få en rekursiv forældreliste

Her lavede jeg en lille funktion til dig, jeg tjekkede den i min database (MAMP), og den fungerer fint

use mySchema;
drop procedure if exists getParents;

DELIMITER $$
CREATE PROCEDURE getParents (in_ID int)
BEGIN
DROP TEMPORARY TABLE IF EXISTS results;
DROP TEMPORARY TABLE IF EXISTS temp2;
DROP TEMPORARY TABLE IF EXISTS temp1;

CREATE TEMPORARY TABLE temp1 AS
  select distinct ID, parentID
    from tasks
    where parentID = in_ID;

create TEMPORARY table results AS
  Select ID, parentID from temp1;

WHILE (select count(*) from temp1) DO
  create TEMPORARY table temp2 as
    select distinct ID, parentID 
      from tasks 
      where parentID in (select ID from temp1);

  insert into results select ID, parentID from temp2;
  drop TEMPORARY table if exists temp1;
  create TEMPORARY table temp1 AS
    select ID, parentID from temp2;
  drop TEMPORARY table if exists temp2;

END WHILE;


select * from results;

DROP TEMPORARY TABLE IF EXISTS results;
DROP TEMPORARY TABLE IF EXISTS temp1;

END $$
DELIMITER ;

denne kode vil returnere alle forældre til enhver dybde. Du kan naturligvis tilføje yderligere felter til resultaterne

brug det sådan her

call getParents(9148)

for eksempel