condition\u003C\u002Fcode> 顾名思义就是\u003Cstrong>条件判断\u003C\u002Fstrong>。举个栗子，实际项目中，如果是一个查询分页数据的页面，用户通常可以手动选择多个条件进行查询，那么后台的代码实现上，Wrapper 条件就是动态组装的，需要对每一个可能会出现的条件进行判断，伪代码大致如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>if (字段1 != null) {\n  wrapper.eq("name", "张三")\n}\n\nif (字段2 != null) {\n  wrapper.ge("age", 20)\n}\n\n\u002F\u002F ...省略\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>如何 \u003Ccode>if\u003C\u002Fcode> 判断只有几个还好，一旦给你来 10 个，你就会发现代码又臭又长，于是救世主 \u003Ccode>condition\u003C\u002Fcode> 出现了，它可以帮助我们省略冗长的 \u003Ccode>if\u003C\u002Fcode> 代码，让动态组装的判断更加优雅。\u003C\u002Fp>\n\u003Cp>举个示例，假设分页接口中，前端可能传过来的动态条件字段为姓名，年龄（范围类型），那么可以通过 \u003Ccode>condition\u003C\u002Fcode> 可以如下实现：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@Test\nvoid testCondition() {\n    \u002F\u002F 模拟前端传过来的数据\n    String name = "张三";\n    \u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\n    Integer ageStart = 20;\n    Integer ageEnd = 30;\n\n    QueryWrapper<User> wrapper = new QueryWrapper<>();\n    wrapper.eq(StringUtils.isNotBlank(name), "name", name)\n    .ge(ageStart != null, "age", ageStart)\n    .le(ageEnd != null, "name", ageEnd);\n\n    List<User> users = userMapper.selectList(wrapper);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>Lambda 形式如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 推荐使用 Lambda 形式，可以不用手动填写字段名。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cpre>\u003Ccode>@Test\nvoid testCondition() {\n    \u002F\u002F 模拟前端传过来的数据\n    String name = "张三";\n    \u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\n    Integer ageStart = 20;\n    Integer ageEnd = 30;\n\n    LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();\n    wrapper.eq(StringUtils.isNotBlank(name), User::getName, name)\n    .ge(ageStart != null, User::getAge, ageStart)\n    .le(ageEnd != null, User::getAge, ageEnd);\n\n    List<User> users = userMapper.selectList(wrapper);\n    users.forEach(System.out::println);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167344247547271-zSIv.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>功能正常，相比较上面需要写一堆 \u003Ccode>if\u003C\u002Fcode> 判断，我们可以直接将判断条件传给 \u003Ccode>condition\u003C\u002Fcode> 参数，代码看上去舒服多了，有木有~\u003C\u002Fp>\n\u003Ch2>结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们结合代码示例，详细讲解了 Mybatis Plus 中的条件构造器 Wrapper 方法中的 \u003Ccode>condition\u003C\u002Fcode> 是什么，以及如何使用，希望小伙伴在实际项目开发中，也要善用它，让代码看起来更加优雅。\u003C\u002Fp>\n13:T3833,\u003Ch2 id=\"toc-0\">前言\u003C\u002Fh2>\n\u003Cp>\u003C\u002Fp>\n\u003Cp>前面小节中，我们已经学习了 Mybatis Plus 中使用频率超高的条件构造器\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>，细心的小伙伴应该注意到，很多条件判断方法都提供了一个带有 \u003Ccode>boolean\u003C\u002Fcode> 类型 \u003Ccode>condition\u003C\u002Fcode> 参数的重载方法，如下面的截图，这玩意到底是干嘛用的呢？\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167344117940263-vNin.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>本文我们就结合具体示例详细讲一讲。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">Wrapper 中的 condition\u003C\u002Fh2>\n\u003Cp>布尔类型的 \u003Ccode>condition\u003C\u002Fcode> 顾名思义就是\u003Cstrong>条件判断\u003C\u002Fstrong>。举个栗子，实际项目中，如果是一个查询分页数据的页面，用户通常可以手动选择多个条件进行查询，那么后台的代码实现上，Wrapper 条件就是动态组装的，需要对每一个可能会出现的条件进行判断，伪代码大致如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"if%20(%E5%AD%97%E6%AE%B51%20!%3D%20null)%20%7B%0A%20%20wrapper.eq(%22name%22%2C%20%22%E5%BC%A0%E4%B8%89%22)%0A%7D%0A%0Aif%20(%E5%AD%97%E6%AE%B52%20!%3D%20null)%20%7B%0A%20%20wrapper.ge(%22age%22%2C%2020)%0A%7D%0A%0A%2F%2F%20...