70 lines
2.4 KiB
Python
70 lines
2.4 KiB
Python
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# -*- coding: UTF-8 -*-
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#
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# Copyright (C) 2007 by Jan Dittberner.
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful, but
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# WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
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# USA.
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#
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# Version: $Id$
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from sqlalchemy import *
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from gnuviechadmin.exceptions import *
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from BackendEntity import *
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class BackendEntityHandler(object):
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def __init__(self, entityclass, verbose = False):
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self.entityclass = entityclass
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self.verbose = verbose
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def create(self, **kwargs):
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try:
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entity = self.entityclass(self.verbose, **kwargs)
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sess = create_session()
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sess.save(entity)
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sess.flush()
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try:
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entity.create_hook()
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except:
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sess.delete(entity)
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sess.flush()
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raise
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except Exception, e:
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raise CreationFailedError(self.entityclass.__name__, e)
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def fetchall(self):
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"""Fetches all entities of the managed entity type."""
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session = create_session()
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query = session.query(self.entityclass)
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allentities = query.select()
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for entity in allentities:
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BackendEntity.__init__(entity, self.verbose)
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return allentities
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def delete(self, pkvalue):
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"""Deletes the entity of the managed entity type that has the
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specified primary key value."""
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try:
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sess = create_session()
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entity = sess.query(self.entityclass).get(pkvalue)
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if entity:
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BackendEntity.__init__(entity, self.verbose)
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if self.verbose:
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print "delete %s" % (str(entity))
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entity.delete_hook()
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sess.delete(entity)
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sess.flush()
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except Exception, e:
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raise DeleteFailedError(self.entityclass.__name__, e)
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