MSSQL查找指定節點下的子結點

-->Title:Generating test data
-->Author:wufeng4552
-->Date :2012-09-30 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 来自: http://www.52mvc.com
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
*/