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Using transaction locks in SQL Server 2012

Hi Experts,
I have written a stored procedure that executes an SSIS package in my SQL Server 2012 database.  The SSIS package loads data from a file into a table when executed.  If there is data in the table, it deletes the existing data and then writes the new data to the table.  This was a great solution when only one user was using the stored procedure.  Now more users are using this feature, and could possibly use it simultaneously.  I need to somehow lock the execution of the stored procedure, if another user is in the middle of running it.  How can I do this?  Do I need to add syntax in my stored procedure that would prevent this from happening?

Thanks in advance,
mrotor
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mainrotor
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mainrotor
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Scott PletcherSenior DBACommented:
Rather than locking out the stored proc, you could add the username as a clustering key to the table.  When a new user runs the proc, only rows with that username are deleted.  That should allow multiple users to use the proc at the same time.  It's a lot of code and a real hassle to restrict procs to 1-up use.
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mainrotorAuthor Commented:
That sounds like a good idea.  How would I add the username as a clustering key to the table?  How would I delete rows with only that user's name on it?  
Would I have to recreate my SSIS package (since that's where the deletion happens)?

thanks,
mrotor
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Scott PletcherSenior DBACommented:
>> How would I add the username as a clustering key to the table? <<

Good q :-).  It depends; hopefully it's possible.

Check "SELECT ORIGINAL_LOGIN()" for each user and see what it's value is.  If that doesn't come in, maybe you can use "HOST_NAME()".  Or if you have their unique AD name.

Anything that gives you an absolutely unique string for that user.

Then, where your package currently does this:

DELETE FROM dbo.table_name

You change it to:

DELETE FROM dbo.table_name WHERE user_name_column = @current_user_name

or the equivalent.
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