From a quick reading of the 'transaction' package source, it looks like
you should be able to create savepoints and roll them back something
like this:
savepoint = transaction.savepoint()
try:
# ...
except:
savepoint.rollback()
raise
Thanks for the interest in helping. I had already gone down that road
and abandoned it when I realized it wasn't playing nicely with
sqlalchemy session:
>>> a=TranCode()
>>> a.transactioncodeid='PMT'
>>> sp=transaction.savepoint()
>>> DBSession.add(a)
>>> DBSession.flush()
15:53:52,852 INFO [sqlalchemy.engine.base.Engine.0x...88d0] SAVEPOINT
sa_savepoint_1
15:53:52,853 INFO [sqlalchemy.engine.base.Engine.0x...88d0] {}
/home/rarch/tg2env/lib/python2.6/site-packages/SQLAlchemy-0.6.0.2-py2.6-linux-x86_64.egg/sqlalchemy/engine/default.py:500:
SAWarning: Unicode type received non-unicode bind param value 'PMT'
param[key.encode(encoding)] = processors[key](compiled_params[key])
15:53:52,855 INFO [sqlalchemy.engine.base.Engine.0x...88d0] INSERT INTO
trancodes (transactioncodeid, description, debitorcredit, posttogl,
userdefined, codetype) VALUES (:transactioncodeid, :description,
:debitorcredit, :posttogl, :userdefined, :codetype)
15:53:52,855 INFO [sqlalchemy.engine.base.Engine.0x...88d0]
{'description': None, 'userdefined': None, 'transactioncodeid': 'PMT',
'codetype': None, 'debitorcredit': None, 'posttogl': None}
after flush!!
>>> sp.rollback()
15:53:52,859 INFO [sqlalchemy.engine.base.Engine.0x...88d0] ROLLBACK TO
SAVEPOINT sa_savepoint_1
15:53:52,860 INFO [sqlalchemy.engine.base.Engine.0x...88d0] {}
Traceback (most recent call last):
File "<console>", line 1, in <module>
File
"/home/rarch/tg2env/lib/python2.6/site-packages/transaction-1.0a1-py2.6.egg/transaction/_transaction.py",
line 662, in rollback
transaction._saveAndRaiseCommitishError() # reraises!
File
"/home/rarch/tg2env/lib/python2.6/site-packages/transaction-1.0a1-py2.6.egg/transaction/_transaction.py",
line 659, in rollback
savepoint.rollback()
File
"/home/rarch/tg2env/lib/python2.6/site-packages/zope.sqlalchemy-0.4-py2.6.egg/zope/sqlalchemy/datamanager.py",
line 147, in rollback
self.session.clear() # remove when Session.rollback does an
attribute_manager.rollback
AttributeError: 'Session' object has no attribute 'clear'
>>>
Apparently I need to look into whether zope has a SQLA 0.6.0 compatible release
yet...looks to be trying to call session.clear
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