[Zope] Oracle Stored Procedures and Transactions

[alan runyan]

I have a Script (Python) that does the following:
   stored_proc.AddUser
   stored_proc.AddTrees
   does some funky Python stuff
   zsqlmethod.insertPermissions

I've had cases that my insertPermissions explode but the stored procedures
have committed their data -- regardless of the transaction needing to be
rolled back.  In ZOPE, am I correct that everything inside a Request is in
one Transaction (btw, how do you demarcate transactions?).  Am I missing
something?  I am expecting that everything would be rolled back on a
exception but it appears not.

~runyaga