/*–用存储过程实现的分页程序
显示指定表、视图、查询结果的第x页
对于表中主键或标识列的情况,直接从原表取数查询，其它情况使用临时表的方法
如果视图或查询结果中有主键,不推荐此方法
–邹建 2003.09–*/
/*–调用示例
exec p_show ‘地区资料’
exec p_show ‘地区资料’,5,3,’地区编号,地区名称,助记码’,’地区编号’
–*/
/*
因为要顾及通用性,所以对带排序的查询语句有一定要求.如果先排序,再出结果.就是:
exec p_show ‘select top 100 percent * from 地区资料 order by 地区名称’,5,3,’地区编号,地区名称,助记码’,’地区名称’
–查询语句加上:top 100 percent //top时
*/
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、视图名、查询语句
@pagesize int=10, –每页的大小(行数)
@pagecurrent int=1, –要显示的页
@fdshow nvarchar (4000)=”, –要显示的字段列表,如果查询结果有标识字段,需要指定此值,且不包含标识字段
@fdorder nvarchar (1000)=” –排序字段列表
as
declare @fdname nvarchar(250) –表中的主键或表、临时表中的标识列名
,@id1 varchar(20),@id2 varchar(20) –开始和结束的记录号
,@obj_id int –对象id
–表中有复合主键的处理
declare @strfd nvarchar(2000) –复合主键列表
,@strjoin nvarchar(4000) –连接字段
,@strwhere nvarchar(2000) –查询条件
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
–如果显示第一页，可以直接用top来完成
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,则检查表中是否有标识更或主键
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 –如果表中无标识列,则检查表中是否有主键
begin
if not exists(select 1 from sysobjects where parent_obj=@obj_id and xtype=’pk’)
goto lbusetemp –如果表中无主键,则用临时表处理
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 –检查表中的主键是否为复合主键
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
/*–使用标识列或主键为单一字段的处理方法–*/
lbuseidentity:
exec(‘select top ‘+@id1+@fdshow+’ from ‘+@querystr
+’ where ‘+@fdname+’ not in(select top ‘
+@id2+’ ‘+@fdname+’ from ‘+@querystr+@fdorder
+’)’+@fdorder
)
return
/*–表中有复合主键的处理方法–*/
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
/*–用临时表处理的方法–*/
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