third_codes/mybatis-plus-join
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yulichang 2022-11-08 13:29:54 +08:00
parent 6486358711
commit fddf2680d5
1 changed files with 3 additions and 2 deletions
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@ -43,7 +43,8 @@ class test {
private UserMapper userMapper; private UserMapper userMapper;
void testJoin() { void testJoin() {
MPJLambdaWrapper wrapper = new MPJLambdaWrapper<UserDO>() //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 = new MPJLambdaWrapper<UserDO>()
.selectAll(UserDO.class)//查询user表全部字段 .selectAll(UserDO.class)//查询user表全部字段
.select(UserAddressDO::getTel)//查询user_address tel 字段 .select(UserAddressDO::getTel)//查询user_address tel 字段
.selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)//别名 t.address AS userAddress .selectAs(UserAddressDO::getAddress, UserDTO::getUserAddress)//别名 t.address AS userAddress
@ -54,7 +55,7 @@ class test {
.like(UserAddressDO::getTel, "1") .like(UserAddressDO::getTel, "1")
.gt(UserDO::getId, 5); .gt(UserDO::getId, 5);
//连表查询 //连表查询 返回自定义ResultType
List<UserDTO> list = userMapper.selectJoinList(UserDTO.class, wrapper); List<UserDTO> list = userMapper.selectJoinList(UserDTO.class, wrapper);
//分页查询 （需要启用 mybatis plus 分页插件） //分页查询 （需要启用 mybatis plus 分页插件）