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+##############################################################################
+# Copyright (c) 2016 Huawei Technologies Co.,Ltd and others.
+#
+# All rights reserved. This program and the accompanying materials
+# are made available under the terms of the Apache License, Version 2.0
+# which accompanies this distribution, and is available at
+# http://www.apache.org/licenses/LICENSE-2.0
+##############################################################################
+import logging
+
+from sqlalchemy import create_engine
+from sqlalchemy.orm import scoped_session, sessionmaker
+from sqlalchemy.ext.declarative import declarative_base
+
+logger = logging.getLogger(__name__)
+logger.setLevel(logging.DEBUG)
+
+engine = create_engine('sqlite:////tmp/yardstick.db', convert_unicode=True)
+db_session = scoped_session(sessionmaker(autocommit=False,
+ autoflush=False,
+ bind=engine))
+Base = declarative_base()
+Base.query = db_session.query_property()
+
+
+def init_db():
+ subclasses = [subclass.__name__ for subclass in Base.__subclasses__()]
+ logger.debug('Import models: %s', subclasses)
+ Base.metadata.create_all(bind=engine)