def insertDomain(self, domain, indegree=0, outdegree=0):
		'''增加一个域名'''
		cur = self.conn.cursor()
		cur.execute("INSERT INTO Domains VALUES (NULL,?,?,?)", (domain, indegree, outdegree))
		# 写入到文件中
		self.conn.commit()
def profile_iterable(self, iterable: Iterable, action_name: str) -> Generator:
        iterator = iter(iterable)
        while True:
            try:
                self.start(action_name)
                value = next(iterator)
                self.stop(action_name)
                yield value
            except StopIteration:
                self.stop(action_name)
                break