%E7%9C%81%E7%95%A5%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\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>字段\u003Cspan class=\"token number\">1\u003C\u002Fspan> \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\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>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>字段\u003Cspan class=\"token number\">2\u003C\u002Fspan> \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\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\">ge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"age\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n\u003Cspan class=\"token comment\">\u002F\u002F ...省略\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>如何 \u003Ccode>if\u003C\u002Fcode> 判断只有几个还好，一旦给你来 10 个，你就会发现代码又臭又长，于是救世主 \u003Ccode>condition\u003C\u002Fcode> 出现了，它可以帮助我们省略冗长的 \u003Ccode>if\u003C\u002Fcode> 代码，让动态组装的判断更加优雅。\u003C\u002Fp>\n\u003Cp>举个示例，假设分页接口中，前端可能传过来的动态条件字段为姓名，年龄（范围类型），那么可以通过 \u003Ccode>condition\u003C\u002Fcode> 可以如下实现：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Test%0Avoid%20testCondition()%20%7B%0A%20%20%20%20%2F%2F%20%E6%A8%A1%E6%8B%9F%E5%89%8D%E7%AB%AF%E4%BC%A0%E8%BF%87%E6%9D%A5%E7%9A%84%E6%95%B0%E6%8D%AE%0A%20%20%20%20String%20name%20%3D%20%22%E5%BC%A0%E4%B8%89%22%3B%0A%20%20%20%20%2F%2F%20%E5%B9%B4%E9%BE%84%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E%2020%20%E4%B8%94%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E%2030%20%E7%9A%84%E7%94%A8%E6%88%B7%0A%20%20%20%20Integer%20ageStart%20%3D%2020%3B%0A%20%20%20%20Integer%20ageEnd%20%3D%2030%3B%0A%0A%20%20%20%20QueryWrapper%3CUser%3E%20wrapper%20%3D%20new%20QueryWrapper%3C%3E()%3B%0A%20%20%20%20wrapper.eq(StringUtils.isNotBlank(name)%2C%20%22name%22%2C%20name)%0A%20%20%20%20.ge(ageStart%20!%3D%20null%2C%20%22age%22%2C%20ageStart)%0A%20%20%20%20.le(ageEnd%20!%3D%20null%2C%20%22name%22%2C%20ageEnd)%3B%0A%0A%20%20%20%20List%3CUser%3E%20users%20%3D%20userMapper.selectList(wrapper)%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\">testCondition\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 模拟前端传过来的数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> name \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageStart \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageEnd \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token class-name\">QueryWrapper\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\">QueryWrapper\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 class-name\">StringUtils\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotBlank\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"name\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">ge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageStart \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"age\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageStart\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">le\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageEnd \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"name\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageEnd\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\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> users \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>wrapper\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>Lambda 形式如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 推荐使用 Lambda 形式，可以不用手动填写字段名。