make server name as a variable - sql

Question

I am trying to get data from different sever, and the sever name might change. So I set the server name as a parameter. The idea of my sql store procedure is something like this
CREATE PROCEDURE [dbo].[GetData]
#ServerName
AS
BEGIN
SELECT * FROM #ServerName.ClientDataBase.dbo.Client
END
Does anyone know how to achieve this?
The database version is sql server 2005

Answer 1

Use dynamic SQL, however evil this may be:
exec('select * from ' + #ServerName + '.ClientDatabase.dbo.Client')

Answer 2

Look at using Synonym(s)
Create syntax (from MSDN):
CREATE SYNONYM [ schema_name_1. ] synonym_name FOR < object >
< object > :: =
{
[ server_name.[ database_name ] . [ schema_name_2 ].|
database_name . [ schema_name_2 ].| schema_name_2. ] object_name
}

Answer 3

You could set up a linked server, says "BOB".
Then you could call sp_setnetname to change the underlying target server but keep the name BOB.
So your code would be:
CREATE PROCEDURE [dbo].[GetData]
#ServerName
AS
BEGIN
EXEC sp_setnetname 'BOB', #ServerName
SELECT * FROM BOB.ClientDataBase.dbo.Client
END

Answer 4

-- Proc to get remove server name (domaine+instance name)
IF OBJECT_ID('dbo.getRemoteName') IS NOT NULL
DROP PROC dbo.getRemoteName;
GO
CREATE PROC dbo.getRemoteName
#id AS INT,
#RETURN AS VARCHAR(100) OUTPUT
AS
BEGIN
DECLARE #GetInstances TABLE
( id INT IDENTITY(0,1),
VALUE NVARCHAR(100),
instanceName NVARCHAR(100),
DATA NVARCHAR(100))
INSERT INTO #GetInstances
EXECUTE xp_regread
#rootkey = 'HKEY_LOCAL_MACHINE',
#KEY = 'SOFTWAREMicrosoftMicrosoft SQL Server',
#value_name = 'InstalledInstances'
-- order ascendant
-- Select * from #GetInstances -- uncomment to see all the instances that your have
SELECT #RETURN=instanceName FROM #GetInstances WHERE id=#id ORDER BY instanceName ASC;
SET #RETURN=HOST_NAME()+''+#RETURN;
END;
GO
DECLARE #RETURN AS VARCHAR(100);
-- get the instance number 0
EXEC getRemoteName 0, #RETURN OUTPUT;
PRINT #RETURN;
--
exec('SELECT * FROM ['+#RETURN+'].RemoteDatabase.dbo.SampleTable');