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mysql之触发器_MySQL

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Release: 2016-06-01 13:30:32
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mysql之触发器

 

触发器

 

创建触发器语法如下:

CREATE TRIGGER trigger_name trigger_time trigger_eventON tbl_name FOR EACH ROW trigger_stmt
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其中

trigger_name标识触发器名称,用户自行指定;

trigger_time标识触发时机,用before和after替换;

trigger_event标识触发事件,用insert,update和delete替换;

tbl_name标识建立触发器的表名,即在哪张表上建立触发器;

trigger_stmt是触发器程序体;触发器程序可以使用begin和end作为开始和结束,中间包含多条语句;

例子:

create trigger tg4after insert on goodsfor each rowupdate main set num=num+1 where id=1解释:在goods表执行insert后就会执行update这条语句查看触发器:show triggers;删除触发器:drop trigger 触发器名称;
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