SQL Server 2005通用分页存储过程及多表联接应用

这是不久前写的一个分页存储过程，可应用于sql server 2005上面：

if object_id('[proc_selectforpager]') is not null
drop procedure [proc_selectforpager]
go
create proc proc_selectforpager
(
@sql varchar(max) ,
@order varchar(4000) ,
@currentpage int ,
@pagesize int,
@totalcount int output
)
as
/*andy 2012-2-28 */
declare @exec_sql nvarchar(max)
set @exec_sql='set @totalcount=(select count(1) from ('+@sql+') as a)'
exec sp_executesql @exec_sql,n'@totalcount int output',@totalcount output
set @order=isnull(' order by '+nullif(@order,''),' order by getdate()')
if @currentpage=1 /*经常会调用第1页，这里做特殊处理，少一层子查询*/
set @exec_sql='
;with cte_exec as
(
'+@sql+'
)
select top(@pagesize) *,row_number() over('+@order+') as r from cte_exec order by r
'
else
set @exec_sql='
;with cte_exec as
(
select *,row_number() over('+@order+') as r from ('+@sql+') as a
)
select * from cte_exec where r between (@currentpage-1)*@pagesize+1 and @currentpage*@pagesize order by r
'
exec sp_executesql @exec_sql,n'@currentpage int,@pagesize int',@currentpage,@pagesize
go

调用方法：
1.单表：

exec proc_selectforpager @sql = 'select * from contacts a where a.contacttype=1', -- varchar(max)
@order = '', -- varchar(4000)
@currentpage = 3, -- int
@pagesize = 20, -- int
@totalcount = 0 -- int

2.多表联接：

exec proc_selectforpager @sql =
'select a.staff,a.ou,b.fname+b.fname as name
from staffouhist a
inner join staff b on b.id=a.staff and a.expirydate=''30001231''
', -- varchar(max)
@order = '', -- varchar(4000)
@currentpage = 3, -- int
@pagesize = 20, -- int
@totalcount = 0 -- int

注：在@sql 中不能使用cte。