高效分页sql存储过程

我这里有一个存储过程，很长很长啊。
--别看他很长，但是效率很高。5000万条数据亲测。
--不知道你用什么变成语言。这里就不不写调用方法了。
CREATE proc newgetpage
(--默认分页主键为id
 @tblName  nvarchar(128),  --表名称列表
 @PageSize  int=10,   --页尺寸
 @PageIndex   int=1,   --当前页
 @fields   nvarchar(4000)='*', --查询字段列表
 @fldname  nvarchar(50),  --主键字段名
 @fldorder  bit=1,   --主键排序方式，0asc，非零desc
 @FirstfldName  nvarchar(50)='',              --主排序字段名，非主键，有重复值
 @FirstfldOrder  bit=1,   --主字段排序方式
 @SecondfldName nvarchar(50)='',              --副排序字段名，非主键，有重复值
 @SecondfldOrder bit=1,   --副字段排序方式
 @strWhere  nvarchar(1000)='', --查询条件
 @Iscount  bit=0   --返回记录总数，非0则返回
)
as
declare @strsql   nvarchar(4000)  --主语句
declare @strtmp   nvarchar(500)  --临时变量
declare @strorder   nvarchar(500)  --总排序方式
declare @stropporder   nvarchar(500)  --总排序的反方式
declare @strorderfldlist  nvarchar(500)  --所有要排序的字段序列
declare @selectfld  nvarchar(500)  --选择主键page
declare @selectfirst  nvarchar(500)  --选择主排序page
declare @selectsecond  nvarchar(500)  --选择副排序page
/**/
declare @strwheretmp  nvarchar(500)  --临时where变量
if @strwhere!=''
 set @strwheretmp=' where '
else
 set @strwheretmp=''
/**/
set @strsql=''
set @strtmp=''
set @strorder=''
set @stropporder=''
set @strorderfldlist=''
set @selectfld=''
set @selectfirst=''
set @selectsecond=''
if @pagesize<1
 set @pagesize=10
if @pageindex<1
 set @pageindex=1
if @fields=''
 set @fields='*'
if @FirstfldName=''
 set @FirstfldName=''
if @SecondfldName=''
 set @SecondfldName=''


--------------------------------bengin
----------总排序方式
if @fldorder!=0
 begin
  -----正排序
  set @strorder=@fldname + ' desc '
  if @secondfldname!=''
   if @secondfldorder!=0
    set @strorder=@secondfldname + ' desc,'+@strorder
   else
    set @strorder=@secondfldname + ' asc,'+@strorder
  if @firstfldname!=''
   if @firstfldorder!=0
    set @strorder=@firstfldname + ' desc,'+@strorder
   else
    set @strorder=@firstfldname + ' asc,'+@strorder
  -----反排序
  set @stropporder=@fldname + ' asc '
  if @secondfldname!=''
   if @secondfldorder!=0
    set @stropporder=@secondfldname + ' asc,'+@stropporder
   else
    set @stropporder=@secondfldname + ' desc,'+@stropporder
  if @firstfldname!=''
   if @firstfldorder!=0
    set @stropporder=@firstfldname + ' asc,'+@stropporder
   else
    set @stropporder=@firstfldname + ' desc,'+@stropporder
 end
else
 begin
  -----正排序
  set @strorder=@fldname + ' asc '
  if @secondfldname!=''
   if @secondfldorder!=0
    set @strorder=@secondfldname + ' desc,'+@strorder
   else
    set @strorder=@secondfldname + ' asc,'+@strorder
  if @firstfldname!=''
   if @firstfldorder!=0
    set @strorder=@firstfldname + ' desc,'+@strorder
   else
    set @strorder=@firstfldname + ' asc,'+@strorder
  -----反排序
  set @stropporder=@fldname + ' desc '
  if @secondfldname!=''
   if @secondfldorder!=0
    set @stropporder=@secondfldname + ' desc,'+@stropporder
   else
    set @stropporder=@secondfldname + ' asc,'+@stropporder
  if @firstfldname!=''
   if @firstfldorder!=0
    set @stropporder=@firstfldname + ' desc,'+@stropporder
   else
    set @stropporder=@firstfldname + ' asc,'+@stropporder
 end
set @stropporder=' order by '+@stropporder
set @strorder=' order by '+@strorder +' '
---------总排序方式end
---------总排序字段序列
set @strorderfldlist='id'
if @firstfldname!=''
 begin
 set @strorderfldlist=@firstfldname+','+@strorderfldlist
 if @secondfldname!=''
  set @strorderfldlist=@secondfldname+','+@strorderfldlist
 end
---------总排序字段序列end
if @Firstfldname!=''
-------若主排序字段不空，则按主排序字段排序，
 begin  
  if @fldorder!=0   
       set @strTmp = '<=(select top 1'
  else
       set @strTmp = '>=(select top 1'
  set @selectfld=@fldname + replace(@strtmp,'=','')+'('+@fldname+')from(select top ' + str((@PageIndex-1)*@PageSize) 
   + ' '+@strorderfldlist +' from  '+@tblname+' '+@strwheretmp+@strwhere +@strorder
   +')as tbltmp '+ @stropporder +')'
  if @firstfldname!=''
   set @selectfirst=' and '+@firstfldname + @strtmp+'('+@firstfldname+')from(select top ' + str((@PageIndex-1)*@PageSize) 
    + ' '+@strorderfldlist +' from  '+@tblname+' '+@strwheretmp+@strwhere +@strorder
    +')as tbltmp '+ @stropporder +')'
  if @secondfldname!=''
   set @selectsecond=' and '+@secondfldname + @strtmp+'('+@secondfldname+')from(select top ' + str((@PageIndex-1)*@PageSize) 
    + ' '+@strorderfldlist +' from  '+@tblname+' '+@strwheretmp+@strwhere +@strorder
    +')as tbltmp '+ @stropporder +')'
  ------------多字段排序代码

