neutron/neutron/db/api.py
Salvatore Orlando 5d389270d9 Remove global DB_ENGINE from Neutron
Related-Bug 1207402

This global is not used anymore as it's been replaced by a similar
global variable in neutron/openstack/common/db/sqlalchemy/session.py

Change-Id: Id4614069af490020d18f14011853787930076e0a
2013-08-05 08:51:16 -07:00

71 lines
2.2 KiB
Python

# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2011 Nicira Networks, Inc.
# All Rights Reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
# @author: Somik Behera, Nicira Networks, Inc.
# @author: Brad Hall, Nicira Networks, Inc.
# @author: Dan Wendlandt, Nicira Networks, Inc.
import sqlalchemy as sql
from neutron.db import model_base
from neutron.openstack.common.db.sqlalchemy import session
from neutron.openstack.common import log as logging
LOG = logging.getLogger(__name__)
BASE = model_base.BASEV2
def configure_db():
"""Configure database.
Establish the database, create an engine if needed, and register
the models.
"""
session.get_engine(sqlite_fk=True)
register_models()
def clear_db(base=BASE):
unregister_models(base)
session.cleanup()
def get_session(autocommit=True, expire_on_commit=False):
"""Helper method to grab session."""
return session.get_session(autocommit=autocommit,
expire_on_commit=expire_on_commit,
sqlite_fk=True)
def register_models(base=BASE):
"""Register Models and create properties."""
try:
engine = session.get_engine(sqlite_fk=True)
base.metadata.create_all(engine)
except sql.exc.OperationalError as e:
LOG.info(_("Database registration exception: %s"), e)
return False
return True
def unregister_models(base=BASE):
"""Unregister Models, useful clearing out data before testing."""
try:
engine = session.get_engine(sqlite_fk=True)
base.metadata.drop_all(engine)
except Exception:
LOG.exception(_("Database exception"))