INSERT(插入)、DELETE(删除)这些操作时，SQL Server 就会自动执行触发器所定义的SQL语句，从而确保对数据之间的相互关系,实时更新.
create trigger tgr_name on table_name with encrypion –加密触发器 for update... as Transact-SQL 1. 2. 3. 4. 5. 6. # 创建insert类型触发器 --创建insert插入类型触发器 if (object_id('tgr_classes_insert', 'tr') is not null) drop trigger tgr_classes_insert go create trigger tgr_clas...
“Instead of” 触发器可以取代激发它的操作来执行。它在Inserted表和Deleted表刚刚建立,其它任何操作还没有发生时被执行。因为“Instead of” 触发器在约束之前执行,所以它可以对约束进行一些预处理。 5. 创建触发器 1 2 3 4 createtriggertrigger_name on{table_name|view_name} {After|Insteadof} {insert|upd...
在SQL Server 中,触发器(Triggers)是一种特殊的存储过程,它会在特定事件发生时自动执行。当涉及到对数据的插入(INSERT)、更新(UPDATE)或删除(DELETE)操作时,我们有两种主要的触发器类型:INSTEAD OF 触发器和 AFTER 触发器。本文将帮助您理解这两者的区别,并指导您如何实现它们。 触发器概述 触发器类型 流程概述 ...
Server中命令： select newId() ，可以得到SQL server数据库原生的UUID值，因此我们可以将这条指令写到...
insert ... --相应的select语句,insert语句(update语句、delete语句) SET NOCOUNT OFF--可有可无 END GO 4 INSTEAD OF类的语法 CREATE TRIGGERtf_name ONtable INSTEAD OFINSERT--在表table中执行语句时,先执行此触发器的内容 AS BEGIN DECLARE @.. ;--声明变量 ...
本次练习将通过具体的例子介绍如何使用INSTEAD OF触发器,使读者掌握INSTEAD OF触发器的使用方法。 向student表中插入数据时,检查学号是否存在于student表中,如存在则进行插入操作,否则就不插入,具体语句如下所示: CREATE TRIGGER [checkid] ON dbo.student INSTEAD OF insert AS IF NOT EXISTS(SELECT * FROM dbo....
Triggers have been with us since the Sybase days. They're pieces of code that look at lot like stored procedures. However, triggers are attached to tables (and, beginning with SQL Server 2000, to views as well) and act only when the appropriate action (such as INSERT, UPDATE, or ...
CREATE VIEW InsteadView AS SELECT ID, Color, Material, ComputedCol FROM BaseTable; GO --Create an INSTEAD OF INSERT trigger on the view. CREATE TRIGGER InsteadTrigger on InsteadView INSTEAD OF INSERT AS BEGIN --Build an INSERT statement ignoring inserted.ID and ...
Specifies that any insert triggers defined on the destination table execute during the binary data stream upload operation. For more information, see BULK INSERT (Transact-SQL). CHECK_CONSTRAINTS Applies to: SQL Server 2008 (10.0.x) and later. Specifies that all constraints on the target table ...