收到客户端{pageNo:1,pagesize:10} 
select * from table limit (pageNo-1) * pageSize, pageSize;

收到客户端{pageNo:5,pageSize:30} 

select * from table limit (pageNo-1) * pageSize,pageSize;

假设主键或者唯一索引为 good_id 
收到客户端{pageNo:5,pagesize:10} 
select * from table where good_id > (pageNo-1) * pageSize limit pageSize; 
–返回good_id为40到50之间的数据

select * from table where good_id > (pageNo-1)*pageSize order by good_id limit pageSize; 
–返回good_id为40到50之间的数据,数据依据good_id顺序排列

每页显示10条：
当前 118 120， 125

倒序：
      大   小
      980  970 7 6 6 5 54 43 32

21 19 98   
下一页：

  select 
    * 
  from 
    tb1 
  where 
    nid < (select nid from (select nid from tb1 where nid < 当前页最小值 order by nid desc limit 每页数据 *【页码-当前页】) A order by A.nid asc limit 1) 
  order by 
    nid desc 
  limit 10;



  select 
    * 
  from 
    tb1 
  where 
    nid < (select nid from (select nid from tb1 where nid < 970 order by nid desc limit 40) A order by A.nid asc limit 1) 
  order by 
    nid desc 
  limit 10;


上一页：

  select 
    * 
  from 
    tb1 
  where 
    nid < (select nid from (select nid from tb1 where nid > 当前页最大值 order by nid asc limit 每页数据 *【当前页-页码】) A order by A.nid asc limit 1) 
  order by 
    nid desc 
  limit 10;


  select 
    * 
  from 
    tb1 
  where 
    nid < (select nid from (select nid from tb1 where nid > 980 order by nid asc limit 20) A order by A.nid desc limit 1) 
  order by 
    nid desc 
  limit 10;