एक काफी सरल पुनरावृति आसन्न सूची डीबी सर्वर साइड समाधान:http://pastie.org/1056977
delimiter ;
drop procedure if exists employee_hier;
delimiter #
create procedure employee_hier
(
in p_emp_id smallint unsigned
)
begin
declare p_done tinyint unsigned default(0);
declare p_depth smallint unsigned default(0);
create temporary table hier(
boss_id smallint unsigned,
emp_id smallint unsigned,
depth smallint unsigned
)engine = memory;
insert into hier values (null, p_emp_id, p_depth);
/* http://dev.mysql.com/doc/refman/5.0/en/temporary-table-problems.html */
create temporary table emps engine=memory select * from hier;
while p_done <> 1 do
if exists( select 1 from employee e inner join hier on e.boss_id = hier.emp_id and hier.depth = p_depth) then
insert into hier select e.boss_id, e.emp_id, p_depth + 1
from employee e inner join emps on e.boss_id = emps.emp_id and emps.depth = p_depth;
set p_depth = p_depth + 1;
truncate table emps;
insert into emps select * from hier where depth = p_depth;
else
set p_done = 1;
end if;
end while;
select
e.emp_id,
e.name as emp_name,
b.emp_id as boss_emp_id,
b.name as boss_name,
hier.depth
from
hier
inner join employee e on hier.emp_id = e.emp_id
inner join employee b on hier.boss_id = b.emp_id;
drop temporary table if exists hier;
drop temporary table if exists emps;
end #
delimiter ;
call employee_hier(1);
call employee_hier(3);
