详解MybatisPlus中@TableLogic注解的使用

SELECT user_id,name,sex,age,deleted FROM user WHERE user_id=1 AND deleted='0'

update user set deleted=1 where id = 1 and deleted=0

update user set deleted=1 where id = 1 and deleted=0

# application.yml
mybatis-plus:
  global-config:
    db-config:
      # 全局逻辑删除的实体字段名 (since 3.3.0, 配置后可以忽略 @TableLogic 中的配置)
      logic-delete-field: flag
      # 逻辑已删除值(默认为 1)
      logic-delete-value: 1
      # 逻辑未删除值(默认为 0)
      logic-not-delete-value: 0

-- 添加一个 deleted 字段，实现逻辑删除
ALTER TABLE `user`
ADD COLUMN `deleted`  varchar(1) NULL DEFAULT 0 COMMENT '是否删除（1-删除；0-未删除）';

import com.baomidou.mybatisplus.annotation.*;
 
@TableName(value = "user")
public class AnnotationUser7Bean {
   @TableId(value = "user_id", type = IdType.AUTO)
   private int userId;
    
   @TableField("name")
   private String name;
    
   @TableField("sex")
   private String sex;
    
   @TableField("age")
   private Integer age;
    
   @TableLogic(value = "0", delval = "1")
   private String deleted;
    
   // 忽略 getter 和 setter 方法
    
   @Override
   public String toString() {
      return "UserBean{" +
            "userId=" + userId +
            ", name='" + name + '\'' +
            ", sex='" + sex + '\'' +
            ", age=" + age +
            ", deleted=" + deleted +
            '}';
   }
}

@TableLogic(value = "0", delval = "1")
private String deleted;

package com.hxstrive.mybatis_plus.simple_mapper.annotation;
 
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.hxstrive.mybatis_plus.mapper.AnnotationUser7Mapper;
import com.hxstrive.mybatis_plus.model.AnnotationUser7Bean;
import org.junit.jupiter.api.Test;
import org.junit.runner.RunWith;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import org.springframework.test.context.junit4.SpringRunner;
 
@RunWith(SpringRunner.class)
@SpringBootTest
class AnnotationDemo7 {
 
    @Autowired
    private AnnotationUser7Mapper userMapper;
 
    @Test
    void contextLoads() throws Exception {
        // 删除用户ID为1的用户信息
        AnnotationUser7Bean oldUserBean = userMapper.selectById(1);
        if(null != oldUserBean) {
            userMapper.deleteById(oldUserBean.getUserId());
        }
 
        // 查询用户信息
        QueryWrapper<AnnotationUser7Bean> wrapper = new QueryWrapper<>();
        wrapper.lt("user_id", 10);
        for(AnnotationUser7Bean item : userMapper.selectList(wrapper)) {
            System.out.println(item);
        }
    }
 
}

Preparing: SELECT user_id,name,sex,age,deleted FROM user WHERE user_id=? AND deleted='0'
Parameters: 1(Integer)

Preparing: UPDATE user SET deleted='1' WHERE user_id=? AND deleted='0'
Parameters: 1(Integer)

Preparing: SELECT user_id,name,sex,age,deleted FROM user WHERE deleted='0' AND (user_id < ?)
Parameters: 10(Integer)