通过触发器实现数据库的即时同步

--即时同步两个表的实例:

--测试环境:SQL2000,远程主机名:xz,用户名:sa,密码:无,数据库名:test

--创建测试表,不能用标识列做主键,因为不能进行正常更新
--在本机上创建测试表,远程主机上也要做同样的建表操作,只是不写触发器
if exists (select * from dbo.sysobjects where id = object_id(N@#[test]@#) and OBJECTPROPERTY(id, N@#IsUserTable@#) = 1)
drop table [test]

create table test(id int not null constraint PK_test primary key
 ,name varchar(10))
go

--创建同步的触发器
create trigger t_test on test
for insert,update,delete
as
set  XACT_ABORT on
--启动远程服务器的MSDTC服务
exec master..xp_cmdshell @#isql /S"xz" /U"sa" /P"" /q"exec master..xp_cmdshell @#@#net start msdtc@#@#,no_output"@#,no_output

--启动本机的MSDTC服务
exec master..xp_cmdshell @#net start msdtc@#,no_output

--进行分布事务处理,如果表用标识列做主键,用下面的方法
BEGIN DISTRIBUTED TRANSACTION
delete from openrowset(@#sqloledb@#,@#xz@#;@#sa@#;@#@#,test.dbo.test)
 where id in(select id from deleted)
insert into openrowset(@#sqloledb@#,@#xz@#;@#sa@#;@#@#,test.dbo.test)
 select * from inserted
commit tran
go

--插入数据测试
insert into test
select 1,@#aa@#
union all select 2,@#bb@#
union all select 3,@#c@#
union all select 4,@#dd@#
union all select 5,@#ab@#
union all select 6,@#bc@#
union all select 7,@#ddd@#

--删除数据测试
delete from test where id in(1,4,6)

--更新数据测试
update test set name=name+@#_123@# where id in(3,5)

--显示测试的结果
select * from test a full join
openrowset(@#sqloledb@#,@#xz@#;@#sa@#;@#@#,test.dbo.test) b on a.id=b.id


 

原文转自：http://www.ltesting.net