fpdb/pyfpdb/AlchemyFacilities.py

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Python
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2010-07-08 20:01:03 +02:00
#!/usr/bin/python
# -*- coding: utf-8 -*-
#Copyright 2009-2010 Grigorij Indigirkin
#This program is free software: you can redistribute it and/or modify
#it under the terms of the GNU Affero General Public License as published by
#the Free Software Foundation, version 3 of the License.
#
#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 Affero General Public License
#along with this program. If not, see <http://www.gnu.org/licenses/>.
#In the "official" distribution you can find the license in agpl-3.0.txt.
#TODO: gettextify if file is used again
from decimal_wrapper import Decimal
from sqlalchemy import types
from sqlalchemy.orm.exc import NoResultFound
from sqlalchemy.exc import IntegrityError
import Card
class CardColumn(types.TypeDecorator):
"""Stores cards as smallints
Automatically converts values like '9h' to smallint
>>> CardColumn().process_bind_param( 'Td', '' )
22
>>> CardColumn().process_bind_param( u'Td', '' )
22
>>> CardColumn().process_bind_param( 22, '' )
22
>>> CardColumn().process_result_value( 22, '' )
'Td'
"""
impl = types.SmallInteger
def process_bind_param(self, value, dialect):
if value is None or isinstance(value, int):
return value
elif isinstance(value, basestring) and len(value) == 2:
return Card.encodeCard(str(value))
else:
raise Exception, "Incorrect card value: " + repr(value)
def process_result_value(self, value, dialect):
return Card.valueSuitFromCard( value )
class MoneyColumn(types.TypeDecorator):
"""Stores money: bets, pots, etc
Understands:
Decimal as real amount
int as amount mupliplied by 100
string as decimal
Returns Decimal
>>> MoneyColumn().process_bind_param( 230, '' )
230
>>> MoneyColumn().process_bind_param( Decimal('2.30'), '' )
230
>>> MoneyColumn().process_bind_param( '2.30', '' )
230
>>> MoneyColumn().process_result_value( 230, '' )
Decimal('2.3')
"""
impl = types.Integer
def process_bind_param(self, value, dialect):
if value is None or isinstance(value, int):
return value
elif isinstance(value, basestring) or isinstance(value, Decimal):
return int(Decimal(value)*100)
else:
raise Exception, "Incorrect amount:" + repr(value)
def process_result_value(self, value, dialect):
if value is None:
return None
return Decimal(value)/100
class BigIntColumn(types.TypeDecorator, types.Integer):
"""Representing db-independent big integer """
# Integer inheritance required for auto_increment flag
impl = types.Integer
def load_dialect_impl(self, dialect):
from sqlalchemy import databases
if dialect.name == 'mysql':
return databases.mysql.MSBigInteger()
elif dialect.name == 'postgres':
return databases.mysql.PGBigInteger()
return types.Integer()
class MappedBase(object):
"""Provide dummy contrcutor"""
def __init__(self, **kwargs):
for k, v in kwargs.iteritems():
setattr(self, k, v)
def get_columns_names(self):
return [i.name for i in self._sa_class_manager.mapper.c]
def get_or_create(klass, session, **kwargs):
"""
Looks up an object with the given kwargs, creating one if necessary.
Returns a tuple of (object, created), where created is a boolean
specifying whether an object was created.
"""
assert kwargs, \
'get_or_create() must be passed at least one keyword argument'
try:
return session.query(klass).filter_by(**kwargs).one(), False
except NoResultFound:
try:
obj = klass(**kwargs)
session.add(obj)
session.flush()
return obj, True
except IntegrityError:
return session.query(klass).filter_by(**kwargs).one(), False