def delete(self, doc):
        if doc.id is None:
            raise DatabaseException('Document does not have id')
        if doc.sid is None:
            try:
                rs = self.db.docs.remove({'id': doc.id}, safe=True)
                assert rs['n'] == 1
            except Exception as e:
                raise DatabaseException(e)
            return None
        doc.data = None
        return self.update(doc)
def runSpider(self, lstSubcommand=None):
        strSubcommand = lstSubcommand[0]
        strArg1 = None
        if len(lstSubcommand) == 2:
            strArg1 = lstSubcommand[1]
        self.initDriver() #init selenium driver
        self.dicSubCommandHandler[strSubcommand](strArg1)
        self.quitDriver() #quit selenium driver