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 closeCliConnectionTo(self):
        if self._connection == None:
            return
        self._exit_modes_beyond(-1)
        self.modeList = []
        self._debugLog("Exited all modes.")
        self.forceCloseCliConnectionTo()