def exportValue(self, vf, value):
        m = StrStrHashMap(value)
        keysAndValues = []
        for i in m.keys():
            keysAndValues.append(i)
            keysAndValues.append(m[i])
def get_bind(self, mapper=None, *args, **kwargs):
                    return super(MySession, self).get_bind(
                        mapper, *args, **kwargs
                    )