mybatis-plus 使用 sql 分页

#分页工具类

/**
 * 分页参数处理
 */
public class PageUtil {
    /**
     * 分页返回数据封装
     *
     * @param page
     * @return Map<String, Object>
     * @author Hd
     * @date 2021/12/18 12:47
     */
    public static Map<String, Object> toPage(Page page) {
        Map<String, Object> map = new LinkedHashMap<>(2);
        map.put("pages", page.getPages());
        map.put("current", page.getCurrent());
        map.put("total", page.getTotal());
        map.put("list", page.getRecords());
        return map;
    }

    /**
     * 分页参数转化
     *
     * @param orderItems
     * @param sqlPrefix
     * @return List<OrderItem>
     */
    public static List<OrderItem> toOrderItem(List<OrderItem> orderItems, String sqlPrefix) {
        //OrderItem(column=updated_time, asc=false)
        return orderItems
                .stream()
                .map(item -> new OrderItem(sqlPrefix + "." + item.getColumn(), item.isAsc()))
                .collect(Collectors.toList());
    }

#代码Controller

public Result listPage(ProblemInfoQueryDto problemInfoQueryDto) {
    return Result.success("查询成功", problemInfoService.listPage(problemInfoQueryDto));
}

#service 

Map listPage(ProblemInfoQueryDto problemInfoQueryDto);

#serviceImpl 

public Map<String, Object> listPage(ProblemInfoQueryDto problemInfoDto) {
    IPage<ProblemInfoVo> page = new Page<>(problemInfoDto.getPage(), problemInfoDto.getSize());
    QueryWrapper<ProblemInfo> wrap = new QueryWrapper<>();
    wrap.orderByDesc("id");
    return PageUtil.toPage(mapper.listPage(page, wrap));
}
#mapper

Page<ProblemInfoVo> listPage(IPage<ProblemInfoVo> page,@Param(Constants.WRAPPER) QueryWrapper<ProblemInfo> wrap);

#xml

SELECT
   *
FROM
    tb_problem_info ${ew.customSqlSegment}