insert through function only

[Marvin McNett <mmcnett@cs.ucsd.edu>]

How do I go about ensuring that data is only added to a table through a 
function?  I've tried granting execute persission on the function which 
inserts data, but can't get it to work unless the user also has insert 
permission on the table.  I don't want the user to be able to 
arbitrarily insert data.


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