时间:2021-07-01 10:21:17 帮助过:5人阅读
以前都是也得mysql,现在写sqlserver的触发器,感觉改动还是蛮大的 1.定义变量 #在mysql中变量直接这么定义就可以了SET @VALUE = 111;#在sql server中declare @count int;#并赋值set @count =0;#如果是查询,必须这么些select @count = count(*) from WQ_MNI
以前都是也得mysql,现在写sqlserver的触发器,感觉改动还是蛮大的
1.定义变量
#在mysql中变量直接这么定义就可以了 SET @VALUE = "111"; #在sql server中 declare @count int; #并赋值 set @count =0; #如果是查询,必须这么些 select @count = count(*) from WQ_MNINF_D_REAL where STCD=@stcd;
在mysql中,if判断的格式
if 条件 then 语句 end if;
而在sql server中,if判断的格式
if(条件) begin 语句 end;
例子
#mysql IF @VALUE4=1 THEN INSERT INTO t_sca_history_data (METER_CODE,PARAM_CODE,DATA_VALUE,V_VALUE,DATE_TIME) VALUES (NEW.METER_CODE,NEW.PARAM_CODE,NEW.DATA_VALUE,NEW.V_VALUE,NEW.DATE_TIME); END IF; sql server if(@count=0) begin insert into WQ_MNINF_D_REAL select STCD,TYPE,UPPERVALUE,LOWERVALUE,TM,NT,@smid,@stnm,@prjcd,@pipcd from inserted; end
3.触发器的new
在mysql中,用new.NAME 可以得到触发器触发插入的值,而sql server不是这样的,sql server是把处罚的数据放在一个临时表中,所以它的操作是这样的
#inserted代表插入数据的那张临时表,同时还有deleted 这张用作删除数据的临时表 select STCD from inserted #若只是把插入的数据插入另一张表,语句如下 insert into WQ_WWFINF_D_REAL select PRJCD,TM,INFL,SWWL,CWWL,OTPS,OTF,QOEC,PSPPS,NT FROM inserted; #如果还有加点别的数据,可以这么做 insert into WQ_MNINF_D_REAL select STCD,TYPE,UPPERVALUE,LOWERVALUE,TM,NT,@smid,@stnm,@prjcd,@pipcd from inserted;
4.我做的触发器的代码,改触发器的作用是把原始数据表的数据插入到实时数据表中,如果实时表没有该数据,就插入,如果有,就删除再插入
BEGIN declare @stcd varchar(30); declare @count int; declare @smid int; declare @stnm varchar(30); declare @prjcd varchar(30); declare @pipcd varchar(30); select @stcd = STCD from inserted; select @count = count(*) from WQ_MNINF_D_REAL where STCD=@stcd; select @smid = SMID from WQ_WQSINF_B where STCD=@stcd; select @stnm = STNM from WQ_WQSINF_B where STCD=@stcd; select @prjcd = PRJCD from WQ_WQSINF_B where STCD=@stcd; select @pipcd = PIPCD from WQ_WQSINF_B where STCD=@stcd; if(@count=0) begin insert into WQ_MNINF_D_REAL select STCD,TYPE,UPPERVALUE,LOWERVALUE,TM,NT,@smid,@stnm,@prjcd,@pipcd from inserted; end else begin delete WQ_MNINF_D_REAL where STCD=@stcd; insert into WQ_MNINF_D_REAL select STCD,TYPE,UPPERVALUE,LOWERVALUE,TM,NT,@smid,@stnm,@prjcd,@pipcd from inserted; end END
http://blog.csdn.net/chenbin520/article/details/6026686