SQL 2005的ROW_NUMBER()实现分页功能

DECLARE @pagenum AS INT, @pagesize AS INT
SET @pagenum = 2
SET @pagesize = 3
SELECT *
FROM (SELECT ROW_NUMBER() OVER(ORDER BY newsid DESC) AS rownum, 
        newsid, topic, ntime, hits
      FROM news) AS D
WHERE rownum BETWEEN (@pagenum-1)*@pagesize+1 AND @pagenum*@pagesize
ORDER BY newsid DESC

ALTER PROCEDURE news_Showlist
(
@tblName   varchar(255),       -- 表名
@strGetFields varchar(1000),  -- 需要返回的列
@fldName varchar(255),      -- 排序的字段名
@PageSize   int ,          -- 页尺寸
@PageIndex  int ,           -- 页码
@strWhere  varchar(1500),  -- 查询条件(注意: 不要加where)
@Sort varchar(255)      --排序的方法

)
AS
declare @strSQL   varchar(5000)       -- 主语句
declare @strTmp   varchar(110)        -- 临时变量
declare @strOrder varchar(400)        -- 排序类型

if @Sort = 'desc'
begin
set @strTmp = '<(select min'
set @strOrder = ' order by ' + @fldName +' desc'
--如果@OrderType不是，就执行降序，这句很重要！
end
else
begin
set @strTmp = '>(select max'
set @strOrder = ' order by ' + @fldName +' asc'
end
 
if @PageIndex = 1
begin
if @strWhere != ''   
  begin
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ '  from ' + @tblName 
+ ' where ' + @strWhere + ' ' + @strOrder
  end
else
  begin
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ '  from '+ @tblName 
+ ' '+ @strOrder
  end
--如果是第一页就执行以上代码，这样会加快执行速度
end
else
begin
--以下代码赋予了@strSQL以真正执行的SQL代码
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ '  from '
+ @tblName + ' where ' + @fldName + '' + @strTmp + '('+ @fldName + ') from 
(select top ' + str((@PageIndex-1)*@PageSize) + ' '+ @fldName + ' from ' 
+ @tblName + '' + @strOrder + ') as tblTmp)'+ @strOrder
 
if @strWhere != ''
set @strSQL = 'select top ' + str(@PageSize) +' '+@strGetFields+ '  from '
+ @tblName + ' where ' + @fldName + '' + @strTmp + '('+ @fldName + ') from 
(select top ' + str((@PageIndex-1)*@PageSize) + ' '+ @fldName + ' from '
 + @tblName + ' where ' + @strWhere + ' '+ @strOrder + ') as tblTmp) 
and ' + @strWhere + ' ' + @strOrder
end
exec (@strSQL)
RETURN