mysql 遞迴排序查詢
備註：producttype 排序表，producttype。ptype父節點 ，producttype 。id 主鍵，showtreenodes (in rootid int) 函式，引數為起始型別rootid.
//我的部落格
drop procedure if exists showtreenodes;
create procedure showtreenodes (in rootid int)
begin
declare level int ;
drop table if exists tmplst;
create table tmplst (
id int,
nlevel int,
scort varchar(8000)
);set level=0 ;
insert into tmplst select id,level,id from producttype where ptype=rootid;
while row_count()>0 do
set level=level+1 ;
insert into tmplst
select a.id,level,concat(b.scort,a.id) from producttype a,tmplst b
where a.ptype=b.id and b.nlevel=level-1 ;
end while;
end;
//我的部落格
call showtreenodes(-1);
//我的部落格
select concat(space(b.nlevel*2),'┕',a.name)
from producttype a,tmplst b
where a.id=b.id
order by b.scort;
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