--bom結構，查詢節點下所有子節點：
create table os(id int,parentid int,desn varchar(10))
insert into os select 1,0,'體育用品'
insert into os select 2,0,'戶外運動'
insert into os select 3,1,'籃球'
insert into os select 4,1,'足球'
insert into os select 5,2,'帳篷'
insert into os select 6,2,'登山鞋'
insert into os select 7,0,'男士用品'
insert into os select 8,7,'刮鬍刀'
insert into os select 9,3,'大號籃球'
--求個節點下所有子節點：
create function f_cid(@id int)
returns varchar(500)
asbegin
declare @t table(id int,parentid int,desn varchar(10),lev int)
declare @lev int
set @lev=1
insert into @t select *,@lev from os where id=@id
while(@@rowcount>0)
begin
set @lev=@lev+1
insert into @t select a.*,@lev from os a,@t b
where a.parentid=b.id and b.lev=@lev-1
enddeclare @cids varchar(500)
select @cids=isnull(@cids+',','')+ltrim(id) from @t order by lev
return @cids
endgo
--呼叫函式
select *,ids=dbo.f_cid(id) from os
--得到每個節點路徑：
create proc wsp2
@id int
asselect *,cast(' ' as varchar(10)) fullpath into #os from os
declare @i int,@j int
set @i=0
set @j=1
select @i=max(parentid) from #os
update #os set fullpath=id
while @j<=@i
begin
update #os set fullpath=a.fullpath+','+ltrim(#os.id)
from #os inner join #os a on #os.parentid=a.id
where #os.parentid=@j
set @j=@j+1
endselect * from #os
go--呼叫儲存過程
exec wsp2 1
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