mysql日志触发器实现代码

sql语句

DROP TRIGGERIFEXISTS sys_menu_edit;CREATE TRIGGER sys_menu_edit BEFORE UPDATE ON sys_menu FOR EACH ROWBEGININSERT INTO `g4m`.`sys_log` ( `table_name`, `val_id`, `data_json` )VALUES('sys_menu',old.id,CONCAT("{",CONCAT_WS(',',CONCAT_WS( old.id, '"id":"', '"' ),CONCAT_WS( old.CODE, '"code":"', '"' ),CONCAT_WS( old.type_dic, '"type_dic":"', '"' ),CONCAT_WS( old.NAME, '"name":"', '"' ),CONCAT_WS( old.pid, '"pid":"', '"' ),CONCAT_WS( old.status_dic, '"status_dic":"', '"' ),CONCAT_WS( old.url, '"url":"', '"' ),CONCAT_WS( old.path, '"path":"', '"' ),CONCAT_WS( old.icon, '"icon":"', '"' ),CONCAT_WS( old.sort, '"sort":"', '"' ),CONCAT_WS( old.remark, '"remark":"', '"' ),CONCAT_WS( old.create_time, '"create_time":"', '"' ),CONCAT_WS( old.modify_uer_id, '"modify_uer_id":"', '"' ),CONCAT_WS( old.modify_time, '"modify_time":"', '"' )),"}"));

CREATE TRIGGER news_log AFTER INSERT ON news;
FOR EACH ROW INSERT INTO `news_logs` select *, now() from news where newsid = (select max(newsid ) from news);
DROP TRIGGER news_log ;

一共两个表，一个是原始表 news，一个是日志表news_logs(多了一列日期)，可以实现新插入时自动记录日志，不用写代码了。类似还可以实现更新时插入更新日志，详情可查看 MySQL 的文档。

mysql 用触发器记录操作补充

mysql 不能在一个触发器中进行insert,update,delete操作，需分别建三个触发器

insert触发器：

delimiter $$create trigger tri_city_insertafter insert on t_xfw_city for each rowbegin  insert into t_tri_city(id,name,provinceid,ctype)   values(new.id,new.name,new.provinceid,1);end

delimiter $$create trigger tri_city_updateafter update on t_xfw_city for each rowbegin  insert into t_tri_city(id,name,provinceid,ctype)   values(new.id,new.name,new.provinceid,2);end

delimiter $$create trigger tri_city_deleteafter delete on t_xfw_city for each rowbegin  insert into t_tri_city(id,name,provinceid,ctype)   values(old.id,old.name,old.provinceid,3);end

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