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对比MySQL与SQL SERVER2005的触发器写法_MySQL

Jun 01, 2016 pm 01:36 PM
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对比MySQL与SQL SERVER2005的触发器写法

 

最近给从前的项目做了数据库的移植,发现不同公司的产品,还真是差别甚大啊。

     

下面是原来用在MS SQL2005上的一个触发器:

 

Sql代码  

CREATE TRIGGER [TG_Update_Current] ON [dbo].[CurrentLocation]   

FOR UPDATE  

AS  

BEGIN  

      INSERT INTO dbo.HistoryLocation  

      SELECT c.cl_time,c.lo_phone,c.cl_lng,c.cl_lat  

      FROM inserted i,CurrentLocation c  

      WHERE i.lo_phone=c.lo_phone  

END  

go  

 

移植到MySQL 5.01上就成这样子了:

     

Sql代码  

drop trigger if exists TG_Update_Current ;  

delimiter|  

createtrigger TG_Update_Current   

after update ON CurrentLocation   

for each row begin  

      insert into HistoryLocation(lo_phone,hl_lng,hl_lat,hl_time)   

      select NEW.lo_phone, NEW.cl_lng, NEW.cl_lat, NEW.cl_time  

end|  

delimiter;  

 

对比下,除了语法的差异,最大的不适应还是人性化问题,MYSQL的触发器格式就得依上面得写法,你搞错一个词的位置都报错,对官方的文档参详了许久,才发现错误提示中syntax error就是“格式问题”。
 

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