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#
# 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.
from sqlalchemy import create_engine
import sqlalchemy.orm
from sqlalchemy.orm import exc
from apigateway.db import models as db_models
_ENGINE = None
_SESSION_MAKER = None
def get_engine():
global _ENGINE
if _ENGINE is not None:
return _ENGINE
_ENGINE = create_engine('sqlite:///webdemo.db')
return _ENGINE
def get_session_maker(engine):
global _SESSION_MAKER
if _SESSION_MAKER is not None:
return _SESSION_MAKER
_SESSION_MAKER = sqlalchemy.orm.sessionmaker(bind=engine)
return _SESSION_MAKER
def get_session():
engine = get_engine()
maker = get_session_maker(engine)
session = maker()
return session
class Connection(object):
def __init__(self):
pass
def get_user(self, user_id):
query = get_session().query(db_models.User).filter_by(user_id=user_id)
try:
user = query.one()
except exc.NoResultFound:
# TODO(developer): process this situation
pass
return user
def list_users(self):
session = get_session()
query = session.query(db_models.User)
users = query.all()
return users
def update_user(self, user):
pass
def delete_user(self, user):
pass
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