MySQL触发器笔记

当操作了某张数据表时，希望同时触发一些动作或行为，就可以使用触发器完成。

当操作微博表时，同时生成一条日志记录

-- 插入时触发 
create trigger tri_weiboAdd after insert on weibo from each row
    insert into log(create_time) values(unix_timestamp())

-- 修改时触发
create trigger tri_weiboUpd after update on weibo from each row
    insert into log(create_time) values(unix_timestamp())

-- 删除时触发
create grigger tri_weiboDel after delete on weibo from each row
    insert into log(create_time) values(unix_timestamp())