这样只查询了一个表的，我怎么样查询出关联表单的字段显示在页面

    @At("/data")
    @Ok("json:full")
    @RequiresPermissions("platform.iff.article")
    public Object data(@Param("length") int length, @Param("start") int start, @Param("draw") int draw, @Param("::order") List<DataTableOrder> order, @Param("::columns") List<DataTableColumn> columns) {
		Cnd cnd = Cnd.NEW();

    	return iffArticleService.data(length, start, draw, order, columns, cnd, null);
    }

前台接受数据的

      "order": [[0, "desc"]],
            "columns": [
                    {"data": "channelId", "bSortable": true},
                    {"data": "title", "bSortable": true},
                    {"data": "authorId", "bSortable": true},//关联表的ID
                    {"data": "releaseDate", "bSortable": true},
                    {"data": "disabled", "bSortable": true},

            ],