使用T-SQL生成树形目录(引用)

使用T-SQL生成树形目录(引用) 收藏
--创建测试数据表.
create table tb(id int,name varchar(10),parentid int)
insert tb select 1,'aaaa' ,0
union all select 2,'bbbb' ,0
union all select 3,'cccc' ,0
union all select 4,'aaaa-1' ,1
union all select 5,'aaaa-2' ,1
union all select 6,'bbbb-1' ,2
union all select 7,'cccc-1' ,3
union all select 8,'cccc-2' ,3
union all select 9,'aaaa-1-1',4
union all select 10,'cccc-2-1',8
union all select 11,'cccc-2-2',8
union all select 12,'aaaa-1-2',4
go

--创建表值函数(对原函数做了修改，增加了前缀)
alter function dbo. f_id()
returns @re table(id int,parentid int,level int,sid varchar(8000),pre1 varchar(2),pre2 varchar(2))
as
begin
declare @l int
set @l=0
insert @re select id,parentid,@l,right(10000+id,4),'',''
from tb where parentid=0
while @@rowcount>0
begin
set @l=@l+1
insert @re select a.id,a.parentid,@l,b.sid+','+right(10000+a.id,4),'',''
from tb a,@re b
where a.parentid=b.id and b.level=@l-1
end
update a set pre2=
case
when a.level>1 then case id when (select convert(int,right(max(sid),4)) from @re where parentid=a.parentid and level=a.level) then '└' else '├' end
else case id when (select convert(int,right(max(sid),4)) from @re where level=a.level) then '└' else '├' end
END from @re a where a.level>0
update a set pre1=
CASE
when parentid=(select convert(int,right(max(sid),4)) from @re where level=a.level-1) then '' else '│'
END from @re a where a.level>1
RETURN
END

--返回结果集.
select [带缩进的name]=case when b.[level]=0 then a.name
when b.[level]=1 then pre2+replicate('-',4)+a.name
else b.pre1+replicate('',(b.level-1)*4)+b.pre2+replicate('-',4)+a.name
end,a.name,a.id
from tb a,f_id() b where a.id=b.id order by b.sid

/**//*结果:
带缩进的name name id
-------------------- ---------- -----------
aaaa aaaa 1
├----aaaa-1 aaaa-1 4
│├----aaaa-1-1 aaaa-1-1 9
│└----aaaa-1-2 aaaa-1-2 12
├----aaaa-2 aaaa-2 5
bbbb bbbb 2
├----bbbb-1 bbbb-1 6
cccc cccc 3
├----cccc-1 cccc-1 7
└----cccc-2 cccc-2 8
├----cccc-2-1 cccc-2-1 10
└----cccc-2-2 cccc-2-2 11
*/
引用资源:http://topic.csdn.net/t/20040904/18/3340610.html
http://www.cnblogs.com/drc/archive/2005/11/04/269062.html

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