third_codes/mybatis-plus-join
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fix select子查询参数问题

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yulichang 2023-10-23 00:28:13 +08:00
parent 468a28f836
commit c60e89ea79
2 changed files with 3 additions and 116 deletions
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113
MAPPING.md
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# mybatis-plus-join
#### @EntityMapping 和 @FieldMapping 注解
UserDO.java
```java
@Data
@TableName("user")
public class UserDO {
@TableId
private Integer id;
private Integer pid;//父id
/* 其他属性略 */
/**
* 查询上级 一对一
*/
@TableField(exist = false)
@EntityMapping(thisField = "pid", joinField = "id")
private UserDO pUser;
/**
* 查询下级 一对多
*/
@TableField(exist = false)
@EntityMapping(thisField = "id", joinField = "pid")
private List<UserDO> childUser;
/**
* 带条件的查询下级 一对多
*/
@TableField(exist = false)
@EntityMapping(thisField = "id", joinField = "pid",
condition = {
@MPJMappingCondition(column = "sex", value = "0"),//sex = '0' 默认条件是等于
@MPJMappingCondition(column = "name", value = "张三", keyWord = SqlKeyword.LIKE)//name like '%a%'
},
apply = @MPJMappingApply(value = "id between 1 and 20"))//拼接sql 同 wrapper.apply()
private List<UserDO> childUserCondition;
/**
* 查询地址 (一对多)
*/
@TableField(exist = false)
@EntityMapping(thisField = "id", joinField = "userId")
private List<UserAddressDO> addressList;
/**
* 绑定字段 （一对多）
*/
@TableField(exist = false)
@FieldMapping(tag = UserDO.class, thisField = "id", joinField = "pid", select = "id")
private List<Integer> childIds;
}
```
使用
```java
/**
* 一对一，一对多关系映射查询
* 如果不需要关系映射就使用mybatis plus原生方法即可，比如 getById listByIds 等
* <p>
* 注意：关系映射不会去关联查询，而是执行多次单表查询（对结果汇总后使用in语句查询,再对结果进行匹配）
*/
@SpringBootTest
class MappingTest {
@Resource
private UserMapper userMapper;
@Test
void test1() {
UserDO deep = userMapper.selectByIdDeep(2);
System.out.println(deep);
}
@Test
void test2() {
List<UserDO> list = userMapper.selectRelation(mapper -> mapper.selectList(Wrappers.emptyWrapper()));
list.forEach(System.out::println);
}
@Test
void test3() {
Page<UserDO> page = new Page<>(2, 2);
Page<UserDO> result = userMapper.selectRelation(mapper -> mapper.selectPage(page, Wrappers.emptyWrapper()));
result.getRecords().forEach(System.out::println);
}
/*
更多方法请查阅 MPJDeepMapper 或者 MPJDeepService
使用方式与 mybatis plus 一致
*/
}
```
MPJMapping 说明：
* @EntityMapping / @FieldMapping tag 关联实体类
* @EntityMapping / @FieldMapping thisField 当前类关联对应的字段的属性名，可以不填，默认为当前类的主键
* @EntityMapping / @FieldMapping joinField 关联类对应的字段的属性名，可以不填，默认为关联类的主键
* @EntityMapping / @FieldMapping isThrowExp 一对一查询时,如果查询到多条记录是否抛出异常,true:抛出异常,false:获取列表第一条数据
*
更多功能请看代码注释 [EntityMapping](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/annotation/EntityMapping.java)
[FieldMapping](https://gitee.com/best_handsome/mybatis-plus-join/blob/master/src/main/java/com/github/yulichang/annotation/FieldMapping.java)

6
README.md
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@ -24,9 +24,9 @@
<img alt="code style" src="https://img.shields.io/badge/license-Apache%202-4EB1BA.svg?style=flat-square">
</a>
</p>
<h1 align="center">mybatis-plus-join</h1>
<h1 align="center">MyBatis-Plus-Join</h1>
<p align="center">
对 <a href="https://gitee.com/baomidou/mybatis-plus" target="_blank">mybatis-plus</a> 多表查询的扩展 |
对 <a href="https://gitee.com/baomidou/mybatis-plus" target="_blank">MyBatis-Plus</a> 多表查询的扩展 |
<a href="https://gitee.com/best_handsome/mybatis-plus-join-demo" target="_blank">演示工程</a> |
<a href="https://www.baidu.com/link?url=wdmhssysW-Mj19Gkcc2CBOzNVoimHat57mlnH78SEU_6y0awYgDKTBy7es9BXnAH&wd=&eqid=908484020001866e000000056440b5e3" target="_blank">使用文档</a> |
点个Star支持一下吧 (☆▽☆)
@ -59,7 +59,7 @@ QQ群:1022221898 或者
```
或者clone代码到本地执行 mvn install, 再引入以上依赖
<br>
注意: mybatis plus version >= 3.3.0
注意: MyBatis Plus版本需要3.3.0+
<br>
### 使用