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