In T-SQL can you use a variable with the USE command

I'm working on a SQL script whe开发者_JS百科re I need to refer to the database name in multiple stops. This script will be used to run against different databases so I wanted to store the database name in a variable so you only need to change the name in one location in the script.

The main problem I have with this script is with the USE command. So the code looks like.

DECLARE @DBName varchar(50)
SET @DBName = '[master]'

USE @DBName

SQL doesn't like this. Is there a way to do this.

Thanks for the help.

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You can do something like this

declare @dbname varchar(250)
declare @Sql varchar(250)

set @dbname='PMDB'

SELECT @Sql ='select * from ' + @dbname + '.dbo.Account'


EXEC(@Sql)

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The way I do this is not very elegant, but it works just fine

if @DBName = 'DB1'
    <query with DB1>
else
    <query with DB2>