MybatisPlus物理刪除、邏輯刪除
阿新 • • 發佈:2021-10-23
MybatisPlus物理刪除、邏輯刪除
- 物理刪除:資料在物理層面刪除了,檔案中沒有這條資料了
- 邏輯刪除:修改了標記,檔案中還是存在的
基於這幾篇部落格修改
物理刪除
package com.xiang; import com.baomidou.mybatisplus.annotation.TableField; import com.xiang.mapper.UserMapper; import org.junit.jupiter.api.Test; import org.springframework.beans.factory.annotation.Autowired; import org.springframework.boot.test.context.SpringBootTest; import java.util.ArrayList; import java.util.Arrays; import java.util.HashMap; /** * Created by IntelliJ IDEA. * User: xiang * Date: 2021/10/23 1:44 */ @SpringBootTest public class PhysicalDeletion { @Autowired UserMapper userMapper; /** * 實現物理刪除 */ @Test //通過id刪除 void deleteById() { int deleteById = userMapper.deleteById(1451572730934198273l); if (deleteById > 0) { System.out.println("刪除成功"); } else { System.out.println("刪除失敗"); } } @Test //批量刪除 void deleteBatchIds() { int batchIds = userMapper.deleteBatchIds(Arrays.asList(603, 604)); if (batchIds > 0) { System.out.println("刪除成功"); } else { System.out.println("刪除失敗"); } } @Test //條件刪除 條件與刪除 void deleteByMap() { HashMap<String, Object> map = new HashMap<>(); map.put("username", "向向"); map.put("age", 18); int byMap = userMapper.deleteByMap(map); if (byMap > 0) { System.out.println("刪除成功"); } else { System.out.println("刪除失敗"); } } }
通過id刪除
JDBC Connection [HikariProxyConnection@643552582 wrapping com.mysql.cj.jdbc.ConnectionImpl@1937eaff] will not be managed by Spring ==> Preparing: DELETE FROM user WHERE id=? ==> Parameters: 1451572730934198273(Long) <== Updates: 1 Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@c2584d3] 刪除成功
批量刪除
JDBC Connection [HikariProxyConnection@2038185019 wrapping com.mysql.cj.jdbc.ConnectionImpl@4012d5bc] will not be managed by Spring ==> Preparing: DELETE FROM user WHERE id IN ( ? , ? ) ==> Parameters: 603(Integer), 604(Integer) <== Updates: 2 Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@1caa9eb6] 刪除成功
條件刪除
JDBC Connection [HikariProxyConnection@1464031233 wrapping com.mysql.cj.jdbc.ConnectionImpl@2da66a44] will not be managed by Spring
==> Preparing: DELETE FROM user WHERE age = ? AND username = ?
==> Parameters: 18(Integer), 向向(String)
<== Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2e869098]
刪除成功
刪除前
刪除後
邏輯刪除
資料庫中新增deleted欄位
千萬不要用delete關鍵字、不然你懂的...
user類中新增deleted屬性
新增@TableLogic註解
package com.xiang.pojo;
import com.baomidou.mybatisplus.annotation.*;
import lombok.AllArgsConstructor;
import lombok.Data;
import lombok.NoArgsConstructor;
import java.util.Date;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/21 2:50
*/
/**
* `id` int NOT NULL AUTO_INCREMENT,
* `username` varchar(12) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
* `sex` varchar(2) CHARACTER SET utf8mb4 COLLATE utf8mb4_0900_ai_ci NULL DEFAULT NULL,
* `age` int NULL DEFAULT NULL,
* `birthday` date NULL DEFAULT NULL,
*/
@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
// @TableId(type = IdType.ID_WORKER) //數字型別的id使用,當型別為Long時預設使用,生成19位的Id值,
// @TableId(type = IdType.ID_WORKER_STR)//字串型別的id使用,需要寫明註解,生成19位的Id值
//同時需要設定資料庫的欄位id的型別為Bigint,因為int的長度只有11位
private Long id;
private String username;
private String sex;
private int age;
private Date birthday;
/***
* 使用mybatisPlus自動填充時間
*
* 第一:添加註解
* 第二:實現MetaObjectHandler介面
* 第三:重寫inserFill和updateFill方法
* 第四:呼叫setFieldValByName方法
*/
@TableField(fill = FieldFill.INSERT)//進行新增操作時有值
private Date createTime;
@TableField(fill = FieldFill.INSERT_UPDATE)////進行新增和修改操作時有值
private Date updateTime;
/**
* 新增version屬性,注意新增@Version註解
* 同時使用TableField設定初始值為1
*/
@TableField(fill = FieldFill.INSERT)
@Version
private int version;
//新增刪除標記
@TableLogic
@TableField(fill = FieldFill.INSERT)//設定初始值
private int deleted;
}
設定邏輯刪除的初始值的方式有兩種
1、使用TableField註解
2、在資料庫給欄位設定預設初始值
注:使用TableField註解和在資料庫設定初始值只能選擇一種,不能同時存在
測試類
package com.xiang;
import com.xiang.mapper.UserMapper;
import com.xiang.pojo.User;
import org.junit.jupiter.api.Test;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.test.context.SpringBootTest;
import java.util.List;
/**
* Created by IntelliJ IDEA.
