The following python program fails at the sess.begin() line when
executed with autocommit set to False.
Specifically, when invoked with a database URI and an argument of 'no'
(or anything except 'yes' or 'true') the following exception is
raised:
sqlalchemy.exc.InvalidRequestError: A transaction is already begun.
Use subtransactions=True to allow subtransactions.
I am using sqlalchemy 0.6.5.
Both postgresql and sqlite fail.
What am I doing wrong?
#! /usr/bin/python
import sys
import logging
import sqlalchemy as sa
import sqlalchemy.orm as sa_orm
logging.basicConfig(level=logging.DEBUG)
logging.getLogger('sqlalchemy').setLevel(logging.DEBUG)
dburi = sys.argv[1]
if sys.argv[2].lower() in [ 'true', 'yes' ]:
autocommit = True
else:
autocommit = False
engine = sa.create_engine(dburi)
factory = sa_orm.sessionmaker(bind=engine, autocommit=autocommit,
autoflush=False)
meta = sa.MetaData()
meta.reflect(bind=engine)
sess = factory()
# if autocommit is False, this fails:
sess.begin()
--
Jon
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