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MyBatis-Plus 多表查询的扩展 | 演示工程 | 使用文档 | 点个Star支持一下吧 (☆▽☆)

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  • Maven
  • Gradle
     implementation 'com.github.yulichang:mybatis-plus-join-boot-starter:1.4.12'
    或者clone代码到本地执行 mvn install, 再引入以上依赖

    注意: MyBatis Plus版本需要3.3.0+


  • mapper继承MPJBaseMapper (必选)
  • service继承MPJBaseService (可选)
  • serviceImpl继承MPJBaseServiceImpl (可选)



class test {
    private UserMapper userMapper;

    void testJoin() {
        //和Mybatis plus一致,MPJLambdaWrapper的泛型必须是主表的泛型,并且要用主表的Mapper来调用
        MPJLambdaWrapper<UserDO> wrapper = JoinWrappers.lambda(UserDO.class)
                .select(UserAddressDO::getTel)//查询user_address tel 字段
                .selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)//别名
                .select(AreaDO::getProvince, AreaDO::getCity)
                .leftJoin(UserAddressDO.class, UserAddressDO::getUserId, UserDO::getId)
                .leftJoin(AreaDO.class, AreaDO::getId, UserAddressDO::getAreaId)
                .eq(UserDO::getId, 1)
                .like(UserAddressDO::getTel, "1")
                .gt(UserDO::getId, 5);

        //连表查询 返回自定义ResultType
        List<UserDTO> list = userMapper.selectJoinList(UserDTO.class, wrapper);

        //分页查询 (需要启用 mybatis plus 分页插件)
        Page<UserDTO> listPage = userMapper.selectJoinPage(new Page<>(2, 10), UserDTO.class, wrapper);


    t.id, t.name, t.sex, t.head_img, 
    t1.tel, t1.address AS userAddress,
    t2.province, t2.city 
    user t 
    LEFT JOIN user_address t1 ON t1.user_id = t.id 
    LEFT JOIN area t2 ON t2.id = t1.area_id 
    t.id = ? 
    AND t1.tel LIKE ? 
    AND t.id > ?)


  • UserDTO.class 查询结果返回类(resultType)
  • selectAll() 查询指定实体类的全部字段
  • 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
  • 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
  • leftJoin() 参数说明
    第一个参数: 参与连表的实体类class
    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
    第三个参数: 参与连表的ON的另一个实体类属性
  • 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....
  • 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


class test {
    private UserMapper userMapper;

    void testResultMap() {
        MPJLambdaWrapper<UserDO> wrapper = new MPJLambdaWrapper<>(User.class)
                .selectCollection(AddressDO.class, UesrDTO::getAddressList)
                .selectAssociation(AddressDO.class, UesrDTO::getAddress)
                .leftJoin(AddressDO.class, AddressDO::getUserId, UserDO::getId);

        List<UserDTO> dtoList = userMapper.selectJoinList(UserDTO.class, wrapper);



使用文档 wiki


捐赠 mybatis-plus-join

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支持连表查询的mybatis-plus体验!mybatis-plus风格的连表操作,提供 leftJoin、rightJoin、innerJoin连表操作 expand collapse

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