c87ae92be5
Previously this let you replace our SQLAlchemy database layer with your own. This approach is deprecated. Deployments that felt the need to use the facility are encourage to work with upstream Nova to address db driver concerns in the main SQLAlchemy code paths. Change-Id: If195a6bc399c8b1e2bfb0ea5579f2be21d0bc126
45 lines
1.6 KiB
Python
45 lines
1.6 KiB
Python
# Copyright 2010 United States Government as represented by the
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# Administrator of the National Aeronautics and Space Administration.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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"""Base class for classes that need modular database access."""
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from oslo_config import cfg
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from oslo_utils import importutils
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# NOTE(sdague): we know of at least 1 instance of out of tree usage
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# for this config in RAX. They used this because of performance issues
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# with some queries. We think the right path forward is fixing the
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# SQLA queries to be more performant for everyone.
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db_driver_opt = cfg.StrOpt(
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'db_driver',
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default='nova.db',
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help='DEPRECATED: The driver to use for database access',
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deprecated_for_removal=True)
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CONF = cfg.CONF
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CONF.register_opt(db_driver_opt)
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class Base(object):
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"""DB driver is injected in the init method."""
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def __init__(self, db_driver=None):
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super(Base, self).__init__()
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if not db_driver:
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db_driver = CONF.db_driver
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self.db = importutils.import_module(db_driver)
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