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db.py
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db.py
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# Copyright 2013 Donald Stufft
#
# 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 __future__ import absolute_import, division, print_function
from __future__ import unicode_literals
import sqlalchemy
metadata = sqlalchemy.MetaData()
def scalar(query, default=None):
"""
A helper function that takes a query and returns a function that will query
the database and return a scalar.
"""
def scalar_inner(model, *args, **kwargs):
with model.engine.connect() as conn:
val = conn.execute(query, *args, **kwargs).scalar()
if default is not None and val is None:
return default
else:
return val
return scalar_inner