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 closeEvent(self, event: QCloseEvent):
        settings.write("{}/geometry".format(self.__class__.__name__), self.saveGeometry())
        super().closeEvent(event)