transaction as context manager, exception during commit

Hi Jim,

The current __exit__ for transaction managers looks like this:

     def __exit__(self, t, v, tb):
         if v is None:
             self.commit()
         else:
             self.abort()

..which means that if you're using the transaction package as a context 
manager and, say, a relational database integrity constraint is 
violated, then you're left with a hosed transaction that still needs 
aborting.

How would you feel about the above changing to:

     def __exit__(self, t, v, tb):
         if v is None:
             try:
                 self.commit()
             except:
                 self.abort()
                 raise
         else:
             self.abort()

If this is okay, I'll be happy to write the tests and make the changes 
provided someone does a release when I have...

cheers,

Chris

-- 
Simplistix - Content Management, Batch Processing & Python Consulting
            - http://www.simplistix.co.uk
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