* User: xiang
* Date: 2021/10/23 19:22
*/
@SpringBootTest
public class LogicalDeletion {
@Autowired
UserMapper userMapper;
/**
* 實現邏輯刪除
*/
@Test
void insert() {
User user = new User();
user.setUsername("小不點兒");
user.setAge(19);
int insert = userMapper.insert(user);
if (insert > 0) {
System.out.println("新增成功");
} else {
System.out.println("新增失敗");
}
List<User> list = userMapper.selectList(null);
for (User listUser : list) {
System.out.println(listUser);
}
}
@Test
//根據id刪除
void deleteById() {
int deleteById = userMapper.deleteById(1451895657063972866l);
if (deleteById > 0) {
System.out.println("刪除成功");
} else {
System.out.println("刪除失敗");
}
List<User> list = userMapper.selectList(null);
for (User user : list) {
System.out.println(user);
}
}
}
刪除前
刪除後
JDBC Connection [HikariProxyConnection@423095039 wrapping com.mysql.cj.jdbc.ConnectionImpl@7e0bc8a3] will not be managed by Spring
==> Preparing: UPDATE user SET deleted=1 WHERE id=? AND deleted=0
==> Parameters: 1451895657063972866(Long)
<== Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@6fa0450e]
刪除成功
JDBC Connection [HikariProxyConnection@172711139 wrapping com.mysql.cj.jdbc.ConnectionImpl@5793b87] will not be managed by Spring
==> Preparing: SELECT id,username,sex,age,birthday,create_time,update_time,version,deleted FROM user WHERE deleted=0
==> Parameters:
<== Columns: id, username, sex, age, birthday, create_time, update_time, version, deleted
<== Row: 1, xiang, 男, 18, 2021-10-03, null, null, null, 0
<== Row: 559, 小向, 男, 18, 2021-10-04, null, null, null, 0
<== Row: 602, admin, 女, 18, 2021-10-20, null, null, null, 0
<== Row: 605, 小二, 女, 18, null, null, null, null, 0
<== Row: 607, 小四, 女, 21, null, null, null, null, 0
<== Row: 609, 小五, 女, 0, null, null, null, null, 0
<== Row: 1451097869404868609, 向某, 男, 0, null, null, null, null, 0
<== Row: 1451098975287668738, 周某, 男, 0, null, null, null, null, 0
<== Total: 8
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@178f268a]
User(id=1, username=xiang, sex=男, age=18, birthday=Sun Oct 03 00:00:00 CST 2021, createTime=null, updateTime=null, version=0, deleted=0)
User(id=559, username=小向, sex=男, age=18, birthday=Mon Oct 04 00:00:00 CST 2021, createTime=null, updateTime=null, version=0, deleted=0)
User(id=602, username=admin, sex=女, age=18, birthday=Wed Oct 20 00:00:00 CST 2021, createTime=null, updateTime=null, version=0, deleted=0)
User(id=605, username=小二, sex=女, age=18, birthday=null, createTime=null, updateTime=null, version=0, deleted=0)
User(id=607, username=小四, sex=女, age=21, birthday=null, createTime=null, updateTime=null, version=0, deleted=0)
User(id=609, username=小五, sex=女, age=0, birthday=null, createTime=null, updateTime=null, version=0, deleted=0)
User(id=1451097869404868609, username=向某, sex=男, age=0, birthday=null, createTime=null, updateTime=null, version=0, deleted=0)
User(id=1451098975287668738, username=周某, sex=男, age=0, birthday=null, createTime=null, updateTime=null, version=0, deleted=0)