def connect(self): 
        try:
            self.connection = pymongo.Connection(self.host, self.port)
            self.db = self.connection[self.name]
        except AutoReconnect:
            raise DatabaseException("It's not possible connect to the database")
def getLenp1(self):
        p2 = self.p2
        ret = p2.distance(self.p3)
        return ret