def insertRuleset(self, ruleset, domain):
		'''增加一个robots.txt规则集'''
		cur = self.conn.cursor()
		cur.execute("SELECT did FROM Domains WHERE domain=?", (domain,))
		did = cur.fetchone()[0]
		cur.execute("INSERT INTO Rulesets VALUES (NULL,?,?)",(did, ruleset))
		# 写入到文件
		self.conn.commit()
def delete(self, force_drop=False, *args, **kwargs):
        """
        Deletes this row. Drops the tenant's schema if the attribute
        auto_drop_schema set to True.
        """
        self._drop_schema(force_drop)
        super().delete(*args, **kwargs)