SpringBoot之Mybatis-plus逻辑删除

1. 添加deleted字段

2.实体类添加deleted 字段，并加注解@TableLogic

3.由于使用了自动填充注解@TableField，所以需要添加元对象处理器

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.stereotype.Component;
import java.util.Date;

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    private static final Logger LOGGER = LoggerFactory.getLogger(MyMetaObjectHandler.class);

    @Override
    public void insertFill(MetaObject metaObject) {
        LOGGER.info("start insert fill ....");
        this.setFieldValByName("deleted", 0, metaObject);
    }

   
}

4.application.properties 加入配置

此为默认值，如果你的默认值和 mp 默认的一样 , 该配置可无

mybatis-plus.global-config.db-config.logic-delete-value=1
mybatis-plus.global-config.db-config.logic-not-delete-value=0

5.配置逻辑删除插件（dao层的注解也放这里）

import com.baomidou.mybatisplus.core.injector.ISqlInjector;
import com.baomidou.mybatisplus.extension.injector.LogicSqlInjector;
import com.baomidou.mybatisplus.extension.plugins.OptimisticLockerInterceptor;
import com.baomidou.mybatisplus.extension.plugins.PaginationInterceptor;
import org.mybatis.spring.annotation.MapperScan;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.transaction.annotation.EnableTransactionManagement;

@EnableTransactionManagement
@Configuration
@MapperScan("com.mine.mpdemo1010.dao")
public class MybatisPlusConfig {


    @Bean
    public ISqlInjector sqlInjector() {
        return new LogicSqlInjector();
    }
 }

6.测试逻辑删除

测试后发现，数据并没有被删除，deleted字段的值由0变成了1
测试后分析打印的sql语句，是一条update
注意：被删除数据的deleted 字段的值必须是 0，才能被选取出来执行逻辑删除的操作

    @Test
    public void testLogicDelete() {
        int result = userMapper.deleteById(1L);
        System.out.println(result);
    }