The code is in oslo-incubator here:
https://github.com/openstack/oslo-incubator/blob/2013.2.b3/openstack/common/db/sqlalchemy/session.py#L604
The code is in oslo-incubator here:
https:/ /github. com/openstack/ oslo-incubator/ blob/2013. 2.b3/openstack/ common/ db/sqlalchemy/ session. py#L604