USE [Test] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER TRIGGER [dbo].[trg_InsertAndUpdate] ON [dbo].[Shop_OrderAmount] FOR UPDATE AS BEGIN SET NOCOUNT ON; declare @oldQty int, @newQty int, @ShopGid uniqueidentifier, @ProdGid uniqueidentifier, @tempShop Nvarchar(MAX) --更新前的数据 select @oldQty=Qty, @ShopGid =ShopGid, @ProdGid=ProdGid from deleted; BEGIN --更新后的数据 select @newQty = Qty from inserted; --声明游标 declare cursorShopQty cursor for (select DISTINCT A.Gid from inserted A inner join deleted B on A.Gid=B.Gid ) --打开游标-- open cursorShopQty --开始循环游标变量-- fetch next from cursorShopQty into @tempShop --返回被 FETCH语句执行的最后游标的状态-- while @@FETCH_STATUS = 0 if (update(Qty) and @newQty<>@oldQty) BEGIN INSERT INTO Shop_OrderLog (Gid,ShopGid,ProdGid,Qty,UserQty, CreateDate) select NEWID(), B.Gid,B.ShopGid,B.ProdGid,B.Qty, isnull(A.Qty,0)-ABS(B.Qty), GETDATE() from inserted A inner join deleted B on A.Gid=B.Gid where A.Gid=@tempShop --转到下一个游标,没有会死循环 fetch next from cursorShopQty into @tempShop END close cursorShopQty --关闭游标 deallocate cursorShopQty --释放游标 END END 游标处理:触发器中DELETE和INSERTED其实是两张虚表,因此用变量获取仅能得到一条数据,但是如果用游标的话可以获取到位于虚表中的所有数据,批量处理 USE [Test] GO SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO ALTER TRIGGER [dbo].[trg_InsertAndUpdate] ON [dbo].[Shop_OrderAmount] FOR UPDATE AS BEGIN SET NOCOUNT ON; declare @oldQty int, @newQty int, @ShopGid uniqueidentifier, @ProdGid uniqueidentifier --更新前的数据 select @oldQty=Qty, @ShopGid =ShopGid, @ProdGid=ProdGid from deleted; BEGIN --更新后的数据 select @newQty = Qty from inserted; if (update(Qty) and @newQty<>@oldQty) BEGIN INSERT INTO Shop_OrderLog (Gid,ShopGid,ProdGid,Qty,UserQty, CreateDate) select NEWID(), B.Gid,B.ShopGid,B.ProdGid,B.Qty, isnull(A.Qty,0)-ABS(B.Qty), GETDATE() from inserted A inner join deleted B on A.Gid=B.Gid END END 未使用游标处理:触发器中DELETE和INSERTED是两张虚表,那么其实上述的操作也可以这么来 来源:https://www./content-4-603401.html |
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