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  • MSSQL 查找子結節與父節點

    -->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 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
     
    */
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  • 原文地址:https://www.cnblogs.com/liushunli/p/5293801.html
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