third_codes/mybatis-plus-join
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admin 2021-01-28 10:47:30 +08:00
parent fd51216322
commit 255ea13845
2 changed files with 4 additions and 11 deletions
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3
README.md
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@ -42,7 +42,8 @@
#### 左连接 leftJoin(UserEntity::getId,UserAddressEntity::getUserId,right -> right) #### 左连接 leftJoin(UserEntity::getId,UserAddressEntity::getUserId,right -> right)
前连个参数是两个表的连接条件 -> user left join user_address on user.id = User_address.user_id 前连个参数是两个表的连接条件:
user left join user_address on user.id = User_address.user_id
第三个参数是右表wrapper对象,可以继续使用,以上方法. 第三个参数是右表wrapper对象,可以继续使用,以上方法.
#### 条件查询eq() #### 条件查询eq()

10
src/test/java/com/example/mp/MpJoinTest.java
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@ -17,6 +17,7 @@ import java.util.List;
/** /**
* 连表 * 连表
*/ */
@SuppressWarnings("all")
@SpringBootTest @SpringBootTest
class MpJoinTest { class MpJoinTest {
@ -111,15 +112,6 @@ class MpJoinTest {
} }
/**
* 自定义别名支持
* 如果表重复(自连接,或join同一张表多次 需要用到别名)
* <p>
* 不只是两张表,这个框架没有限制join数量,理论上可以无限join但不建议 [狗头]
* <p>
* 自己去探索发现吧!
*/
@SuppressWarnings("all")
@Test @Test
void test4() { void test4() {
userMapper.selectJoinList(new MyLambdaQueryWrapper<UserEntity>() userMapper.selectJoinList(new MyLambdaQueryWrapper<UserEntity>()