扩展Row_Number分页功能，二分思路。

近期遇到了数据量比较大的多列排序处理，Top Max模式很难满足多列混合排序的情形，Row_number则可以，但是在末尾的分页效果已经不太如人意了，想了想二分法改造一下比较适合吧。

本存储过程适合多列排序，通用，效率不如单纯的Top Max二分法，但是要配合多列排序，还是能够接受。

if exists(select name from sysobjects where type='p'and name='DataPager')
drop PROCEDURE DataPager
go

Create PROCEDURE [DataPagerTmp]
(
@tblName nvarchar(200),         ----要显示的表或多个表的连接
@fldName nvarchar(1000)='*',    ----要显示的字段列表，一定要包含排序字段
@pageSize int = 10,             ----每页显示的记录个数
@page   int = 1,                ----要显示那一页的记录
@pageCount int  = 1 output,     ----查询结果分页后的总页数
@Counts int =1 output,          ----查询到的记录数
@fldSort    nvarchar(100)='',   ----如果多列排序,最后一列不能带DESC或ASC,@Sort排序作用于最后一列，反之,单列根据@Sort来处理
@Sort   int = 1,                ----排序方法，0为升序，1为降序
@strCondition   nvarchar(1000)='',  ----查询条件,不需where
@keyID nvarchar(50) = 'ID'
)
/*Create by wszhoho*/
AS
declare @sqlTmp nvarchar(2000)
declare @sqlGetCount nvarchar(2000)
declare @frontOrder nvarchar(200)
declare @behindOrder nvarchar(200)
declare @start nvarchar(20)
declare @end nvarchar(20)
begin
if @fldSort is null or @fldSort=''
set @fldSort=@keyID

if charindex(',',@fldSort,0)>0--多列排序,则@Sort排序方法无效
begin
if @Sort=1--倒序
set @fldSort = @fldSort + ' Desc'
else
set @fldSort = @fldSort + ' ASC'
set @frontOrder = @fldSort--获取分页前半部分数据的排序规则
set @behindOrder = replace(@frontOrder,'desc','desctmp')
set @behindOrder = replace(@behindOrder,'asc','desc')
set @behindOrder = replace(@behindOrder,'desctmp','asc')--获取分页后半部分数据的排序规则
end
else--单列
begin
set @fldSort=replace(replace(@fldSort,'desc',''),'asc','')--替换掉结尾的规则,用@Sort值来处理排序
if @Sort=1--倒序
begin
set @frontOrder = @fldSort + ' desc'
set @behindOrder = @fldSort + ' asc'
end
else
begin
set @frontOrder = @fldSort + ' asc'
set @behindOrder = @fldSort + ' desc'
end
end

--获取记录数
if @strCondition is null or @strCondition = ''--无条件
begin
set @sqlGetCount = 'select @Counts=count(*) from ' + @tblName
end
else
begin
set @sqlGetCount = 'select @Counts=count(*) from ' + @tblName + ' where ' + @strCondition
end

----取得查询结果总数量-----
exec sp_executesql @sqlGetCount,N'@Counts int out ',@Counts out
declare @tmpCounts int
if @Counts = 0
set @tmpCounts = 1
else
set @tmpCounts = @Counts

--取得分页总数
set @pageCount=(@tmpCounts+@pageSize-1)/@pageSize

/**当前页大于总页数 取最后一页**/
if @page>@pageCount
set @page=@pageCount
/*-----数据分页2分处理-------*/
declare @pageIndex int --总数/页大小
declare @lastcount int --总数%页大小 最后一页的数据量

set @pageIndex = @tmpCounts/@pageSize
set @lastcount = @tmpCounts%@pageSize
if @lastcount > 0
set @pageIndex = @pageIndex + 1
else
set @lastcount = @pagesize

--取得数据的逻辑分析
if @strCondition is null or @strCondition=''     --没有设置显示条件
begin
if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理
begin
--计算开始结束的行号
set @start = @pageSize*(@page-1)+1
set @end =  @start+@pageSize-1
set @sqlTmp='SELECT ' + @fldName + ' FROM (select '+@fldName+',ROW_NUMBER() OVER ( Order by '+@frontOrder+' ) AS RowNumber From '+@tblName+') T WHERE T.RowNumber BETWEEN '+@start+' AND '+@end+' order by '+@frontOrder
end
else
begin
set @page = @pageIndex-@page+1 --后半部分数据处理
if @lastcount=@pageSize --如果正好是整数页
begin
set @start = @pageSize*(@page-1)+1
set @end =  @start+@pageSize-1
end
else
begin
set @start = @lastcount+@pageSize*(@page-2)+1
set @end =  @start+@pageSize-1
end
set @sqlTmp='select '+@fldName+' FROM (select '+@fldName+',ROW_NUMBER() OVER ( Order by '+@behindOrder+' ) AS RowNumber From '+@tblName+') T WHERE T.RowNumber BETWEEN '+@start+' AND '+@end+' order by '+@frontOrder
end
end
else --有查询条件
begin
if @pageIndex<2 or @page<=@pageIndex / 2 + @pageIndex % 2   --前半部分数据处理
begin
--计算开始结束的行号
set @start = @pageSize*(@page-1)+1
set @end =  @start+@pageSize-1
set @sqlTmp='SELECT ' + @fldName + ' FROM (select '+@fldName+',ROW_NUMBER() OVER ( Order by '+@frontOrder+' ) AS RowNumber From '+@tblName+' where '+@strCondition+') T WHERE T.RowNumber BETWEEN '+@start+' AND '+@end+' order by '+@frontOrder
end
else
begin
set @page = @pageIndex-@page+1 --后半部分数据处理
if @lastcount=@pageSize --如果正好是整数页
begin
set @start = @pageSize*(@page-1)+1
set @end =  @start+@pageSize-1
end
else
begin
set @start = @lastcount+@pageSize*(@page-2)+1
set @end =  @start+@pageSize-1
end
set @sqlTmp='select '+@fldName+' FROM (select '+@fldName+',ROW_NUMBER() OVER ( Order by '+@behindOrder+' ) AS RowNumber From '+@tblName+' where '+@strCondition+') T WHERE T.RowNumber BETWEEN '+@start+' AND '+@end+' order by '+@frontOrder
end
end
end
exec sp_executesql @sqlTmp
--select @sqlTmp

相关测试效果依数据量和索引合理性而定。