third_codes/mybatis-plus-join
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yulichang 2022-11-08 17:12:01 +08:00
parent 9c9d70333c
commit 4d2aa1e4e7
2 changed files with 7 additions and 2 deletions
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7
README.md
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@ -105,11 +105,16 @@ class test {
void testResultMap() { void testResultMap() {
MPJLambdaWrapper<UserDO> wrapper = new MPJLambdaWrapper<UserDO>() MPJLambdaWrapper<UserDO> wrapper = new MPJLambdaWrapper<UserDO>()
.selectAll(UserDO.class) .selectAll(UserDO.class)
//一对多查询 //对多查询
.selectCollection(AddressDO.class, UesrDTO::getAddressList) .selectCollection(AddressDO.class, UesrDTO::getAddressList)
//对一查询
.selectAssociation(AddressDO.class, UesrDTO::getAddress)
.leftJoin(AddressDO.class, AddressDO::getUserId, UserDO::getId); .leftJoin(AddressDO.class, AddressDO::getUserId, UserDO::getId);
List<UserDTO> dtoList = userMapper.selectJoinList(UserDTO.class, wrapper); List<UserDTO> dtoList = userMapper.selectJoinList(UserDTO.class, wrapper);
//关于对多分页查询
//由于嵌套结果方式会导致结果集被折叠，因此分页查询的结果在折叠后总数会减少，所以无法保证分页结果数量正确。
} }
} }
``` ```

2
src/main/java/com/github/yulichang/wrapper/MPJLambdaWrapper.java
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@ -154,7 +154,7 @@ public class MPJLambdaWrapper<T> extends MPJAbstractLambdaWrapper<T, MPJLambdaWr
* <p> * <p>
* 举例 UserDO UserAddressDO 为一对多关系 UserDTO 为结果类 * 举例 UserDO UserAddressDO 为一对多关系 UserDTO 为结果类
* <pre> * <pre>
* MPJLambdaQueryWrapper<UserDO> wrapper = new MPJLambdaQueryWrapper(); * MPJLambdaQueryWrapper<UserDO> wrapper = new MPJLambdaQueryWrapper<UserDO>();
* wrapper.selectAll(UserDO.class) * wrapper.selectAll(UserDO.class)
* .selectCollection(UserAddressDO.class, UserDTO::getAddressListDTO) * .selectCollection(UserAddressDO.class, UserDTO::getAddressListDTO)
* .leftJoin(UserAddressDO.class, ...... ) * .leftJoin(UserAddressDO.class, ...... )