[Zope] - How can I get the column names from an SQL Method with DTML?

Hi everybody, I've been fascinated with Zope for 3 days already (thanks Digital Creations!) and here is my first serious problem: I would like to ease the creation of input forms for inserting data in a database. My plan is to be able to generate a form based on the fields of an already created SQL Method with a "select * from table" statement. My question is: how can I get the column names from the SQL method? I think I noticed that _searchable_result_columns() is used to get this information when creating a Search Interface. Is it possible to get it from DTML without using an External Method? Thanks, Plamen