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README.md
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README.md
@ -8,6 +8,10 @@
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[goto wiki](https://gitee.com/best_handsome/mybatis-plus-join/wikis)
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## 通用连表wrapper
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[点击跳转至使用方法](https://gitee.com/best_handsome/mybatis-plus-join/tree/master/src/main/java/com/github/yulichang/common)
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### 安装
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1. 在项目中添加依赖,依赖已经包含了mybatis-plus-boot-starter<3.4.2><br>
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@ -80,6 +84,108 @@ MPJLambdaQueryWrapper相当于mp的LambdaQueryWrapper
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MPJQueryWrapper.lambda() ===> MPJLambdaQueryWrapper
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MPJLambdaQueryWrapper.stringQuery() ===> MPJQueryWrapper
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## MPJJoinLambdaQueryWrapper用法
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#### MPJJoinLambdaQueryWrapper示例
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#### 简单的3表查询
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```java
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class test {
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@Resource
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private UserMapper userMapper;
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void testJoin() {
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List<UserDTO> list = userMapper.selectJoinList(UserDTO.class,
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new MPJJoinLambdaQueryWrapper<UserDO>()
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.selectAll(UserDO.class)
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.select(UserAddressDO::getTel)
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.selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)
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.select(AreaDO::getProvince, AreaDO::getCity)
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.leftJoin(UserAddressDO.class, UserAddressDO::getUserId, UserDO::getId)
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.leftJoin(AreaDO.class, AreaDO::getId, UserAddressDO::getAreaId)
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.eq(true, UserDO::getId, 1)
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.like(true, UserAddressDO::getTel, "1")
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.gt(true, UserDO::getId, 5));
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}
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}
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```
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对应sql
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```
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SELECT
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t.id,
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t.name,
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t.sex,
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t.head_img,
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t1.tel,
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t1.address AS userAddress,
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t2.province,
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t2.city
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FROM
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user t
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LEFT JOIN user_address t1 ON t1.user_id = t.id
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LEFT JOIN area t2 ON t2.id = t1.area_id
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WHERE (
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t.id = ?
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AND t1.tel LIKE ?
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AND t.id > ?)
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```
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说明:
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* UserDTO.class 查询结果返回类(resultType)
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* selectAll() 查询指定实体类的全部字段
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* select() 查询指定的字段,支持可变参数,同一个select只能查询相同表的字段
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故将UserAddressDO和AreaDO分开为两个select()
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* selectAs() 字段别名查询,用于数据库字段与业务实体类属性名不一致时使用
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* leftJoin() 参数说明
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第一个参数: 参与连表的实体类class
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第二个参数: 连表的ON字段,这个属性必须是第一个参数实体类的属性
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第三个参数: 参与连表的ON的另一个实体类属性
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* 默认主表别名是t,其他的表别名以先后调用的顺序使用t1,t2,t3....
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* 条件查询,可以查询主表以及参与连接的所有表的字段,全部调用mp原生的方法,正常使用没有sql注入风险
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#### 分页查询
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```java
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class test {
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@Resource
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private UserMapper userMapper;
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void testJoin() {
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IPage<UserDTO> iPage = userMapper.selectJoinPage(new Page<>(2, 10), UserDTO.class,
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new MPJJoinLambdaQueryWrapper<UserDO>()
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.selectAll(UserDO.class)
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.select(UserAddressDO::getTel)
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.selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)
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.select(AreaDO::getProvince, AreaDO::getCity)
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.leftJoin(UserAddressDO.class, UserAddressDO::getUserId, UserDO::getId)
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.leftJoin(AreaDO.class, AreaDO::getId, UserAddressDO::getAreaId));
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}
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}
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```
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对应sql
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```
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SELECT
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t.id,
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t.name,
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t.sex,
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t.head_img,
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t1.tel,
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t1.address AS userAddress,
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t2.province,
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t2.city
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FROM
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user t
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LEFT JOIN user_address t1 ON t1.user_id = t.id
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LEFT JOIN area t2 ON t2.id = t1.area_id
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LIMIT ?,?
