最效率分页查询

USE [tablename]
GO
/****** Object:  StoredProcedure [dbo].[paginate]    Script Date: 05/12/2013 17:35:10 ******/
SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:      <Jeremy Menethil>
-- Create date: <2013-04-03>
-- Description: <Best Paginate>
-- =============================================
ALTER PROCEDURE [dbo].[paginate]
    -- Add the parameters for the stored procedure here
@tbName nvarchar(100),
@items nvarchar(500),
@where nvarchar(100),
@orderBy nvarchar(100),
@orderType int,
@pageSize int,
@pageCurrent int=1 output,
@pageCount int output,
@recordCount int output
AS
declare @strSql nvarchar(1000)
declare @strOrderType nvarchar(50)
declare @indexA int
declare @indexB int
declare @ab int
declare @str nvarchar(100)
BEGIN
 
    -- SET NOCOUNT ON added to prevent extra result sets from
    -- interfering with SELECT statements.
    SET NOCOUNT ON;
     
    --------Set pageSize
    if @pageSize<1
    Begin
        set @pageSize=1
    END
    ------------------------------
    --------Set pageCureent
    if @pageCurrent<1
    Begin
        set @pageCurrent=1
    END
 
    if @pageCurrent>@pageCount
    Begin
        set @pageCurrent=@pageCount
    End
    ------------------------------
     
    --------Set ordertype  
    if @orderType=1
    Begin
        set @strOrderType=' asc'
    End
    else
    Begin
        set @strOrderType=' desc'
    End
    ------------------------------
 
    --------Set Where
    if @where!=''
    Begin
        set @where=' where '+@where
    End
 
    set @str='select @recordCount=COUNT(*) from '+@tbName+@where
    exec sp_executesql @str,N'@recordCount int output,@tbName nvarchar(100)',@recordCount output,@tbName
 
 
    --------Set pageCount
    set @pageCount=@recordCount/@pageSize
    if @recordCount%@pageSize>0
    begin
        set @pageCount=@pageCount+1
    end
    ------------------------------
 
 
    --------Execute Sql
    set @indexA=(@pageCurrent-1)*@pageSize
    set @indexB=@pageCurrent*@pageSize
    set @strSql='select '+@items+' from (select ROW_NUMBER() over(order by '+@orderBy+@strOrderType+') as '
        +'rowNum,* from '+@tbName+@where+') as tbTmp where rowNum >'
        +str(@indexA)+' and rowNum <='+str(@indexB)
    -- Insert statements for procedure here
    exec(@strSql)
 
END