  set @strSQL = 'select top ' + str(@PageSize) + ' '+@fields+' from '
      + @tblName + ' where ' + @selectfld + @selectfirst+ @selectsecond+ @strOrder
  
  if @strWhere != ''
      set @strSQL = 'select top ' + str(@PageSize) + ' '+@fields+' from '
          + @tblName + ' where ' + @selectfld + @selectfirst+ @selectsecond+' and ' + @strWhere + ' ' + @strOrder

  ------------多字段排序代码end
 end
-------若主排序字段不空，则按主排序字段排序，end
else
-------若主排序字段为空，则按主键排序，
 begin
  if charindex('.',@fldname)>0
   set @selectfld=substring(@fldname,charindex('.',@fldname)+1,len(@fldname))
  else
   set @selectfld=@fldname
  if @fldorder!=0   
   begin
       set @strTmp = '<(select top 1'
       set @strOrder = ' order by ' + @fldName +' desc'
       set @stropporder=' order by '+@selectfld +' asc'
   end
  else
   begin
       set @strTmp = '>(select top 1'
       set @strOrder = ' order by ' + @fldName +' asc'
       set @stropporder=' order by '+@selectfld +' desc '
   end
   
  set @strSQL = 'select top ' + str(@PageSize) + ' '+@fields+' from '
   + @tblName + ' where ' + @fldName + '' + @strTmp + '('
   + @selectfld + ') from (select top ' + str((@PageIndex-1)*@PageSize) + ' '
   + @fldName + ' from ' + @tblName + '' + @strOrder + ') as tblTmp '+@stropporder +')'
   + @strOrder
   
  if @strWhere != ''
   set @strSQL = 'select top ' + str(@PageSize) + ' '+@fields+' from '
           + @tblName + ' where ' + @fldName + '' + @strTmp + '('
           + @selectfld + ') from (select top ' + str((@PageIndex-1)*@PageSize) + ' '
           + @fldName + ' from ' + @tblName + ' where ' + @strWhere + ' '
           + @strOrder + ') as tblTmp '+@stropporder +') and ' + @strWhere + ' ' + @strOrder
 end
-------若主排序字段为空，则按主键排序，end
if @PageIndex = 1
begin
    set @strTmp = ''
    if @strWhere != ''
        set @strTmp = ' where ' + @strWhere

    set @strSQL = 'select top ' + str(@PageSize) + ' '+@fields+' from '
        + @tblName + '' + @strTmp + ' ' + @strOrder
end

if @IsCount != 0
begin
    set @strSQL = 'select count(*) as Total from ' + @tblName + ''
if @strWhere!=''
    set @strSQL='select count(*) as Total from '+@tblName +' where ' +@strWhere
end
--print @strsql
exec (@strSQL)
GO