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gnuviechadmin-historic/gnuviechadmin/backend/BackendEntityHandler.py

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# -*- coding: UTF-8 -*-
#
# Copyright (C) 2007 by Jan Dittberner.
#
# This program 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 2 of the License, or
# (at your option) any later version.
#
# This program 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 this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
# USA.
#
# Version: $Id$
from sqlalchemy import *
from gnuviechadmin.exceptions import *
from BackendEntity import *
class BackendEntityHandler(object):
def __init__(self, entityclass, verbose = False):
self.entityclass = entityclass
self.verbose = verbose
def create(self, **kwargs):
# try:
sess = create_session()
entity = self.entityclass(self.verbose, **kwargs)
try:
entity.create_hook()
sess.save(entity)
sess.flush()
except:
sess.delete(entity)
sess.flush()
raise
# except Exception, e:
# raise CreationFailedError(self.entityclass.__name__, e)
def fetchall(self):
"""Fetches all entities of the managed entity type."""
session = create_session()
query = session.query(self.entityclass)
allentities = query.select()
for entity in allentities:
BackendEntity.__init__(entity, self.verbose)
return allentities
def delete(self, pkvalue):
"""Deletes the entity of the managed entity type that has the
specified primary key value."""
try:
sess = create_session()
entity = sess.query(self.entityclass).get(pkvalue)
if entity:
BackendEntity.__init__(entity, self.verbose)
if self.verbose:
print "delete %s" % (str(entity))
entity.delete_hook()
sess.delete(entity)
sess.flush()
except Exception, e:
raise DeleteFailedError(self.entityclass.__name__, e)