/*--用存儲過(guò)程實(shí)現的分頁(yè)程序

 顯示指定表、視圖、查詢(xún)結果的第X頁(yè)
 對于表中主鍵或標識列的情況,直接從原表取數查詢(xún)，其它情況使用臨時(shí)表的方法
 如果視圖或查詢(xún)結果中有主鍵,不推薦此方法

--*/

/*--調用示例
 exec p_show ‘地區資料‘

 exec p_show ‘地區資料‘,5,3,‘地區編號,地區名稱(chēng),助記碼‘,‘地區編號‘
--*/

if exists (select * from dbo.sysobjects where id = object_id(N‘[dbo].[p_show]‘) and OBJECTPROPERTY(id, N‘IsProcedure‘) = 1)
drop procedure [dbo].[p_show]
GO

CREATE Proc p_show
@QueryStr nvarchar(4000), --表名、視圖名、查詢(xún)語(yǔ)句
@PageSize int=10,   --每頁(yè)的大小(行數)
@PageCurrent int=1,   --要顯示的頁(yè)
@FdShow nvarchar (4000)=‘‘, --要顯示的字段列表,如果查詢(xún)結果有標識字段,需要指定此值,且不包含標識字段
@FdOrder nvarchar (1000)=‘‘ --排序字段列表
as
declare @FdName nvarchar(250) --表中的主鍵或表、臨時(shí)表中的標識列名
 ,@Id1 varchar(20),@Id2 varchar(20) --開(kāi)始和結束的記錄號
 ,@Obj_ID int    --對象ID
--表中有復合主鍵的處理
declare @strfd nvarchar(2000) --復合主鍵列表
 ,@strjoin nvarchar(4000) --連接字段
 ,@strwhere nvarchar(2000) --查詢(xún)條件

select @Obj_ID=object_id(@QueryStr)
 ,@FdShow=case isnull(@FdShow,‘‘) when ‘‘ then ‘ *‘ else ‘ ‘+@FdShow end
 ,@FdOrder=case isnull(@FdOrder,‘‘) when ‘‘ then ‘‘ else ‘ order by ‘+@FdOrder end
 ,@QueryStr=case when @Obj_ID is not null then ‘ ‘+@QueryStr else ‘ (‘+@QueryStr+‘) a‘ end

--如果顯示第一頁(yè)，可以直接用top來(lái)完成
if @PageCurrent=1 
begin
 select @Id1=cast(@PageSize as varchar(20))
 exec(‘select top ‘+@Id1+@FdShow+‘ from ‘+@QueryStr+@FdOrder)
 return
end

--如果是表,則檢查表中是否有標識更或主鍵
if @Obj_ID is not null and objectproperty(@Obj_ID,‘IsTable‘)=1
begin
 select @Id1=cast(@PageSize as varchar(20))
  ,@Id2=cast((@PageCurrent-1)*@PageSize as varchar(20))

 select @FdName=name from syscolumns where id=@Obj_ID and status=0x80
 if @@rowcount=0   --如果表中無(wú)標識列,則檢查表中是否有主鍵
 begin
  if not exists(select 1 from sysobjects where parent_obj=@Obj_ID and xtype=‘PK‘)
   goto lbusetemp  --如果表中無(wú)主鍵,則用臨時(shí)表處理

  select @FdName=name from syscolumns where id=@Obj_ID and colid in(
   select colid from sysindexkeys where @Obj_ID=id and indid in(
    select indid from sysindexes where @Obj_ID=id and name in(
     select name from sysobjects where xtype=‘PK‘ and parent_obj=@Obj_ID
   )))
  if @@rowcount>1  --檢查表中的主鍵是否為復合主鍵
  begin
   select @strfd=‘‘,@strjoin=‘‘,@strwhere=‘‘
   select @strfd=@strfd+‘,[‘+name+‘]‘
    ,@strjoin=@strjoin+‘ and a.[‘+name+‘]=b.[‘+name+‘]‘
    ,@strwhere=@strwhere+‘ and b.[‘+name+‘] is null‘
    from syscolumns where id=@Obj_ID and colid in(
    select colid from sysindexkeys where @Obj_ID=id and indid in(
     select indid from sysindexes where @Obj_ID=id and name in(
      select name from sysobjects where xtype=‘PK‘ and parent_obj=@Obj_ID
    )))
   select @strfd=substring(@strfd,2,2000)
    ,@strjoin=substring(@strjoin,5,4000)
    ,@strwhere=substring(@strwhere,5,4000)
   goto lbusepk
  end
 end
end
else
 goto lbusetemp

/*--使用標識列或主鍵為單一字段的處理方法--*/
lbuseidentity: 
 exec(‘select top ‘+@Id1+@FdShow+‘ from ‘+@QueryStr
  +‘ where ‘+@FdName+‘ not in(select top ‘
  +@Id2+‘ ‘+@FdName+‘ from ‘+@QueryStr+@FdOrder
  +‘)‘+@FdOrder
  )
 return

/*--表中有復合主鍵的處理方法--*/
lbusepk:  
 exec(‘select ‘+@FdShow+‘ from(select top ‘+@Id1+‘ a.* from
  (select top 100 percent * from ‘+@QueryStr+@FdOrder+‘) a
  left join (select top ‘+@Id2+‘ ‘+@strfd+‘
  from ‘+@QueryStr+@FdOrder+‘) b on ‘+@strjoin+‘
  where ‘+@strwhere+‘) a‘
  )
 return

/*--用臨時(shí)表處理的方法--*/
lbusetemp:  
select @FdName=‘[ID_‘+cast(newid() as varchar(40))+‘]‘
 ,@Id1=cast(@PageSize*(@PageCurrent-1) as varchar(20))
 ,@Id2=cast(@PageSize*@PageCurrent-1 as varchar(20))

exec(‘select ‘+@FdName+‘=identity(int,0,1),‘+@FdShow+‘
  into #tb from‘+@QueryStr+@FdOrder+‘
 select ‘+@FdShow+‘ from #tb where ‘+@FdName+‘ between ‘
 +@Id1+‘ and ‘+@Id2
 )

GO