修改后的SQL分页存储过程，利用2分法，支持排序

/****** Object:  StoredProcedure [dbo].[sys_Page_v3]    Script Date: 08/13/2014 09:32:28 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
 
--/*-----存储过程 分页处理 孙伟 2005-03-28创建 -------*/
--/*-----存储过程 分页处理 浪尘 2008-9-1修改----------*/
--/*----- 对数据进行了2分处理使查询前半部分数据与查询后半部分数据性能相同 -------*/ 
 
alter PROCEDURE [dbo].[sys_Page_v3]
(
@tblName nvarchar(200), ----要显示的表或多个表的连接
@fldName nvarchar(500) = *, ----要显示的字段列表
@pageSize int = 10, ----每页显示的记录个数
@page int = 1, ----要显示那一页的记录
@fldSort nvarchar(200) = null, ----排序字段列表或条件
@Sort bit = 0, ----排序方法，0为升序，1为降序(如果是多字段排列Sort指代最后一个排序字段的排列顺序(最后一个排序字段不加排序标记)--程序传参如： SortA Asc,SortB Desc,SortC )
@strCondition nvarchar(1000) = null, ----查询条件,不需where
@ID nvarchar(150), ----主表的主键
@Dist bit = 0, ----是否添加查询字段的 DISTINCT 默认0不添加/1添加
@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
)
AS
SET NOCOUNT ON
Declare @sqlTmp nvarchar(1000) ----存放动态生成的SQL语句
Declare @strTmp nvarchar(1000) ----存放取得查询结果总数的查询语句
Declare @strID nvarchar(1000) ----存放取得查询开头或结尾ID的查询语句 
 
Declare @strSortType nvarchar(10) ----数据排序规则A
Declare @strFSortType nvarchar(10) ----数据排序规则B 
 
Declare @SqlSelect nvarchar(50) ----对含有DISTINCT的查询进行SQL构造
Declare @SqlCounts nvarchar(50) ----对含有DISTINCT的总数查询进行SQL构造 
 
declare @timediff datetime --耗时测试时间差
select @timediff=getdate() 
 
if @Dist = 0
begin
set @SqlSelect = select
set @SqlCounts = Count(*)
end
else
begin
set @SqlSelect = select distinct
set @SqlCounts = Count(DISTINCT +@ID+)
end 
 
if @Sort=0
begin
set @strFSortType= ASC
set @strSortType= DESC
end
else
begin
set @strFSortType= DESC
set @strSortType= ASC
end 
 
--------生成查询语句--------
--此处@strTmp为取得查询结果数量的语句
if @strCondition is null or @strCondition= --没有设置显示条件
begin
set @sqlTmp = @fldName +  From  @tblName
set @strTmp = @SqlSelect+ @Counts=+@SqlCounts+ FROM +@tblName
set @strID =  From  @tblName
end
else
begin
set @sqlTmp = + @fldName +  From  @tblName +  where  @strCondition
set @strTmp = @SqlSelect+ @Counts=+@SqlCounts+ FROM +@tblName +  where 1=1  @strCondition
set @strID =  From  @tblName +  where  @strCondition
end 
 
----取得查询结果总数量-----
exec sp_executesql @strTmp,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 
 
set @pageIndex = @tmpCounts/@pageSize
set @lastcount = @tmpCounts%@pageSize
if @lastcount > 0
set @pageIndex = @pageIndex + 1
else
set @lastcount = @pagesize 
 
