Question

The following is not working and I am definitely missing the obvious but would be nice if somebody could explain why is not working. I need to change db dynamically.

The print out looks good but does not change db in the SQL Server drop down.

DECLARE @tempSql nvarchar(4000);
DECLARE @FinalSQL nvarchar(4000);
DECLARE @dbName varchar(100);

SET @dbName = 'Pubs';
SET @tempSql = 'SELECT DB_NAME()';

SET @FinalSQL = 'USE ' + @dbName + '; EXEC sp_executesql N''' + @tempSql + '''';
EXEC (@FinalSQL)

Answer 1

If SQLCMD mode is an option for your (within SSMS, for example), you can do this:

:setvar dbname Pubs
USE [$(dbname)]
SELECT DB_NAME()

Or, your original syntax was pretty close. Try this:

DECLARE @db AS NVARCHAR(258);
SET @db = QUOTENAME(N'Pubs');
EXEC(N'USE ' + @db + N'; EXEC(''SELECT DB_NAME();'');');
GO