class PayementParametersMapper(object):
    """Provide a mapper for the parameters of a paiement"""
    _db = create_engine(getBaseForMapping())
    print 'DATABASE', getBaseForMapping()
    _metadata = BoundMetaData(_db)
    _mappingTable = Table('connectors', _metadata,
                          Column('id', String(25), primary_key=True),
                          Column('const', String(50)),
                          Column('parameters', TEXT))
    _mapper = mapper(PayementParameters, _mappingTable)
    _session = create_session()

    def __new__(cls):
        self = super(PayementParametersMapper, cls).__new__(cls)
        try:
            self._mappingTable.create()
        except exceptions.SQLError:
            pass
        return self

###################CODE DE L'__init__

from connectors import connectors
from payementselector import payementselector

from transactionstack import Transaction, TransactionStack


##PROBLEME : l'__init__ instancie deja les classes contenues dans persistence, ce qui fait que je peux pas les redefinir