SQL Server 2008 - restrict user access

Is it possible to setup a user on SQL Server 2008 that can ONLY create records (via ADO/SQL from a client app. In my case Excel VBA) but not connect with SQL Server Management Studio?

Background: I'm creating an Excel VBA demo (that INSERTs records into a table) for open distribution. The connection string will be visible. I don't want anyone with those login credentials to be able to connect to the database and look inside.

Thanks
hindersalivaAsked:
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Robin SandlinCommented:
One solution i have used is to create a stored procedure in SQL server that accepts the parameters for the insert and does the insertion.  Then give the user rights only to Execute the stored procedure.  SQL Server stored procedures can be executed very easily from VBA modules in Excel.

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Robin SandlinCommented:
Regarding credentials, since both are Microsoft, you can use windows authentication to pass credentials so long as you set the user with Execute privilege on SQL server. This way credentials will not be seen.
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Microsoft SQL Server 2008

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