如何获得Oracle参与SQL的字段列表?

I am writing a small application that user can type in the SQL and get the result. I noticed that my application cannot deal with XMLTYPE columns (I am using ADO). Is it possible to “ask” oracle what are the fields that participate in the select part of the SQL, so I can replace XMLTYPE fields with “getclobval()” function on the fly?I am writing a small application that user can