MybatisPlus中的删除和逻辑删除及区别介绍

package com.atguigu.mybatis_plus.entity;
import java.util.Date;
import com.baomidou.mybatisplus.annotation.FieldFill;
import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import com.baomidou.mybatisplus.annotation.TableLogic;
import lombok.Data;
@Data
public class User {
  @TableId(type = IdType.AUTO)
  private Long id;
  private String name;
  private Integer age;
  private String email;
  @TableField(fill = FieldFill.INSERT)
  private Date createTime;
  // @TableField(fill = FieldFill.UPDATE)
  @TableField(fill = FieldFill.INSERT_UPDATE)
  private Date updateTime;
  
}

package com.atguigu.mybatis_plus.mapper;
import com.atguigu.mybatis_plus.entity.User;
import com.baomidou.mybatisplus.core.mapper.BaseMapper;
// 继承BaseMapper后UserMapper就具有了CRUD功能
public interface UserMapper extends BaseMapper<User>{
}

@Test
  public void testLogicDelete() {
    int count = userMapper.deleteById(1L); // 删除id为1的数据
    System.out.println("受影响的行数"+count);
  }

@Test
public void testDeleteBatchIds() {
  int result = userMapper.deleteBatchIds(Arrays.asList(2, 3, 4)); // 删除id为2，3，4的数据
  System.out.println(result);
}

/*
  加@TableLogic的情况下,程序内部会将delete语句变为update语句
  实际上我们写的代码并不需要做出什么改变
  */
  @TableLogic
  private Integer deleted;

	/**
   * 逻辑删除
   */
  @Test
  public void testLogicDelete() {
    int count = userMapper.deleteById(5L);
    System.out.println("受影响的行数"+count);
  }

@Test
  public void testSelect() {
    List<User> users = userMapper.selectList(null); // 查询所有记录
    users.forEach(System.out::println); // 遍历输出
  }