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# Copyright (C) 2015-2016 by the Free Software Foundation, Inc.
#
# This file is part of GNU Mailman.
#
# GNU Mailman is free software: you can redistribute it and/or modify it under
# the terms of the GNU General Public License as published by the Free
# Software Foundation, either version 3 of the License, or (at your option)
# any later version.
#
# GNU Mailman is distributed in the hope that it will be useful, but WITHOUT
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
# FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
# more details.
#
# You should have received a copy of the GNU General Public License along with
# GNU Mailman. If not, see <http://www.gnu.org/licenses/>.
"""Common database helpers."""
import sqlalchemy as sa
from public import public
@public
def is_sqlite(bind):
return bind.dialect.name == 'sqlite'
@public
def is_mysql(bind):
return bind.dialect.name == 'mysql'
@public
def exists_in_db(bind, tablename, columnname=None):
md = sa.MetaData()
md.reflect(bind=bind)
if columnname is None:
return tablename in md.tables
else:
return (
tablename in md.tables and
columnname in [c.name for c in md.tables[tablename].columns]
)
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