def robotsrulesetOfDomain(self, domain):
		'''检查domain是否在数据库中,
			否 --> (False, None)
			是 --> (True, 数据库中存储的robots.txt内容)
		'''
		exist = False
		cur = self.conn.cursor()
		# 是否存在
		cur.execute("SELECT 1 FROM Domains WHERE domain=?", (domain,))
		if cur.fetchone() :
			exist = True
		# 存在的话,结果是什么
		cur.execute("SELECT rules FROM Domains,Rulesets "
			"WHERE domain=? AND Domains.did=Rulesets.did"
			,(domain,) )
		ruleset = cur.fetchone()
		return (exist, ruleset)
def __eq__(self, other):
        if isinstance(other, self.__class__):
            return self.ip_addr == other.ip_addr
        elif hasattr(other, "ip4") and hasattr(other, "ip6"):
            # vl_api_address_union_t
            if 4 == self.version:
                return self.ip_addr == other.ip4
            else:
                return self.ip_addr == other.ip6
        else:
            raise Exception("Comparing VppIpAddressUnions:%s"
                            " with incomparable type: %s",
                            self, other)