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1. 插入数据前判断数据是否存在
SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,,Name> -- Create date: <Create Date,,> -- Description: <Description,,> -- ============================================= alter TRIGGER CategoryExistTrigger ON ProductCategory instead of insert AS declare @categoryName varchar(50); BEGIN -- SET NOCOUNT ON added to prevent extra result sets from -- interfering with SELECT statements. SET NOCOUNT ON; -- Insert statements for trigger here select @categoryName = CategoryName from inserted; if exists(select * from ProductCategory where CategoryName =@categoryName) begin print 'Category exists..' end; else begin insert into ProductCategory select * from inserted; end; END
2. 删除表中数据时需要先删除外键表的数据
SET ANSI_NULLS ON GO SET QUOTED_IDENTIFIER ON GO -- ============================================= -- Author: <Author,,Name> -- Create date: <Create Date,,> -- Description: <Description,,> -- ============================================= alter TRIGGER DeleteOrderTrigger ON OrderHeader instead of delete AS declare @OrderId varchar(50); BEGIN SET NOCOUNT ON; select @OrderId = OrderId from deleted; delete from OrderLine where OrderId = @OrderId; END GO
以上就是SqlServer如何实现类似Oracle的before触发器示例。踏出一步又一步，又只能收回一步一步。成长，有些苦涩始终都要去尝。更多关于SqlServer如何实现类似Oracle的before触发器示例请关注haodaima.com其它相关文章！
