SET ANSI_NULLS ON
GO
SET QUOTED_IDENTIFIER ON
GO
-- =============================================
-- Author:    瀟瀟與偕
-- Create date: 
-- Description:    分頁儲存過程
-- =============================================
create PROCEDURE p_Common_DataPager_New
@sqlstr nvarchar(max), --SQL statement 
@currentpage
 
 int,    --page #
@pagesize int,      --size of page
@rowcount int output,
@pagecount int output

AS
BEGIN
    set nocount on 
    declare @countSql nvarchar(max)
    declare @dataSql nvarchar(max)
    declare @dbwhitespaceIndex int=0
    declare @orderbyStr nvarchar(max)
    
    
    
    --處理掉多餘空格
 

    set @dbwhitespaceIndex=CHARINDEX('  ',@sqlStr)
    while @dbwhitespaceIndex>0
    begin
     set @sqlStr=REPLACE(@sqlStr,'  ',' ')
     set @dbwhitespaceIndex=CHARINDEX('  ',@sqlStr)
    end

    

    print ('@orderbyStr:'+@orderbyStr)
    --組裝無排序欄位的查詢sql
    if CHARINDEX('ORDER BY',@sqlStr)=
 
0
        begin
            --擷取排序欄位
            set @orderbyStr=''
            set @dataSql='declare @tempTable table 
                (
                  TemplTableSortId int
                );
                select top '+CONVERT(nvarchar(10),@pagesize)+' dt.* from (
                select ROW_NUMBER() over(order by t.TemplTableSortId) sortid,s.* from ('+@sqlstr+') s
                left join @tempTable t on 0=1) dt
                where dt.sortid> '+convert(nvarchar(10),(@currentpage-1)*@pagesize)
        end
    --組裝有排序欄位的sql
    else
    begin
         select @orderbyStr= SUBSTRING(@sqlStr,CHARINDEX('ORDER BY',@sqlStr),LEN(@sqlStr))
         set @dataSql='select top '+CONVERT(nvarchar(10),@pagesize)+' dt.* from 
                             ( select ROW_NUMBER() over('+@orderbyStr+') sortid,'+ SUBSTRING(@sqlStr,CHARINDEX('SELECT',@sqlStr)+6,LEN(@sqlStr)-len(@orderbyStr)-6)+') dt where dt.sortid>'+convert(nvarchar(10),(@currentpage-1)*@pagesize)
    end

    --查詢總行數
    set @countSql='select @totalcount=count(*)  from ('+ SUBSTRING(@sqlStr,0,LEN(@sqlStr)-len(@orderbyStr))+') t'

    exec sp_executesql @countSql, N'@totalcount int out',@rowcount out

    --計算總頁數
    set @pagecount=@rowcount/@pagesize

    if @rowcount%@pagesize>0
    begin
      set @pagecount+=1
    end
    
    exec(@dataSql)
    
    set nocount off 
END
GO