MybatisPlus自动填充时间

MybatisPlus自动填充时间

基于这篇博客修改

[整合MybatisPlus测试]

数据库新建两个时间字段

user类

package com.xiang.pojo;

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 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) //数字类型的id使用，当类型为Long时默认使用，生成19位的Id值，
//    @TableId(type = IdType.ID_WORKER_STR)//字符串类型的id使用，需要写明注解，生成19位的Id值
    //同时需要设置数据库的字段id的类型为Bigint，因为int的长度只有11位

    private Long id;
    private String username;
    private String sex;
    private int age;
    private Date birthday;

    /***
     * 使用mybatisPlus自动填充时间
     *
     *     第一：添加注解
     *     第二：实现MetaObjectHandler接口
     *     第三：重写inserFill和updateFill方法
     *     第四：调用setFieldValByName方法
     */

    @TableField(fill = FieldFill.INSERT)//进行添加操作时有值
    private Date createDate;

    @TableField(fill = FieldFill.INSERT_UPDATE)////进行添加和修改操作时有值
    private Date updateDate;
}

创建MeatObjectHandler类

package com.xiang.handler;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.util.Date;

/**
 * Created by IntelliJ IDEA.
 * User: xiang
 * Date: 2021/10/22 22:50
 */
@Component
public class MeatObjectHandler implements MetaObjectHandler {


    @Override
    //使用MybatisPlus实现添加操作时，该方法会执行
    public void insertFill(MetaObject metaObject) {
        //参数：需要设置的属性；设置的时间；元数据(理解：表中的数据)
        this.setFieldValByName("createTime", new Date(), metaObject);
        this.setFieldValByName("updateTime", new Date(), metaObject);

    }

    @Override
    //使用MybatisPlus实现修改操作时，该方法会执行
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}

测试类

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.Date;
import java.util.List;

/**
 * Created by IntelliJ IDEA.
 * User: xiang
 * Date: 2021/10/22 23:10
 */
@SpringBootTest
public class FillingTime {
    @Autowired
    UserMapper userMapper;

    /**
     * MybatisPlus自动填充时间
     */

    @Test
    /**
     * 插入
     */
    public void insertTime() {
        User user = new User();
        user.setUsername("向向");
        user.setSex("女");
        user.setAge(20);
        user.setBirthday(new Date());
       /* user.setCreateDate(new Date());
        user.setUpdateDate(new Date());*/

        int insert = userMapper.insert(user);
        if (insert > 0) {
            System.out.println("插入成功");
        } else {
            System.out.println("fail");
        }
        List<User> list = userMapper.selectList(null);
        for (User listUser : list) {
            System.out.println(listUser);
        }
    }


    @Test
    /**
     * 修改
     */
    void updateTime() {
        User user = new User();
        user.setId(1451573602674176001l);
        user.setAge(18);
        userMapper.updateById(user);
        List<User> list = userMapper.selectList(null);
        for (User listUser : list) {
            System.out.println(listUser);
        }
    }
}

运行结果

插入

JDBC Connection [HikariProxyConnection@1979825302 wrapping com.mysql.cj.jdbc.ConnectionImpl@48a0c8aa] will not be managed by Spring
==>  Preparing: INSERT INTO user ( id, username, sex, age, birthday, create_time, update_time ) VALUES ( ?, ?, ?, ?, ?, ?, ? )
==> Parameters: 1451573602674176001(Long), 向向(String), 女(String), 20(Integer), 2021-10-22 23:38:10.417(Timestamp), 2021-10-22 23:38:10.468(Timestamp), 2021-10-22 23:38:10.468(Timestamp)
<==    Updates: 1
Closing non transactional SqlSession [org.apache.ibatis.session.defaults.DefaultSqlSession@2da3b078]
插入成功
JDBC Connection [HikariProxyConnection@1578026015 wrapping com.mysql.cj.jdbc.ConnectionImpl@48a0c8aa] will not be managed by Spring
==>  Preparing: SELECT id,username,sex,age,birthday,create_time,update_time FROM user
==> Parameters: 
<==    Columns: id, username, sex, age, birthday, create_time, update_time
<==        Row: 1, xiang, 男, 18, 2021-10-03, null, null
<==        Row: 559, 小向, 男, 18, 2021-10-04, null, null
<==        Row: 602, admin, 女, 18, 2021-10-20, null, null
<==        Row: 603, testbox, 女, 18, 2021-10-02, null, null
<==        Row: 604, 小一, 男, 18, 2021-10-16, null, null
<==        Row: 605, 小二, 女, 18, null, null, null
<==        Row: 607, 小四, 女, 21, null, null, null
<==        Row: 609, 小五, 女, 0, null, null, null
<==        Row: 1451097869404868609, 向某, 男, 0, null, null, null
<==        Row: 1451098975287668738, 周某, 男, 0, null, null, null
<==        Row: 1451572730934198273, 向向, 女, 20, 2021-10-22, 2021-10-22 23:34:43, 2021-10-22 23:34:43
<==        Row: 1451573602674176001, 向向, 女, 20, 2021-10-22, 2021-10-22 23:38:10, 2021-10-22 23:38:10
<==      Total: 12

修改

JDBC Connection [HikariProxyConnection@1986001684 wrapping com.mysql.cj.jdbc.ConnectionImpl@57562473] will not be managed by Spring
==>  Preparing: UPDATE user SET age=?, update_time=? WHERE id=?
==> Parameters: 18(Integer), 2021-10-22 23:46:10.247(Timestamp), 1451573602674176001(Long)
<==    Updates: 1
JDBC Connection [HikariProxyConnection@173070089 wrapping com.mysql.cj.jdbc.ConnectionImpl@57562473] will not be managed by Spring
==>  Preparing: SELECT id,username,sex,age,birthday,create_time,update_time FROM user
==> Parameters: 
<==    Columns: id, username, sex, age, birthday, create_time, update_time
<==        Row: 1, xiang, 男, 18, 2021-10-03, null, null
<==        Row: 559, 小向, 男, 18, 2021-10-04, null, null
<==        Row: 602, admin, 女, 18, 2021-10-20, null, null
<==        Row: 603, testbox, 女, 18, 2021-10-02, null, null
<==        Row: 604, 小一, 男, 18, 2021-10-16, null, null
<==        Row: 605, 小二, 女, 18, null, null, null
<==        Row: 607, 小四, 女, 21, null, null, null
<==        Row: 609, 小五, 女, 0, null, null, null
<==        Row: 1451097869404868609, 向某, 男, 0, null, null, null
<==        Row: 1451098975287668738, 周某, 男, 0, null, null, null
<==        Row: 1451572730934198273, 向向, 女, 20, 2021-10-22, 2021-10-22 23:34:43, 2021-10-22 23:34:43
<==        Row: 1451573602674176001, 向向, 女, 18, 2021-10-22, 2021-10-22 23:38:10, 2021-10-22 23:46:10
<==      Total: 12