third_codes/mybatis-plus-join
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admin 2021-01-29 17:34:30 +08:00
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@ -84,17 +84,17 @@ FROM user t0
LEFT JOIN area t2 ON t1.area_id = t2.id
```
伪代码
sql -> 伪代码
```java
class test {
void testJoin() {
List<UserDTO> list = userMapper.selectJoinList(new MyLambdaQueryWrapper<主表实体类>()
.selectAll(主表实体类.class)
.leftJoin(主表实体类on属性, 子表实体类on属性, 子表对象 -> 子表对象
.select(子表查询字段)
.leftJoin(第二个表的on属性, 第三个表的on属性,
r2 -> r2.select(第三个表的查询字段)))
List<UserDTO> list = userMapper.selectJoinList(new MyLambdaQueryWrapper<user表>()
.selectAll(user表实体类.class)//查询user表全部字段
.leftJoin(user表on字段, user_address表on字段, user_address表对象 -> user_address表对象
.select(user_address表address字段)
.leftJoin(user_address表表的on字段, area表的on字段,
r2 -> r2.select(area表的province字段)))
, UserDTO.class);//返回对象class
}
}