--//***显示分页
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
if @page=1
set @strTmp=@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ order by + @fldSort + + @strFSortType
else
begin
if @Sort=1
begin
set @strTmp=@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ <(select min(+ @ID +) from (+ @SqlSelect+ top + CAST(@pageSize*(@page-1) as Varchar(20)) + + @ID + from +@tblName
+ order by +  @ID + + @strFSortType+) AS TBMinID)
+ order by + @fldSort + + @strFSortType
end
else
begin
set @strTmp=@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ >(select max(+ @ID +) from (+ @SqlSelect+ top + CAST(@pageSize*(@page-1) as Varchar(20)) + + @ID + from +@tblName
+ order by +  @ID + + @strFSortType+) AS TBMinID)
+ order by + @fldSort + + @strFSortType
end
end
end
else
begin
set @page = @pageIndex-@page+1 --后半部分数据处理
if @page <= 1 --最后一页数据显示
set @strTmp=@SqlSelect+ * from (+@SqlSelect+ top + CAST(@lastcount as VARCHAR(6))+ + @fldName+ from +@tblName
+ order by + @fldSort + + @strSortType+) AS TempTB+ order by + @fldSort + + @strFSortType
else
if @Sort=1
begin
set @strTmp=@SqlSelect+ * from (+@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ >(select max(+ @ID +) from(+ @SqlSelect+ top + CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) + + @ID + from +@tblName
+ order by +  @ID + + @strSortType+) AS TBMaxID)
+ order by + @fldSort + + @strSortType+) AS TempTB+ order by + @fldSort + + @strFSortType
end
else
begin
set @strTmp=@SqlSelect+ * from (+@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ <(select min(+ @ID +) from(+ @SqlSelect+ top + CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) + + @ID + from +@tblName
+ order by +  @ID + + @strSortType+) AS TBMaxID)
+ order by + @fldSort + + @strSortType+) AS TempTB+ order by + @fldSort + + @strFSortType
end
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
if @page=1
set @strTmp=@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where 1=1  @strCondition +  order by + @fldSort + + @strFSortType
else if(@Sort=1)
begin
set @strTmp=@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ <(select min(+ @ID +) from (+ @SqlSelect+ top + CAST(@pageSize*(@page-1) as Varchar(20)) + + @ID + from +@tblName
+ where 1=1  @strCondition + order by +  @ID + + @strFSortType+) AS TBMinID)
+ + @strCondition + order by + @fldSort + + @strFSortType
end
else
begin
set @strTmp=@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ >(select max(+ @ID +) from (+ @SqlSelect+ top + CAST(@pageSize*(@page-1) as Varchar(20)) + + @ID + from +@tblName
+ where 1=1  @strCondition + order by +  @ID + + @strFSortType+) AS TBMinID)
+ + @strCondition + order by + @fldSort + + @strFSortType
end
end
else
begin
set @page = @pageIndex-@page+1 --后半部分数据处理
if @page <= 1 --最后一页数据显示
set @strTmp=@SqlSelect+ * from (+@SqlSelect+ top + CAST(@lastcount as VARCHAR(6))+ + @fldName+ from +@tblName
+ where 1=1 + @strCondition + order by + @fldSort + + @strSortType+) AS TempTB+ order by + @fldSort + + @strFSortType
else if(@Sort=1)
set @strTmp=@SqlSelect+ * from (+@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ >(select max(+ @ID +) from(+ @SqlSelect+ top + CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) + + @ID + from +@tblName
+ where 1=1 + @strCondition + order by +  @ID + + @strSortType+) AS TBMaxID)
+ + @strCondition+ order by + @fldSort + + @strSortType+) AS TempTB+ order by + @fldSort + + @strFSortType
else
set @strTmp=@SqlSelect+ * from (+@SqlSelect+ top + CAST(@pageSize as VARCHAR(6))+ + @fldName+ from +@tblName
+ where +@ID+ <(select min(+ @ID +) from(+ @SqlSelect+ top + CAST(@pageSize*(@page-2)+@lastcount as Varchar(20)) + + @ID + from +@tblName
+ where 1=1 + @strCondition + order by +  @ID + + @strSortType+) AS TBMaxID)
+ + @strCondition+ order by + @fldSort + + @strSortType+) AS TempTB+ order by + @fldSort + + @strFSortType
end
end 
 
------返回查询结果-----
exec sp_executesql @strTmp
--select datediff(ms,@timediff,getdate()) as 耗时
--print @strTmp
SET NOCOUNT OFF