sql use statement with variable

Question

I\'m trying to switch the current database with a SQL statement. I have tried the following, but all attempts failed:

1. USE @DatabaseName
2. EXEC sp_sqlexe

Answer 1

-- If you are using a variable for the database name. 
-- Try something like this. 

DECLARE @DBName varchar(50)
Set @DBName = 'Database1'; /*  could be passed in by a parameter. */

IF( @DBName = 'Database1')
Begin
    USE [Database1];
SELECT  FROM Table1;
End

IF( @DBName = 'Database2')
Begin
USE [Database2];
SELECT  FROM Table2;
End

IF( @DBName is null)
Begin
USE [Database1];
End