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Test%0Avoid%20testCondition()%20%7B%0A%20%20%20%20%2F%2F%20%E6%A8%A1%E6%8B%9F%E5%89%8D%E7%AB%AF%E4%BC%A0%E8%BF%87%E6%9D%A5%E7%9A%84%E6%95%B0%E6%8D%AE%0A%20%20%20%20String%20name%20%3D%20%22%E5%BC%A0%E4%B8%89%22%3B%0A%20%20%20%20%2F%2F%20%E5%B9%B4%E9%BE%84%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E%2020%20%E4%B8%94%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E%2030%20%E7%9A%84%E7%94%A8%E6%88%B7%0A%20%20%20%20Integer%20ageStart%20%3D%2020%3B%0A%20%20%20%20Integer%20ageEnd%20%3D%2030%3B%0A%0A%20%20%20%20LambdaQueryWrapper%3CUser%3E%20wrapper%20%3D%20new%20LambdaQueryWrapper%3C%3E()%3B%0A%20%20%20%20wrapper.eq(StringUtils.isNotBlank(name)%2C%20User%3A%3AgetName%2C%20name)%0A%20%20%20%20.ge(ageStart%20!%3D%20null%2C%20User%3A%3AgetAge%2C%20ageStart)%0A%20%20%20%20.le(ageEnd%20!%3D%20null%2C%20User%3A%3AgetAge%2C%20ageEnd)%3B%0A%0A%20%20%20%20List%3CUser%3E%20users%20%3D%20userMapper.selectList(wrapper)%3B%0A%20%20%20%20users.forEach(System.out%3A%3Aprintln)%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\">testCondition\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 模拟前端传过来的数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> name \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageStart \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageEnd \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token class-name\">LambdaQueryWrapper\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\">LambdaQueryWrapper\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 class-name\">StringUtils\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotBlank\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">getName\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">ge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageStart \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">getAge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageStart\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">le\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageEnd \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">getAge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageEnd\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\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> users \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>wrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    users\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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167344247547271-zSIv.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>功能正常，相比较上面需要写一堆 \u003Ccode>if\u003C\u002Fcode> 判断，我们可以直接将判断条件传给 \u003Ccode>condition\u003C\u002Fcode> 参数，代码看上去舒服多了，有木有~\u003C\u002Fp>\n\u003Ch2 id=\"toc-2\">结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们结合代码示例，详细讲解了 Mybatis Plus 中的条件构造器 Wrapper 方法中的 \u003Ccode>condition\u003C\u002Fcode> 是什么，以及如何使用，希望小伙伴在实际项目开发中，也要善用它，让代码看起来更加优雅。\u003C\u002Fp>","\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>前面小节中，我们已经学习了 Mybatis Plus 中使用频率超高的条件构造器\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>，细心的小伙伴应该注意到，很多条件判断方法都提供了一个带有 \u003Ccode>boolean\u003C\u002Fcode> 类型 \u003Ccode>condition\u003C\u002Fcode> 参数的重载方法，如下面的截图，这玩意到底是干嘛用的呢？\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167344117940263-vNin.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>本文我们就结合具体示例详细讲一讲。\u003C\u002Fp>\n\u003Ch2>Wrapper 中的 condition\u003C\u002Fh2>\n\u003Cp>布尔类型的 \u003Ccode>condition\u003C\u002Fcode> 顾名思义就是\u003Cstrong>条件判断\u003C\u002Fstrong>。举个栗子，实际项目中，如果是一个查询分页数据的页面，用户通常可以手动选择多个条件进行查询，那么后台的代码实现上，Wrapper 条件就是动态组装的，需要对每一个可能会出现的条件进行判断，伪代码大致如下：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>if (字段1 != null) {\n  wrapper.eq("name", "张三")\n}\n\nif (字段2 != null) {\n  wrapper.ge("age", 20)\n}\n\n\u002F\u002F ...