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 paged_search(self, **kwargs):
                self.connection.search(search_base=kwargs.get("search_base"),
                                       search_scope=kwargs.get("search_scope"),
                                       search_filter=kwargs.get(
                                           "search_filter"),
                                       attributes=kwargs.get("attributes"),
                                       paged_size=kwargs.get("page_size"),
                                       size_limit=kwargs.get("size_limit"),
                                       paged_cookie=None)
                result = self.connection.response
                if kwargs.get("generator", False):
                    # If ``generator=True`` is passed, ``paged_search`` should return an iterator.
                    result = iter(result)
                return result