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```
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## MPJQueryWrapper和MPJLambdaQueryWrapper
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### 简单的3表查询
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@ -227,112 +333,6 @@ ORDER BY
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addr.id DESC
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```
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## MPJJoinLambdaQueryWrapper用法
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MPJJoinLambdaQueryWrapper与上面连个Wrapper不同,是一套新的支持多表的wrapper
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MPJQueryWrapper是基于QueryWrapper扩展的MPJLambdaQueryWrapper是基于LambdaQueryWrapper扩展的
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而LambdaQueryWrapper由于泛型约束,不支持扩展成多表的lambdaWrapper
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#### MPJJoinLambdaQueryWrapper示例
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#### 简单的3表查询
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```java
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class test {
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@Resource
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private UserMapper userMapper;
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void testJoin() {
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List<UserDTO> list = userMapper.selectJoinList(UserDTO.class,
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new MPJJoinLambdaQueryWrapper<UserDO>()
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.selectAll(UserDO.class)
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.select(UserAddressDO::getTel)
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.selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)
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.select(AreaDO::getProvince, AreaDO::getCity)
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.leftJoin(UserAddressDO.class, UserAddressDO::getUserId, UserDO::getId)
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.leftJoin(AreaDO.class, AreaDO::getId, UserAddressDO::getAreaId)
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.eq(true, UserDO::getId, 1)
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.like(true, UserAddressDO::getTel, "1")
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.gt(true, UserDO::getId, 5));
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}
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}
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```
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对应sql
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```
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SELECT
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t.id,
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t.name,
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t.sex,
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t.head_img,
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t1.tel,
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t1.address AS userAddress,
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t2.province,
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t2.city
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FROM
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user t
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LEFT JOIN user_address t1 ON t1.user_id = t.id
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LEFT JOIN area t2 ON t2.id = t1.area_id
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WHERE (
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t.id = ?
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AND t1.tel LIKE ?
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AND t.id > ?)
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```
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说明:
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* UserDTO.class 查询结果返回类(resultType)
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* selectAll() 查询指定实体类的全部字段
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* select() 查询指定的字段,支持可变参数,同一个select只能查询相同表的字段
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故将UserAddressDO和AreaDO分开为两个select()
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* selectAs() 字段别名查询,用于数据库字段与业务实体类属性名不一致时使用
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* leftJoin() 参数说明
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第一个参数: 参与连表的实体类class
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第二个参数: 连表的ON字段,这个属性必须是第一个参数实体类的属性
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第三个参数: 参与连表的ON的另一个实体类属性
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* 默认主表别名是t,其他的表别名以先后调用的顺序使用t1,t2,t3....
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* 条件查询,可以查询主表以及参与连接的所有表的字段,全部调用mp原生的方法,正常使用没有sql注入风险
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#### 分页查询
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```java
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class test {
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@Resource
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private UserMapper userMapper;
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void testJoin() {
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IPage<UserDTO> iPage = userMapper.selectJoinPage(new Page<>(2, 10), UserDTO.class,
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new MPJJoinLambdaQueryWrapper<UserDO>()
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.selectAll(UserDO.class)
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.select(UserAddressDO::getTel)
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.selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)
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.select(AreaDO::getProvince, AreaDO::getCity)
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.leftJoin(UserAddressDO.class, UserAddressDO::getUserId, UserDO::getId)
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.leftJoin(AreaDO.class, AreaDO::getId, UserAddressDO::getAreaId));
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}
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}
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```
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对应sql
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```
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SELECT
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t.id,
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t.name,
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t.sex,
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t.head_img,
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t1.tel,
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t1.address AS userAddress,
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t2.province,
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t2.city
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FROM
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user t
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LEFT JOIN user_address t1 ON t1.user_id = t.id
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LEFT JOIN area t2 ON t2.id = t1.area_id
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LIMIT ?,?
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```
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# [wiki](https://gitee.com/best_handsome/mybatis-plus-join/wikis)
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||||
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@ -2,6 +2,14 @@
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### 使用方法
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#### 如需单独使用 请拷贝以下5个类
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[com.github.yulichang.common.JoinLambdaWrapper](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/common/JoinLambdaWrapper.java)
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[com.github.yulichang.common.JoinAbstractWrapper](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/common/JoinAbstractLambdaWrapper.java)
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[com.github.yulichang.common.JoinAbstractLambdaWrapper](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/common/JoinAbstractLambdaWrapper.java)
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[com.github.yulichang.wrapper.interfaces.Compare](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/wrapper/interfaces/Compare.java)
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[com.github.yulichang.wrapper.interfaces.Func](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/wrapper/interfaces/Func.java)
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#### 不使用表别名
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注解:
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