これは、ストアド プロシージャを使用して次のように行うことができます。
呼び出しの例
mysql> call names_hier(1, 'a');
+----+----------+--------+-------------+-------+
| id | emp_name | parent | parent_name | depth |
+----+----------+--------+-------------+-------+
| 2 | ali | 1 | f00 | 1 |
| 8 | anna | 6 | keira | 4 |
+----+----------+--------+-------------+-------+
2 rows in set (0.00 sec)
mysql> call names_hier(3, 'k');
+----+----------+--------+-------------+-------+
| id | emp_name | parent | parent_name | depth |
+----+----------+--------+-------------+-------+
| 6 | keira | 5 | eva | 2 |
+----+----------+--------+-------------+-------+
1 row in set (0.00 sec)
$sqlCmd = sprintf("call names_hier(%d,'%s')", $id, $name); // dont forget to escape $name
$result = $db->query($sqlCmd);
完全なスクリプト
drop table if exists names;
create table names
(
id smallint unsigned not null auto_increment primary key,
name varchar(255) not null,
parent smallint unsigned null,
key (parent)
)
engine = innodb;
insert into names (name, parent) values
('f00',null),
('ali',1),
('megan',1),
('jessica',3),
('eva',3),
('keira',5),
('mandy',6),
('anna',6);
drop procedure if exists names_hier;
delimiter #
create procedure names_hier
(
in p_id smallint unsigned,
in p_name varchar(255)
)
begin
declare v_done tinyint unsigned default(0);
declare v_dpth smallint unsigned default(0);
set p_name = trim(replace(p_name,'%',''));
create temporary table hier(
parent smallint unsigned,
id smallint unsigned,
depth smallint unsigned
)engine = memory;
insert into hier select parent, id, v_dpth from names where id = p_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 names n inner join tmp on n.parent = tmp.id and tmp.depth = v_dpth) then
insert into hier select n.parent, n.id, v_dpth + 1
from names n inner join tmp on n.parent = tmp.id and tmp.depth = v_dpth;
set v_dpth = v_dpth + 1;
truncate table tmp;
insert into tmp select * from hier where depth = v_dpth;
else
set v_done = 1;
end if;
end while;
select
n.id,
n.name as emp_name,
p.id as parent,
p.name as parent_name,
hier.depth
from
hier
inner join names n on hier.id = n.id
left outer join names p on hier.parent = p.id
where
n.name like concat(p_name, '%');
drop temporary table if exists hier;
drop temporary table if exists tmp;
end #
delimiter ;
-- call this sproc from your php
call names_hier(1, 'a');
call names_hier(3, 'k');