public JSONObject queryBindList (String userId, Map<String, String> optional) 
	{
		this.resetErrorStatus( );
		try 
		{
            Map<String, String> args = new HashMap<String, String>(optional);
            args.put(USER_ID, userId);
            String[] needArray = {USER_ID};
            args = prepareArgs(needArray, args);
            args.put(METHOD, "query_bindlist");
			return this.commonProcess(args);
		} 
		catch (ChannelException ex ) 
		{
			this.channelExceptionHandler (ex);
			return null; 
		}
	}