här är en icke-rekursiv lösning som du kan anpassa för din modell (http://pastie.org/1259300)
drop table if exists product;
create table product
(
prod_id smallint unsigned not null auto_increment primary key,
name varchar(255) not null,
parent_id smallint unsigned null,
key (parent_id)
)engine = innodb;
insert into product (name, parent_id) values
('Products',null),
('Systems & Bundles',1),
('Components',1),
('Processors',3),
('Motherboards',3),
('AMD',5),
('Intel',5),
('Intel LGA1366',7);
delimiter ;
drop procedure if exists product_hier;
delimiter #
create procedure product_hier
(
in p_prod_id smallint unsigned
)
begin
declare v_done tinyint unsigned default 0;
declare v_depth smallint unsigned default 0;
create temporary table hier(
parent_id smallint unsigned,
prod_id smallint unsigned,
depth smallint unsigned default 0
)engine = memory;
insert into hier select parent_id, prod_id, v_depth from product where prod_id = p_prod_id;
/* http://dev.mysql.com/doc/refman/5.0/en/temporary-table-problems.html */
create temporary table tmp engine=memory select * from hier;
while not v_done do
if exists( select 1 from product p inner join hier on p.parent_id = hier.prod_id and hier.depth = v_depth) then
insert into hier
select p.parent_id, p.prod_id, v_depth + 1 from product p
inner join tmp on p.parent_id = tmp.prod_id and tmp.depth = v_depth;
set v_depth = v_depth + 1;
truncate table tmp;
insert into tmp select * from hier where depth = v_depth;
else
set v_done = 1;
end if;
end while;
select
p.prod_id,
p.name as prod_name,
b.prod_id as parent_prod_id,
b.name as parent_prod_name,
hier.depth
from
hier
inner join product p on hier.prod_id = p.prod_id
inner join product b on hier.parent_id = b.prod_id
order by
hier.depth, hier.prod_id;
drop temporary table if exists hier;
drop temporary table if exists tmp;
end #
delimiter ;
call product_hier(3);
call product_hier(5);