MSSQL 查找子結節與父節點

Posted 2020-06-25 刘顺利

-->Title:Generating test data

 

-->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 [email protected]

 

   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 [email protected]

 

   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

 

*/