mybatis-plus 自动填充处理

前提：

在数据苦中添加 create_time 和 update_time字段

1、实体类

package com.wt.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;

@Data
@AllArgsConstructor
@NoArgsConstructor
public class User {
    private Long id;
    private String name;
    private Integer age;
    private String email;
    @TableField(fill = FieldFill.INSERT)
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE)
    private Date updateTime;
}

2、创建handler

package com.wt.handler;

import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import lombok.extern.slf4j.Slf4j;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.util.Date;

@Slf4j
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    @Override
    public void insertFill(MetaObject metaObject) {
      log.info("====  insert   =============================");
      this.setFieldValByName("createTime", new Date(), metaObject);
      this.setFieldValByName("updateTime", new Date(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
        log.info("====  update   =============================");
        this.setFieldValByName("updateTime", new Date(), metaObject);
    }
}

3、测试

    @Test
    public void insertSql(){
        User user = new User();
        user.setName("wt");
        user.setAge(30);
        user.setEmail("13057122577@qq.com");
        userMapper.insert(user);
    }

    @Test
    public void updateUser(){
        User user = new User();
        user.setId(1285437905490583554L);
        user.setName("tom");
        userMapper.updateById(user);
    }