
oracle db_link 和触发器实现不同数据库表的同步
---创建dblink,dblink_test名称,(被同步数据库的a_test)ST10766用户名,ep密码,ass100连接字符串
create public database link dblink_test
connect to ST10766 identified by ep
using 'ass100'
---删除dblink
----drop public database link dblink_test
----建立表
create table a_test (id int,name varchar(20),pass varchar(20))
select * from a_test
insert into a_test (id,name,pass) values (1,'zzn','shanshan')
insert into b_test (id,username,password) values('1','zxl','xiaolan')
----在目的数据库上,测试dblink,查询的是源数据库的表
select * from a_test@dblink_orc10
select * from a_test
----创建触发器
create or replace trigger a_b_test
after insert or update or delete
on a_test
for each row
begin
if deleting then
delete from b_test where id=:old.id
end if
if inserting then
insert into b_test(id,username,password) //b_test表的字段
values(:new.id,:new.name,:new.pass)//a_test表的字段
end if
if updating then
update b_test set username=:new.name,password=:new.pass where id=:old.id
end if
end a_b_test
--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 *** 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
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