Mybatis分頁插件 設置排序com.github.pagehelper.PageHelper (Mysql)

// 設置排序（默認按ID順序）
        String orderBy = "ID ASC";
        String orderByElementCode = dto.getOrderBy();
        if (StringUtils.isNotBlank(orderByElementCode)) {
            String orderByElementName = NutrientElementsEnum.getValue(orderByElementCode);
            String orderByElementField = NutrientElementsFieldEnum.getValue(orderByElementName);
            String orderStr = String.format("(CASE %s WHEN -1 THEN 2147483647 ELSE %s END)", orderByElementField, orderByElementField);
            String ifDesc = dto.getIsAsc() ? " ASC" : " DESC";
            orderBy = orderStr + ifDesc + "," + orderBy;
        }
        Page page = PageHelper.startPage(pageNo, pageSize, orderBy);
OrderQueryDTO baseDTO = getOrderQueryDTO (dto, elementField)
        List<orderDTO> vos = orderMapper.selectList(baseDTO);

 結果:

select * from where order_code = ? order by (CASE age WHEN -1 THEN 2147483647 ELSE age END) ASC,ID ASC LIMIT ?