[转载]通用存储过程分页(使用ROW_NUMBER()和不使用ROW_NUMBER()两种情况)性能分析

Declare @SQL nvarchar(4000)
Declare @SQLtemp nvarchar(1000)
set @sql=‘ From ‘+@tblName
if(@strWhere!=”) set @sql=@sql+‘ Where ‘+@strWhere

declare @strCount nvarchar(1000)
—总记录条数
if(@doCount!=0)
begin
if(@strWhere !=”)
begin
set @strCount=‘set @num=(select count(1) from ‘+ @tblName + ‘ where ‘+@strWhere+‘ )‘
end
else
begin
set @strCount=‘set @num=(select count(1) from ‘+ @tblName + ‘ )‘
end
EXECUTE sp_executesql @strCount ,N‘@num INT output‘,@RecordCount output
end

if @strWhere !=”
begin
set @strWhere=‘ where ‘+@strWhere
end

if (@PageIndex>1)
begin
set @sqltemp=@PKName+‘ not in (Select Top ‘+cast((@PageSize*(@PageIndex–1)) as nvarchar)+‘ ‘+@PKName+‘ ‘+@sql
if(@strOrder!=”)set @sqltemp=@sqltemp+‘ ‘+@strOrder
set @sqltemp=@sqltemp+‘)‘
set @sql=‘Select Top ‘+cast(@PageSize as nvarchar)+‘ ‘+@strGetFields+‘ ‘+@sql
if(@strWhere!=”)set @sql=@sql+‘ And ‘+@sqltemp
else set @sql=@sql+‘ Where ‘+@sqltemp
end
else
begin
set @sql=‘Select Top ‘+cast(@PageSize as nvarchar)+‘ ‘+@strGetFields+‘ ‘+@sql
end
if(@strOrder!=”) set @sql=@sql+‘ ‘+@strOrder
exec(@sql)

— =============================================
— Author:        <jiangrod>
— Create date: <2010-03-03>
— Description:    <SQL2005 及后续版本通用分页存储过程>调用方 法: sp_Pager2005 ‘xtest’,’*’,’ORDER BY ID ASC’,’xname like ”%222name%”’,2,20,0,0
— =============================================
ALTER PROCEDURE [dbo].[sp_Pager2005]
@tblName varchar(255), — 表名 如：’xtest’
@strGetFields varchar(1000) = ‘*‘, — 需要返回的列如：’xname,xdemo’
@strOrder varchar(255)=”, — 排序的字 段名如：’order by id desc’
@strWhere varchar(1500) = ”, — 查询条件(注意:不要加 where)如:’xname like ”%222name%”’
@pageIndex int = 1, — 页码如：2
@pageSize int = 20, — 每页记录 数如：20
@recordCount int output, — 记录总数
@doCount bit=0 — 非0则统计,为0则不统计(统计会影响效率)
AS

declare @strSQL varchar(5000)
declare @strCount nvarchar(1000)
—总记录条数
if(@doCount!=0)
begin
if(@strWhere !=”)
begin
set @strCount=‘set @num=(select count(1) from ‘+ @tblName + ‘ where ‘+@strWhere+‘ )‘
end
else
begin
set @strCount=‘set @num=(select count(1) from ‘+ @tblName + ‘ )‘
end
EXECUTE sp_executesql @strCount ,N‘@num INT output‘,@RecordCount output
end

if @strWhere !=”
begin
set @strWhere=‘ where ‘+@strWhere
end
set @strSQL=‘SELECT * FROM (SELECT ROW_NUMBER() OVER (‘+@strOrder+‘) AS ROWID,‘
set @strSQL=@strSQL+@strGetFields+‘ FROM [‘+@tblName+‘] ‘+@strWhere
set @strSQL=@strSQL+‘) AS sp WHERE ROWID BETWEEN ‘+str((@PageIndex–1)*@PageSize+1)
set @strSQL=@strSQL+‘ AND ‘+str(@PageIndex*@PageSize)
exec (@strSQL)