def close(self):
		'''关闭与数据库的连接'''
		if VERBOSE:
			print 'Database connection CLOSE.'
		self.conn.close()
def getUseageMessage(self):
        return ("- TECHORANGE -\n"
                "useage:\n"
                "index - download entry page of TECHORANGE \n"
                "tag - download not obtained tag page \n"
                "news [tag] - download not obtained news [of given tag] \n")