Mybatis-Plus逻辑删除
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Mybatis-Plus逻辑删除
逻辑删除
物理删除∶从数据库中直接移除
逻辑删除︰再数据库中没有被移除,而是通过一个变量来让他失效! deleted =0 => deleted = 1
管理员可以查看被删除的记录!防止数据的丢失,类似于回收站!
1、在数据库中添加deleted字段
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2、导入依赖
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<dependency>
<groupId>com.baomidou</groupId>
<artifactId>mybatis-plus-boot-starter</artifactId>
<version>3.0.5</version>
</dependency>
2、编写配置文件.YML
spring:
datasource:
username: root
password: root
url: jdbc:mysql://localhost:3306/mybatis
driver-class-name: com.mysql.jdbc.Driver
#配置日志
mybatis-plus:
configuration:
log-impl: org.apache.ibatis.logging.stdout.StdOutImpl
#配置逻辑删除
global-config:
db-config:
logic-delete-value: 1
logic-not-delete-value: 0
3、编写持久类
@Data
@AllArgsConstructor
@NoArgsConstructor
public class user implements Serializable {
@TableId(type = IdType.AUTO)
private Long id;
private String name;
private Integer age;
private String email;
@Version//乐观锁注解
private Integer version;
@TableLogic//逻辑删除
private Integer deleted;
@TableField(fill = FieldFill.INSERT)
private Date createTime;
@TableField(fill = FieldFill.INSERT_UPDATE)
private Date updateTime;
}
4、编写mapper类
@Repository
public interface mapper extends BaseMapper <user> {
}
5、编写config配置类
//扫描mapper包
@MapperScan("com.xys.Mapper")
@EnableTransactionManagement
@Configuration//配置类
public class MybatisConfig {
//注册乐观锁插件
@Bean
public OptimisticLockerInterceptor optimisticLockerInterceptor(){
return new OptimisticLockerInterceptor();
}
//分页插件
@Bean
public PaginationInterceptor paginationInterceptor(){
return new PaginationInterceptor();
}
//逻辑删除组件
@Bean
public ISqlInjector sqlInjector(){
return new LogicSqlInjector();
}
}
6、编写handle类
@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
//插入时的填充策略
@Override
public void insertFill(MetaObject metaObject) {
log.info("start insert info....");
this.setFieldValByName("createTime",new Date(),metaObject);
this.setFieldValByName("updateTime",new Date(),metaObject);
}
//更新时的填充策略
@Override
public void updateFill(MetaObject metaObject) {
log.info("start update info....");
this.setFieldValByName("updateTime",new Date(),metaObject);
}
}
7、测试类
//根据Id删除
@Test
void delById(){
mapper.deleteById(7L);
}
//批量删除
@Test
void delByList(){
mapper.deleteBatchIds(Arrays.asList(6L,5L));
}
//根据map删除
@Test
void delByMap(){
HashMap<String,Object> map=new HashMap<>();
//自定义要查询
map.put("name","c");
mapper.deleteByMap(map);
}
8、测试结果
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9、再次查询的时候
Creating a new SqlSession
SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@68699afc] was not registered for synchronization because synchronization is not active
JDBC Connection [HikariProxyConnection@1126074033 wrapping com.mysql.cj.jdbc.ConnectionImpl@35c4e864] will not be managed by Spring
==> Preparing: SELECT id,name,age,email,version,deleted,create_time,update_time FROM user WHERE id=? AND deleted=0
==> Parameters: 7(Long)
<== Total: 0
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@68699afc]
但数据库依然存在数据
ameters: 7(Long)
<== Total: 0
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@68699afc]
<font color='red'>但数据库依然存在数据</font>
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