MyBatis一对一级联更新问题小结
作者：YYAugenstern
日常工作中经常会涉及到一对一级联更新的问题,本文主要介绍了MyBatis一对一级联更新问题小结,具有一定的参考价值,感兴趣的可以了解一下
一、概述
日常工作中经常会涉及到一对一级联更新的问题，例如：更新员工信息时也需要更新员工所在的部门信息，那么这种情况下就涉及到了MyBatis的级联更新问题。
二、代码实战
2.1、pom
<dependencies> <!-- springboot --> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-web</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency> <!-- 数据源 --> <dependency> <groupId>mysql</groupId> <artifactId>mysql-connector-java</artifactId> <version>8.0.26</version> </dependency> <dependency> <groupId>org.mybatis.spring.boot</groupId> <artifactId>mybatis-spring-boot-starter</artifactId> <version>2.3.1</version> </dependency> <dependency> <groupId>com.alibaba</groupId> <artifactId>druid-spring-boot-starter</artifactId> <version>1.1.10</version> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-data-redis</artifactId> </dependency> <!-- 工具 --> <dependency> <groupId>org.projectlombok</groupId> <artifactId>lombok</artifactId> <version>1.18.30</version> </dependency> <dependency> <groupId>cn.hutool</groupId> <artifactId>hutool-all</artifactId> <version>5.8.21</version> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-lang3</artifactId> </dependency> <dependency> <groupId>org.apache.commons</groupId> <artifactId>commons-collections4</artifactId> <version>4.4</version> </dependency> <dependency> <groupId>com.alibaba.fastjson2</groupId> <artifactId>fastjson2</artifactId> <version>2.0.25</version> </dependency> </dependencies>
2.2、yml
server:
port: 9999
spring:
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: com.mysql.cj.jdbc.Driver
url: jdbc:mysql://localhost:3306/20231018_redis?useSSL=false&useUnicode=true&characterEncoding=UTF8&serverTimezone=GMT
username: root
password: 123456
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: org.stat.entity.model
configuration:
map-underscore-to-camel-case: true
logging:
level:
org:
star:
mapper: debug
2.3、主启动
/**
* @Author : 一叶浮萍归大海
* @Date: 2023/12/10 12:44
* @Description:
*
*/
@MapperScan(basePackages = "org.star.mapper")
@SpringBootApplication
public class SpringbootMybatisApplication {
public static void main(String[] args) {
SpringApplication.run(SpringbootMybatisApplication.class, args);
}
}2.4、DepartmentDO
/**
* @Author : 一叶浮萍归大海
* @Date: 2023/12/10 12:48
* @Description:
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
@ToString(callSuper = true)
public class DepartmentDO implements Serializable {
/**
* 编号
*/
private Integer id;
/**
* 部门名称
*/
private String departmentName;
}2.5、EmployeeDO
/**
* @Author : 一叶浮萍归大海
* @Date: 2023/12/10 15:38
* @Description:
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
@Accessors(chain = true)
@ToString(callSuper = true)
public class EmployeeDO implements Serializable {
/**
* 员工编号
*/
private Integer id;
/**
* 姓名
*/
private String name;
/**
* 年龄
*/
private Integer age;
/**
* 部门
*/
private DepartmentDO department;
}2.6、EmployeeMapper
/**
* @Author : 一叶浮萍归大海
* @Date: 2023/12/10 15:40
* @Description:
*/
public interface EmployeeMapper {
/**
* 级联更新员工信息（更新员工信息 & 部门信息）
* @param param
*/
void updateEmployeeCascade(EmployeeDO param);
}2.7、EmployeeMapper.xml
<!DOCTYPE mapper
PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-mapper.dtd">
<mapper namespace="org.star.mapper.EmployeeMapper">
<update id="updateEmployeeCascade">
update employee e left join department d
on e.department_id = d.id
<set>
<if test="name != null and name != ''">
e.name = #{name},
</if>
<if test="age != null">
e.age = #{age},
</if>
<if test="department.departmentName != null and department.departmentName != ''">
d.department_name = #{department.departmentName}
</if>
</set>
where e.id = #{id}
</update>
</mapper>2.8、EmployeeMapperTest
/**
* @Author : 一叶浮萍归大海
* @Date: 2023/12/10 15:42
* @Description:
*/
@SpringBootTest
public class EmployeeMapperTest {
@Autowired
private EmployeeMapper employeeMapper;
@Test
public void updateEmployeeTest() {
EmployeeDO employeeDO = new EmployeeDO()
.setId(2)
.setName("刘亦菲")
.setAge(18)
.setDepartment(
new DepartmentDO()
.setId(2)
.setDepartmentName("市场部222")
);
employeeMapper.updateEmployeeCascade(employeeDO);
}
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