mybatisplus realizes automatic filling time

mybatisplus implements automatic filling function - automatic filling time

Fields in database tables

Creation time (createTime)
Update time (updateTime)

Every time you add, delete, modify or query, you need to set the fields of the Entity ( createTime, updateTime ). However, it is troublesome to set the fields for every addition, deletion, and modification.

Using the autofill function, we don’t have to set it ourselves.

1. Add annotations to the entity class Entity

@TableField(fill = FieldFill.INSERT) // Automatically fill in when inserting
@TableField(fill = FieldFill.INSERT_UPDATE) // Automatically fill when inserting and updating

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2. Configure autofill interceptor

3. The creation time, update time, creator and updater field names in the database table.
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4. Automatically fill in the interceptor
MyMetaObjectHandler

package com.sangeng.handler.mybatisplus;
import com.baomidou.mybatisplus.core.handlers.MetaObjectHandler;
import com.sangeng.utils.SecurityUtils;
import org.apache.ibatis.reflection.MetaObject;
import org.springframework.stereotype.Component;

import java.util.Date;
@Component
public class MyMetaObjectHandler implements MetaObjectHandler {
    
    //实现MetaObjectHandler
    //配置自动填充 拦截器
    //insert操作时填充方法
    @Override
    public void insertFill(MetaObject metaObject) {
    
    
        Long userId = null;
//        try {
    
    
            userId = SecurityUtils.getUserId(); //从token中拿到userid,自动填充
//        } catch (Exception e) {     e.printStackTrace();
//        注册的时候，不能获取当前userid，所以userid设置为-1
//           userId = -1L;//表示是自己创建
//        }
        this.setFieldValByName("createTime", new Date(), metaObject);   //创建时间
        this.setFieldValByName("createBy",userId , metaObject);         //创建人
        this.setFieldValByName("updateTime", new Date(), metaObject);   //更新时间
        this.setFieldValByName("updateBy", userId, metaObject);         //更新人
    }
    //update操作时填充方法
    @Override
    public void updateFill(MetaObject metaObject) {
    
     //填充 更新时间
        this.setFieldValByName("updateTime", new Date(), metaObject);
//        this.setFieldValByName(" ", SecurityUtils.getUserId(), metaObject);
    }
}

Entity class

    @TableField(fill = FieldFill.INSERT) //插入时 自动添加创建人
    private Long createBy;
    @TableField(fill = FieldFill.INSERT) //插入时 自动添加 创建时间
    private Date createTime;
    @TableField(fill = FieldFill.INSERT_UPDATE) //插入更新时 自动添加 更新人
    private Long updateBy;
    @TableField(fill = FieldFill.INSERT_UPDATE) //插入更新时 自动添加 更新时间
    private Date updateTime;

mybatisplus realizes automatic filling time

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