新闻分类表结构,是个三级分类结构(程序没做成无限的),顶级分类的ParentCategoryId是0
CategoryId CategoryName ParentCategoryId新闻表结构,其中Category1 2 3是int型,表示三级分类
NewsId Category1 Category2 Category3 Title Content。需求是统计每个分类的新闻数量,显示一个表,类似下面结构。
CategoryId CategoryName ParentCategoryId NewsCount
CategoryId CategoryName ParentCategoryId新闻表结构,其中Category1 2 3是int型,表示三级分类
NewsId Category1 Category2 Category3 Title Content。需求是统计每个分类的新闻数量,显示一个表,类似下面结构。
CategoryId CategoryName ParentCategoryId NewsCount
-->Author:wufeng4552
-->Date :2009-09-30 08:52:38
set nocount on
if object_id('tb','U')is not null drop table tb
go
create table tb(ID int, ParentID int)
insert into tb select 1,0
insert into tb select 2,1
insert into tb select 3,1
insert into tb select 4,2
insert into tb select 5,3
insert into tb select 6,5
insert into tb select 7,6
-->Title:查找指定節點下的子結點
if object_id('Uf_GetChildID')is not null drop function Uf_GetChildID
go
create function Uf_GetChildID(@ParentID int)
returns @t table(ID int)
as
begin
insert @t select ID from tb where ParentID=@ParentID
while @@rowcount<>0
begin
insert @t select a.ID from tb a inner join @t b
on a.ParentID=b.id and
not exists(select 1 from @t where id=a.id)
end
return
end
go
select * from dbo.Uf_GetChildID(5)
/*
ID
-----------
6
7
*/
-->Title:查找指定節點的所有父結點
if object_id('Uf_GetParentID')is not null drop function Uf_GetParentID
go
create function Uf_GetParentID(@ID int)
returns @t table(ParentID int)
as
begin
insert @t select ParentID from tb where ID=@ID
while @@rowcount!=0
begin
insert @t select a.ParentID from tb a inner join @t b
on a.id=b.ParentID and
not exists(select 1 from @t where ParentID=a.ParentID)
end
return
end
go
select * from dbo.Uf_GetParentID(2)
/*
ParentID
-----------
1
0
*/本文来自CSDN博客,转载请标明出处:http://blog.csdn.net/wufeng4552/archive/2009/09/30/4619995.aspx