我在存储过程中可以连接多个数据库服务器吗？

[68467263]

数据库位于不同的地点，并且，我要从多个数据库服务器取回数据合并到一个临时表中。请问该如何实现？

[klan]

可以的，参考：sp_addlinkedserver (T-SQL)
Creates a linked server, which allows access to distributed, heterogeneous queries against OLE DB data sources. After creating a linked server with sp_addlinkedserver, this server can then execute distributed queries. If the linked server is defined as SQL Server, remote stored procedures can be executed.
Syntax

sp_addlinkedserver [@server =] 'server' [, [@srvproduct =] 'product_name']
[, [@provider =] 'provider_name'] [, [@datasrc =] 'data_source']
[, [@location =] 'location'] [, [@provstr =] 'provider_string']
[, [@catalog =] 'catalog']

Arguments

[@server =] 'server'

Is the name of the linked server to create. server is sysname, with no default.

[@srvproduct =] 'product_name'

Is the product name of the OLE DB data source to add as a linked server. product_name is nvarchar(128), with a default of NULL. If SQL Server, provider_name, data_source, location, provider_string, and catalog do not need to be specified.

[@provider =] 'provider_name'

Is the unique programmatic identifier (PROGID) of the OLE DB provider corresponding to this data source. provider_name must be unique for the specified OLE DB provider installed on the current computer. provider_name is nvarchar(128), with a default of NULL. The OLE DB provider is expected to be registered with the given PROGID in the registry.

[@datasrc =] 'data_source'

Is the name of the data source as interpreted by the OLE DB provider. data_source is nvarchar(4000), with a default of NULL. data_source is passed as the DBPROP_INIT_DATASOURCE property to initialize the OLE DB provider.

[@location =] 'location'

Is the location of the database as interpreted by the OLE DB provider. location is nvarchar(4000), with a default of NULL. location is passed as the DBPROP_INIT_LOCATION property to initialize the OLE DB provider.

[@provstr =] 'provider_string'

Is the OLE DB provider-specific connection string that identifies a unique data source. provider_string is nvarchar(4000), with a default of NULL. provstr is passed as the DBPROP_INIT_PROVIDERSTRING property to initialize the OLE DB provider.

[@catalog =] 'catalog'

Is the catalog to be used when making a connection to the OLE DB provider. catalog is sysname, with a default of NULL. catalog is passed as the DBPROP_INIT_CATALOG property to initialize the OLE DB provider.

Return Code Values

0 (success) or 1 (failure)

[zjcxc]

--访问不同电脑上的数据库(远程只要联好网就一样)

--如果经常访问或数据量大,建议用链接服务器

--创建链接服务器
exec sp_addlinkedserver 'srv_lnk','','SQLOLEDB','远程服务器名或ip地址'
exec sp_addlinkedsrvlogin 'srv_lnk','false',null,'用户名','密码'
go

--查询示例
select * from srv_lnk.数据库名.dbo.表名

--导入示例
select * into 表 from srv_lnk.数据库名.dbo.表名

go
--处理完成后删除链接服务器
exec sp_dropserver 'srv_lnk','droplogins'

[zjcxc]

--如果只是临时访问,可以直接用openrowset
--查询示例
select * from openrowset('sqloled'
,'sql服务器名';'用户名';'密码'
,数据库名.dbo.表名)


--导入示例
select * into 表 from openrowset('sqloled'
,'sql服务器名';'用户名';'密码'
,数据库名.dbo.表名)

[zjcxc]

--给个处理的例子给你参考:


--定时同步服务器上的数据(服务器上的数据修改同步到本地)

--测试环境,SQL Server2000,远程服务器名:rserver,用户名为:ruser,密码：rpwd,
测试数据库:test

--服务器上的表(查询分析器连接到服务器上创建)
--state字段为辅助更新而设置的附加字段,字段值说明:null 表示新增记录,1 表示修改过的记录,0 表示无变化的记录
if exists (select * from dbo.sysobjects where id = object_id(N'[luser]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [luser]
GO
create table [luser](id int identity(1,1) primary key,[user] varchar(4),pwd varchar(10),address varchar(50),state bit)
go

