java仿百度假分页代码实现的详解

1 ,service 层代码实现

 integer start = (pagenum - 1) * pagesize;
    integer end = pagesize;
    list<entity> entitylist;
    
    //调用mapper查询数据库
    entitylist = entitypomapper.query(start, end);

    simplepageinfo simplepageinfo = simplepageinfo.of(entitylist );
    simplepageinfo.setnumber(pagenum);
    simplepageinfo.setpagesize(pagesize);

// 查询出来数据等于size,总数据量加一，页数加一
    if (entitylist .size() == pagesize) {
      integer totalelements = (pagenum * pagesize) + 1;
      integer pages = pagenum + 1;
      simplepageinfo.settotalelements(totalelements);
      simplepageinfo.setpages(pages);
    } else {
    //数据不够size
      integer totalelements = ((pagenum - 1) * pagesize + entitylist .size());
      integer pages = pagenum;
      simplepageinfo.settotalelements(totalelements);
      simplepageinfo.setpages(pages);
    }
    return simplepageinfo;
}

2,mapper

<select .............>
    select..
    from ...
    where ...
    limit #{start}, #{end}
  </select>

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