87 lines
3.2 KiB
Python
87 lines
3.2 KiB
Python
# -*- 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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import sqlalchemy, logging
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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, toclass, verbose = False):
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self.logger = logging.getLogger("%s.%s" % (
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self.__class__.__module__, self.__class__.__name__))
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self.entityclass = entityclass
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self.toclass = toclass
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self.verbose = verbose
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def create(self, **kwargs):
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"""Create a new entity of the managed type with the fields set
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to the values in kwargs."""
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self.logger.debug("create with params %s", str(kwargs))
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sess = sqlalchemy.create_session()
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transaction = sess.create_transaction()
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delegate = self.toclass(**kwargs)
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entity = self.entityclass(delegate, self.verbose)
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try:
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sess.save(delegate)
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sess.flush()
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sess.refresh(delegate)
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entity.create_hook(sess)
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sess.flush()
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transaction.commit()
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except:
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transaction.rollback()
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self.logger.exception("Exception in create.")
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raise
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def fetchall(self, **kwargs):
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"""Fetches all entities of the managed entity type."""
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self.logger.debug("fetchall with params %s", str(kwargs))
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session = sqlalchemy.create_session()
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query = session.query(self.toclass)
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if kwargs:
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allentities = query.select_by(**kwargs)
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else:
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allentities = query.select()
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return [self.entityclass(entity, self.verbose) \
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for entity in 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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self.logger.debug("delete with primary key %s", str(pkvalue))
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sess = sqlalchemy.create_session()
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transaction = sess.create_transaction()
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try:
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to = sess.query(self.toclass).get(pkvalue)
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if to:
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entity = self.entityclass(to, self.verbose)
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self.logger.info("delete %s", str(entity))
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if self.verbose:
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print "delete %s" % (str(entity))
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entity.delete_hook(sess)
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sess.delete(to)
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sess.flush()
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transaction.commit()
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except Exception, e:
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transaction.rollback()
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self.logger.exception("Exception in delete.")
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raise
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