[Zope] Re:updating a form from itself

I have a booking form whose contents are generated from a ZSQL method. The user then uses this form to place another booking. How can I send the new data to another ZSQL method to update the database and then change the same form to reflect the new booking and present this to the user as confirmation. I am OK on using variables in ZSQL it is the mechanics of the submit that i need to know. regards garry