sql: TRIGGER
--Common Table Expressions(CTE)
WITH HighSample (SampleId,SampleTitle,SampleContent) AS
(
SELECT SampleId,SampleTitle,SampleContent From CompetitionSample
WHERE SampleId>1
)
SELECT * From HighSample --游标
DECLARE curSample INSENSITIVE CURSOR
FOR SELECT TOP 10 SampleId,SampleTitle,SampleContent FROM CompetitionSample
DECLARE @SampleId int
DECLARE @SampleTitle nvarchar(540)
Declare @SampleContent nvarchar(1000)
Open curSample
FETCH NEXT FROM curSample INTO @SampleId,@SampleTitle,@SampleContent
WHILE @@Fetch_Status=0
BEGIN
PRINT @SampleTitle+','+@SampleContent
Fetch NEXT FROM curSample Into @SampleId,@SampleTitle,@SampleContent
END
CLOSE curSample
DEALLOCATE curSample --N到M条记录(要有主索引ID)
--Select Top M-N * From 表 Where ID in (Select Top M ID From 表) Order by ID Desc
select * from ShoppingCouponsList
Select Top (15-10) * From ShoppingCouponsList Where ShoppingCouponsID in (Select Top 15 ShoppingCouponsID From ShoppingCouponsList) Order by ShoppingCouponsID Desc --触发器(添加,修改)
--text,ntext 无法创建约束,可以用此方法
drop TRIGGER Sample_insert CREATE TRIGGER DuSample_insert
ON CompetitionSample
FOR INSERT,UPDATE AS --常见的触发器有三种:分别应用于Insert , Update , Delete 事件
declare @s nvarchar(500)
set @s='err,geovindu'
IF EXISTS (SELECT * FROM CompetitionSample where charindex('</title>',SampleContent)=1)
begin
ROLLBACK TRANSACTION
RAISERROR('有非法字符',16,1,@s)
end --修改不了
update CompetitionSample set SampleContent='</title>' where SampleId='1'
--添加不了
insert into CompetitionSample(SampleTitle,SampleBrandId,SamplePlatformId,SampleSmallPic,SampleContent,SampleAuthor,SampleIs)
values('d2',1,1,'gif','</title>2','g2',0) select * from CompetitionSample where charindex('</title>',SampleContent)=1
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