省略\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>如何 \u003Ccode>if\u003C\u002Fcode> 判断只有几个还好，一旦给你来 10 个，你就会发现代码又臭又长，于是救世主 \u003Ccode>condition\u003C\u002Fcode> 出现了，它可以帮助我们省略冗长的 \u003Ccode>if\u003C\u002Fcode> 代码，让动态组装的判断更加优雅。\u003C\u002Fp>\n\u003Cp>举个示例，假设分页接口中，前端可能传过来的动态条件字段为姓名，年龄（范围类型），那么可以通过 \u003Ccode>condition\u003C\u002Fcode> 可以如下实现：\u003C\u002Fp>\n\u003Cpre>\u003Ccode>@Test\nvoid testCondition() {\n    \u002F\u002F 模拟前端传过来的数据\n    String name = "张三";\n    \u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\n    Integer ageStart = 20;\n    Integer ageEnd = 30;\n\n    QueryWrapper<User> wrapper = new QueryWrapper<>();\n    wrapper.eq(StringUtils.isNotBlank(name), "name", name)\n    .ge(ageStart != null, "age", ageStart)\n    .le(ageEnd != null, "name", ageEnd);\n\n    List<User> users = userMapper.selectList(wrapper);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>Lambda 形式如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 推荐使用 Lambda 形式，可以不用手动填写字段名。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cpre>\u003Ccode>@Test\nvoid testCondition() {\n    \u002F\u002F 模拟前端传过来的数据\n    String name = "张三";\n    \u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\n    Integer ageStart = 20;\n    Integer ageEnd = 30;\n\n    LambdaQueryWrapper<User> wrapper = new LambdaQueryWrapper<>();\n    wrapper.eq(StringUtils.isNotBlank(name), User::getName, name)\n    .ge(ageStart != null, User::getAge, ageStart)\n    .le(ageEnd != null, User::getAge, ageEnd);\n\n    List<User> users = userMapper.selectList(wrapper);\n    users.forEach(System.out::println);\n}\n\u003C\u002Fcode>\u003C\u002Fpre>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cimg src=\"\u002Fupload\u002F167344247547271-zSIv.jpg\" loading=\"lazy\">\n\u003C\u002Fp>\n\u003Cp>功能正常，相比较上面需要写一堆 \u003Ccode>if\u003C\u002Fcode> 判断，我们可以直接将判断条件传给 \u003Ccode>condition\u003C\u002Fcode> 参数，代码看上去舒服多了，有木有~\u003C\u002Fp>\n\u003Ch2>结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们结合代码示例，详细讲解了 Mybatis Plus 中的条件构造器 Wrapper 方法中的 \u003Ccode>condition\u003C\u002Fcode> 是什么，以及如何使用，希望小伙伴在实际项目开发中，也要善用它，让代码看起来更加优雅。\u003C\u002Fp>\n13:T3833,\u003Ch2 id=\"toc-0\">前言\u003C\u002Fh2>\n\u003Cp>大家好。\u003C\u002Fp>\n\u003Cp>前面小节中，我们已经学习了 Mybatis Plus 中使用频率超高的条件构造器\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>，细心的小伙伴应该注意到，很多条件判断方法都提供了一个带有 \u003Ccode>boolean\u003C\u002Fcode> 类型 \u003Ccode>condition\u003C\u002Fcode> 参数的重载方法，如下面的截图，这玩意到底是干嘛用的呢？\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167344117940263-vNin.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>本文我们就结合具体示例详细讲一讲。\u003C\u002Fp>\n\u003Ch2 id=\"toc-1\">Wrapper 中的 condition\u003C\u002Fh2>\n\u003Cp>布尔类型的 \u003Ccode>condition\u003C\u002Fcode> 顾名思义就是\u003Cstrong>条件判断\u003C\u002Fstrong>。举个栗子，实际项目中，如果是一个查询分页数据的页面，用户通常可以手动选择多个条件进行查询，那么后台的代码实现上，Wrapper 条件就是动态组装的，需要对每一个可能会出现的条件进行判断，伪代码大致如下：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"if%20(%E5%AD%97%E6%AE%B51%20!%3D%20null)%20%7B%0A%20%20wrapper.eq(%22name%22%2C%20%22%E5%BC%A0%E4%B8%89%22)%0A%7D%0A%0Aif%20(%E5%AD%97%E6%AE%B52%20!%3D%20null)%20%7B%0A%20%20wrapper.ge(%22age%22%2C%2020)%0A%7D%0A%0A%2F%2F%20...%E7%9C%81%E7%95%A5%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\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>字段\u003Cspan class=\"token number\">1\u003C\u002Fspan> \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\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>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n\u003Cspan class=\"token keyword\">if\u003C\u002Fspan> \u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>字段\u003Cspan class=\"token number\">2\u003C\u002Fspan> \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\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\">ge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>\u003Cspan class=\"token string\">\"age\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n\u003Cspan class=\"token punctuation\">}\u003C\u002Fspan>\n\n\u003Cspan class=\"token comment\">\u002F\u002F ...