Question

如何利用触发器实现两个数据库间的同步

Answer 1

SQL Server 2005的联机帮助：Trigger on an INSERT, UPDATE, or DELETE statement to a table or view (DML Trigger)CREATE TRIGGER [ schema_name . ]trigger_nameON { table | view }[ WITH [ ,...n ] ]{ FOR | AFTER | INSTEAD OF } { [ INSERT ] [ , ] [ UPDATE ] [ , ] [ DELETE ] }[ WITH APPEND ][ NOT FOR REPLICATION ]AS { sql_statement [ ; ] [ ...n ] | EXTERNAL NAME }::= [ ENCRYPTION ] [ EXECUTE AS Clause ]::= assembly_name.class_name.method_name 以下是一个例子 set ANSI_NULLS ONset QUOTED_IDENTIFIER ONgo -- =============================================-- Author: gsoosg-- Create date: 2007-12-24-- Description:-- =============================================CREATE TRIGGER [Trigger_Add_Carduser]ON [dbo].[carduser]AFTER INSERTASBEGIN-- SET NOCOUNT ON added to prevent extra result sets from-- interfering with SELECT statements.SET NOCOUNT ON;set insert ParkFee.dbo.card_user(card_user_id,card_user_name,sex)select card_user_id,card_user_name,sex from insertedEND说明：上例实现了为当前数据库中表carduser创建触发器当插入数据时，同步向ParkFee数据库表dbo.card_user插入数据，从而达到同步插入。类同，可将insert语句改为update，delete。注意:若想利用此方法达到反向同步则可能出现问题，比如想在parkfee数据库有新数据插入时让当前数据库也同时插入一条记录，建立一个触发器，则形成了一个循环触发，当插入数据时会报大于最大递归次数错。因此因避免这样的触发循环，若要达到类似效果还须想别的方法。