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 __init__(self, backendsdialog):
        """
        Constructor, just initializes the gtk widgets

        @param backends: a reference to the dialog in which this is
        loaded
        """
        super().__init__()
        self.dialog = backendsdialog
        self.req = backendsdialog.get_requester()
        self._init_liststore()
        self._init_renderers()
        self._init_signals()
        self.refresh()