省略\u003C\u002Fspan>\n\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>如何 \u003Ccode>if\u003C\u002Fcode> 判断只有几个还好，一旦给你来 10 个，你就会发现代码又臭又长，于是救世主 \u003Ccode>condition\u003C\u002Fcode> 出现了，它可以帮助我们省略冗长的 \u003Ccode>if\u003C\u002Fcode> 代码，让动态组装的判断更加优雅。\u003C\u002Fp>\n\u003Cp>举个示例，假设分页接口中，前端可能传过来的动态条件字段为姓名，年龄（范围类型），那么可以通过 \u003Ccode>condition\u003C\u002Fcode> 可以如下实现：\u003C\u002Fp>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Test%0Avoid%20testCondition()%20%7B%0A%20%20%20%20%2F%2F%20%E6%A8%A1%E6%8B%9F%E5%89%8D%E7%AB%AF%E4%BC%A0%E8%BF%87%E6%9D%A5%E7%9A%84%E6%95%B0%E6%8D%AE%0A%20%20%20%20String%20name%20%3D%20%22%E5%BC%A0%E4%B8%89%22%3B%0A%20%20%20%20%2F%2F%20%E5%B9%B4%E9%BE%84%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E%2020%20%E4%B8%94%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E%2030%20%E7%9A%84%E7%94%A8%E6%88%B7%0A%20%20%20%20Integer%20ageStart%20%3D%2020%3B%0A%20%20%20%20Integer%20ageEnd%20%3D%2030%3B%0A%0A%20%20%20%20QueryWrapper%3CUser%3E%20wrapper%20%3D%20new%20QueryWrapper%3C%3E()%3B%0A%20%20%20%20wrapper.eq(StringUtils.isNotBlank(name)%2C%20%22name%22%2C%20name)%0A%20%20%20%20.ge(ageStart%20!%3D%20null%2C%20%22age%22%2C%20ageStart)%0A%20%20%20%20.le(ageEnd%20!%3D%20null%2C%20%22name%22%2C%20ageEnd)%3B%0A%0A%20%20%20%20List%3CUser%3E%20users%20%3D%20userMapper.selectList(wrapper)%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\">testCondition\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 模拟前端传过来的数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> name \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageStart \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageEnd \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token class-name\">QueryWrapper\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\">QueryWrapper\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 class-name\">StringUtils\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotBlank\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"name\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">ge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageStart \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"age\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageStart\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">le\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageEnd \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token string\">\"name\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageEnd\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\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> users \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>wrapper\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>Lambda 形式如下：\u003C\u002Fp>\n\u003Cblockquote>\n\u003Cp>TIP : 推荐使用 Lambda 形式，可以不用手动填写字段名。\u003C\u002Fp>\n\u003C\u002Fblockquote>\n\u003Cdiv class=\"language-java\" data-ext=\"java\" data-code=\"%40Test%0Avoid%20testCondition()%20%7B%0A%20%20%20%20%2F%2F%20%E6%A8%A1%E6%8B%9F%E5%89%8D%E7%AB%AF%E4%BC%A0%E8%BF%87%E6%9D%A5%E7%9A%84%E6%95%B0%E6%8D%AE%0A%20%20%20%20String%20name%20%3D%20%22%E5%BC%A0%E4%B8%89%22%3B%0A%20%20%20%20%2F%2F%20%E5%B9%B4%E9%BE%84%E5%A4%A7%E4%BA%8E%E7%AD%89%E4%BA%8E%2020%20%E4%B8%94%E5%B0%8F%E4%BA%8E%E7%AD%89%E4%BA%8E%2030%20%E7%9A%84%E7%94%A8%E6%88%B7%0A%20%20%20%20Integer%20ageStart%20%3D%2020%3B%0A%20%20%20%20Integer%20ageEnd%20%3D%2030%3B%0A%0A%20%20%20%20LambdaQueryWrapper%3CUser%3E%20wrapper%20%3D%20new%20LambdaQueryWrapper%3C%3E()%3B%0A%20%20%20%20wrapper.eq(StringUtils.isNotBlank(name)%2C%20User%3A%3AgetName%2C%20name)%0A%20%20%20%20.ge(ageStart%20!