/*–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
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