mybatisPlus-自动填充

实体类

import com.baomidou.mybatisplus.annotation.IdType;
import com.baomidou.mybatisplus.annotation.TableField;
import com.baomidou.mybatisplus.annotation.TableId;
import lombok.Data;

import java.util.Date;
import static com.baomidou.mybatisplus.annotation.FieldFill.*;

@Data
public class User {

    @TableId(type = IdType.AUTO)//自增
    private Long id;
    private String name;
    private int age;
    private String email;

    @TableField(fill = INSERT)//插入时自动填充
    private Date create_time;
    @TableField(fill = INSERT_UPDATE)//插入和更新时填充
    private Date update_time;
}

MyMetaObjectHandler

package com.atguigu.handler;

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

import java.util.Date;

@Component
public class MyMetaObjectHandler implements MetaObjectHandler {

    //mybatisPlus执行添加操作，执行次方法
    @Override
    public void insertFill(MetaObject metaObject) {
        this.setFieldValByName("create_time",new Date(),metaObject);
        this.setFieldValByName("update_time",new Date(),metaObject);
    }

    //mybatisPlus执行更新操作，执行次方法
    @Override
    public void updateFill(MetaObject metaObject) {
        this.setFieldValByName("update_time",new Date(),metaObject);
    }
}

测试代码

  @Test
    public void addUser(){
       User user = new User();
       user.setName("zhangsan");
       user.setAge(35);
       user.setEmail("[email protected]");
       int insert = userMapper.insert(user);
       System.out.println(insert);
    }

 @Test
    public void updateUserById(){
        User user = new User();
        user.setId(6L);
        user.setName("lucy");
        user.setAge(30);

        int i = userMapper.updateById(user);
        System.out.println(i);

    }