mysql分页查询

mysql分页查询，从0开始 向前台传递json数据 后台定义返回Map

<select id="selectByPage" resultType="Chapter">
        select *
        from cmfz_chapter where album_id=#{albumId} limit #{start},#{rows}
    </select>
    <select id="getCount" resultType="Integer">
        select count(id) from cmfz_chapter where album_id=#{albumId}
    </select>

		Map<String, Object> map = new HashMap<>();
        Integer records = chapterDao.getCount(albumId);
        Integer total=records%rows==0 ? records/rows : records/rows+1;
        Integer start=(page-1)*rows;
        List<Chapter> carousels = chapterDao.selectByPage(start, rows, albumId);
        map.put("total",total);
        map.put("records",records);
        map.put("page",page);
        map.put("rows",carousels);
        return map;