--创建触发器,维护state字段的值
create trigger t_state on [luser]
after update
as
update [luser] set state=1
from [luser] a join inserted b on a.id=b.id
where a.state is not null
go

----以下在局域网(本机操作)
if exists (select * from dbo.sysobjects where id = object_id(N'[luser]') and OBJECTPROPERTY(id, N'IsUserTable') = 1)
drop table [luser]
create table [luser](id int primary key,[user] varchar(4),pwd varchar(10),address varchar(50))
go

--为了方便同步处理,创建链接服务器到要同步的服务器
--这里的远程服务器名:rserver,用户名为:ruser,密码：rpwd
if exists(select 1 from master..sysservers where srvname='srv_lnk')
exec sp_dropserver 'srv_lnk','droplogins'
go
exec sp_addlinkedserver 'srv_lnk','','SQLOLEDB','rserver'
exec sp_addlinkedsrvlogin 'srv_lnk','false',null,'ruser','rpwd'
go

--创建同步处理的存储过程
if exists (select * from dbo.sysobjects where id = object_id(N'[dbo].[p_synchro]') and OBJECTPROPERTY(id, N'IsProcedure') = 1)
drop procedure [dbo].[p_synchro]
GO
create proc p_synchro
as
/*--因为MSDTC服务(分布式事务处理需要)工作不稳定,所以下面部分为选用内容
--set XACT_ABORT on
--启动远程服务器的MSDTC服务
--exec master..xp_cmdshell 'isql /S"rserver" /U"ruser" /P"rpwd" /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
--*/
--同步删除的数据
delete from [luser]
where id not in(select id from srv_lnk.test.dbo.[luser])

--同步新增的数据
insert into [luser]
select id,[user],pwd,address from srv_lnk.test.dbo.[luser]
where state is null

--同步修改的数据
update [luser] set
[user]=b.[user],pwd=b.pwd,address=b.address
from [luser] a
join srv_lnk.test.dbo.[user] b on a.id=b.id
where b.state=1

--同步后更新服务器上的标志
update srv_lnk.test.dbo.[luser] set state=0 where isnull(state,1)=1
--COMMIT TRAN --如果启用分布式事务处理,加上此句
go

--创建作业,定时执行数据同步的存储过程
if exists(SELECT 1 from msdb..sysjobs where name='数据处理')
EXECUTE msdb.dbo.sp_delete_job @job_name='数据处理'
exec msdb..sp_add_job @job_name='数据处理'

--创建作业步骤
declare @sql varchar(800),@dbname varchar(250)
select @sql='exec p_synchro' --数据处理的命令
,@dbname=db_name() --执行数据处理的数据库名

exec msdb..sp_add_jobstep @job_name='数据处理',
@step_name = '数据同步',
@subsystem = 'TSQL',
@database_name=@dbname,
@command = @sql,
@retry_attempts = 5, --重试次数
@retry_interval = 5 --重试间隔

--创建调度
EXEC msdb..sp_add_jobschedule @job_name = '数据处理',
@name = '时间安排',
@freq_type=4, --4 每天,8 每周,16 每月
@freq_interval=1, --作业执行的天数
@freq_subday_type=0, --是否重复执行,0x1 在指定的时间, 0x4 分钟, 0x8 小时
@freq_subday_interval=1, --重复周期
@freq_recurrence_factor=0, --重复执行,则设置为1,否则设置为0
@active_start_time = 00000 --0点开始执行

--添加目标服务器
EXEC msdb.dbo.sp_add_jobserver
@job_name = @jobname ,
@server_name = N'(local)'
go

[68467263]

非常感谢zjcxc(邹建)