%3D%20null%2C%20User%3A%3AgetAge%2C%20ageStart)%0A%20%20%20%20.le(ageEnd%20!%3D%20null%2C%20User%3A%3AgetAge%2C%20ageEnd)%3B%0A%0A%20%20%20%20List%3CUser%3E%20users%20%3D%20userMapper.selectList(wrapper)%3B%0A%20%20%20%20users.forEach(System.out%3A%3Aprintln)%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\">testCondition\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 模拟前端传过来的数据\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">String\u003C\u002Fspan> name \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token string\">\"张三\"\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token comment\">\u002F\u002F 年龄大于等于 20 且小于等于 30 的用户\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageStart \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">20\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    \u003Cspan class=\"token class-name\">Integer\u003C\u002Fspan> ageEnd \u003Cspan class=\"token operator\">=\u003C\u002Fspan> \u003Cspan class=\"token number\">30\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\n    \u003Cspan class=\"token class-name\">LambdaQueryWrapper\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\">LambdaQueryWrapper\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 class-name\">StringUtils\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">isNotBlank\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">getName\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> name\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">ge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageStart \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">getAge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageStart\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\n    \u003Cspan class=\"token punctuation\">.\u003C\u002Fspan>\u003Cspan class=\"token function\">le\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">(\u003C\u002Fspan>ageEnd \u003Cspan class=\"token operator\">!=\u003C\u002Fspan> \u003Cspan class=\"token keyword\">null\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> \u003Cspan class=\"token class-name\">User\u003C\u002Fspan>\u003Cspan class=\"token operator\">::\u003C\u002Fspan>\u003Cspan class=\"token function\">getAge\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">,\u003C\u002Fspan> ageEnd\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n\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> users \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>wrapper\u003Cspan class=\"token punctuation\">)\u003C\u002Fspan>\u003Cspan class=\"token punctuation\">;\u003C\u002Fspan>\n    users\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\u003C\u002Fcode>\u003C\u002Fpre>\n      \u003C\u002Fdiv>\n\u003Cp>执行单元测试，实际执行 SQL 如下：\u003C\u002Fp>\n\u003Cp>\n\u003Cdiv class=\"img-loading\">\u003Cimg src=\"\u002Fupload\u002F167344247547271-zSIv.jpg\" loading=\"lazy\">\u003C\u002Fdiv>\n\u003C\u002Fp>\n\u003Cp>功能正常，相比较上面需要写一堆 \u003Ccode>if\u003C\u002Fcode> 判断，我们可以直接将判断条件传给 \u003Ccode>condition\u003C\u002Fcode> 参数，代码看上去舒服多了，有木有~\u003C\u002Fp>\n\u003Ch2 id=\"toc-2\">结语\u003C\u002Fh2>\n\u003Cp>本小节中，我们结合代码示例，详细讲解了 Mybatis Plus 中的条件构造器 Wrapper 方法中的 \u003Ccode>condition\u003C\u002Fcode> 是什么，以及如何使用，希望小伙伴在实际项目开发中，也要善用它，让代码看起来更加优雅。\u003C\u002Fp>"]