def updateInfo(self, item, newlinks, oldlinks):
		'''爬虫爬完之后对数据库内容进行更新'''
		cur = self.conn.cursor()
		cur.execute("SELECT wid,did FROM Websites WHERE url=?", (item['url'],))
		wid, did = cur.fetchone()
		# website记录更新
		cur.execute("UPDATE Websites SET title=?,visited=1 WHERE wid=?", (item['title'], wid,))
		# 对应的domain记录中出度也需要更新
		cur.execute("UPDATE Domains SET outdegree=outdegree+? WHERE did=?", (len(item['links']), did,))

		# 对该网页中所有链接涉及的记录进行更新
		# 外部判断未出现过的链接
		for link,domain in newlinks:
			self.insertWebsite(link, domain)

		# 外部判断出现过的链接
		for link,domain in oldlinks:
			# 对对应的domain记录入度增加
			cur.execute("UPDATE Domains SET outdegree=outdegree+1 WHERE domain=?", (domain,))
		# 写入到文件
		self.conn.commit()
def cell_edited_callback(self, text_cell, path, new_text):
        """If a backend name is changed, it saves the changes in the Backend

        @param text_cell: not used. The Gtk.CellRendererText that emitted the
                          signal. Only here because it's passed by the signal
        @param path: the Gtk.TreePath of the edited cell
        @param new_text: the new name of the backend
        """
        # we strip everything not permitted in backend names
        new_text = ''.join(c for c in new_text if (c.isalnum() or c in [" ", "-", "_"]))
        selected_iter = self.liststore.get_iter(path)
        # update the backend name
        backend_id = self.liststore.get_value(selected_iter,
                                              self.COLUMN_BACKEND_ID)
        backend = self.dialog.get_requester().get_backend(backend_id)
        if backend:
            backend.set_human_name(new_text)
            # update the text in the liststore
            self.liststore.set(selected_iter, self.COLUMN_TEXT, new_text)