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USE Statement with variable

Posted on 2007-11-22
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Last Modified: 2008-02-01
Hi,

i am trying to script the creation of a user and add it to a database like this:

declare @DbAttachName varchar(50);
SET @DbAttachName = 'test_script';
##USE @DbAttachName;##
CREATE USER [nvt] FOR LOGIN [nvt] WITH DEFAULT_SCHEMA=[dbo];
EXEC sp_addrolemember @rolename='db_owner',@membername='nvt';

the login was created succesfully, no problem there.
on the line with the ## there is an error. apparently the USE statement does not support variables.
when i try like this:
SET @SQL='USE ' + @DbAttachName;
EXEC (@SQL);
I get no error, but the database does not change...
i suppose it only changes the database in the "EXEC" statement, and not in the script itself.

How can i solve this?
The problem is, that the database is also attached in the same script (not when testing this)
so i can not fix the USE name.
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Question by:Joachim Carrein
2 Comments
 
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Accepted Solution

by:
Guy Hengel [angelIII / a3] earned 2000 total points
ID: 20333501
> apparently the USE statement does not support variables.
correct.

>when i try like this:
>SET @SQL='USE ' + @DbAttachName;
>EXEC (@SQL);
>I get no error, but the database does not change...
 actually, it is changed, but only in the scope of that dynamic sql.
so:
>i suppose it only changes the database in the "EXEC" statement, and not in the script itself.
correct



only way:

declare @DbAttachName varchar(50);
SET @DbAttachName = 'test_script'; 
declare @sql varchar(4000)
set @sql ='USE ' + @DbAttachName + '
CREATE USER [nvt] FOR LOGIN [nvt] WITH DEFAULT_SCHEMA=[dbo]
EXEC sp_addrolemember @rolename='db_owner',@membername='nvt'
'
EXEC(@sql)

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Author Comment

by:Joachim Carrein
ID: 20333604
that did the trick indeed. as i suspected the use is only in the scope. but i didn't think of executing those statements in the same scope :)
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