[email protected] Annotation usage

One ,fill attribute

Alibaba's development specification recommends that each table be accompanied by a createTime And a updateTime, But it's too troublesome to add it manually every time , You can configure the MP Let it automatically add .
The first 1 Step ： Add TableField Of fill attribute

The first 2 Step ： Override meta object handler .
Use here LocalDateTime Of now Method to get the current time . Be careful JDBC The configuration of should use the time of Dongba District CTT, Do not use UTC When coordinating , There will be less 8 Hours .

spring.datasource.url=jdbc:mysql://localhost:3306/seckill?
useUnicode=true&useSSL=false&characterEncoding=utf8&serverTimezone=CTT

package com.seckill.seckilldemo.config;

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

import java.time.LocalDateTime;

@Component
public class MybatisPlusMetaObjectHandler implements MetaObjectHandler {
    

    @Override
    public void insertFill(MetaObject metaObject) {
    
        this.strictInsertFill(metaObject, "gmtCreate", LocalDateTime.class, LocalDateTime.now());
        this.strictInsertFill(metaObject, "gmtModified", LocalDateTime.class, LocalDateTime.now());
//        setFieldValByName("gmtCreate", LocalDateTime.now(), metaObject);
//        setFieldValByName("gmtModified", LocalDateTime.now(), metaObject);
    }

    @Override
    public void updateFill(MetaObject metaObject) {
    
        this.strictInsertFill(metaObject, "gmtModified", LocalDateTime.class, LocalDateTime.now());
//        setFieldValByName("gmtModified", LocalDateTime.now(), metaObject);
    }
}

Write a test method , Test it ：

result ：