# -*- coding: utf-8 -*-
#
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you 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 flask_sqlalchemy import SQLAlchemy as BaseSqlAlchemy
from contextlib import contextmanager


class SQLAlchemy(BaseSqlAlchemy):
    @contextmanager
    def auto_rollback(self):
        try:
            yield
            self.session.commit()
            print 'commit'
        except Exception as e:
            self.session.rollback()
            print 'rollback'
            raise e
