分页查询

• MySql

     select tablename.*  from  tablename limit firstIndex,pageSize;

          firstIndex -------->开始索引

          pageSize--------->页大小

• Oracle

1.         select * from (

                           select a.*,ROWNUM rn from tablename a where ROWNUM<=(firstIndex+pageSize)

                          ) where rn>firstIndex;

 

     2.         select * from(select * from(select p.*,ROWNUM rn from tablename )p  where p.rownumber>firstIndex)  where rownum>pageSize;