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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# 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.
"""SQLAlchemy ORM connectivity and query structures.
"""
from oslo_utils import timeutils
import sqlalchemy.orm
from oslo_db.sqlalchemy import update_match
class Query(sqlalchemy.orm.query.Query):
"""Subclass of sqlalchemy.query with soft_delete() method."""
def soft_delete(self, synchronize_session='evaluate'):
entity = self.column_descriptions[0]['entity']
return self.update({'deleted': entity.id,
'updated_at': entity.updated_at,
'deleted_at': timeutils.utcnow()},
synchronize_session=synchronize_session)
def update_returning_pk(self, values, surrogate_key):
"""Perform an UPDATE, returning the primary key of the matched row.
This is a method-version of
oslo_db.sqlalchemy.update_match.update_returning_pk(); see that
function for usage details.
"""
return update_match.update_returning_pk(self, values, surrogate_key)
def update_on_match(self, specimen, surrogate_key, values, **kw):
"""Emit an UPDATE statement matching the given specimen.
This is a method-version of
oslo_db.sqlalchemy.update_match.update_on_match(); see that function
for usage details.
"""
return update_match.update_on_match(
self, specimen, surrogate_key, values, **kw)
class Session(sqlalchemy.orm.session.Session):
"""oslo.db-specific Session subclass."""
def get_maker(engine, autocommit=True, expire_on_commit=False):
"""Return a SQLAlchemy sessionmaker using the given engine."""
return sqlalchemy.orm.sessionmaker(bind=engine,
class_=Session,
autocommit=autocommit,
expire_on_commit=expire_on_commit,
query_cls=Query)
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