salix/db/routines/vn/procedures/zone_getFromGeo.sql

DELIMITER $$
CREATE OR REPLACE DEFINER=`vn`@`localhost` PROCEDURE `vn`.`zone_getFromGeo`(vGeoFk INT)
BEGIN
/**
 * Returns all zones which have the passed geo included.
 *
 * @param vGeoFk The geo id
 * @return tmp.zone(id) The list of zones
 */
 	DECLARE vChildFk INT DEFAULT vGeoFk;
 	DECLARE vParentFk INT;
    DECLARE vLevel INT DEFAULT 1;
	
    DROP TEMPORARY TABLE IF EXISTS tNodes;
	CREATE TEMPORARY TABLE tNodes
		(PRIMARY KEY (id))
        ENGINE = MEMORY
		SELECT vGeoFk id, vLevel `level`;
 
	myLoop: LOOP
		SELECT parentFk INTO vParentFk
			FROM zoneGeo
			WHERE id = vChildFk;
		
        SET vChildFk = vParentFk;
        SET vLevel = vLevel + 1;

		INSERT IGNORE INTO tNodes
			SELECT vChildFk, vLevel
				FROM DUAL
				WHERE vChildFk IS NOT NULL;
        
        IF ROW_COUNT() = 0 THEN
			LEAVE myLoop;
		END IF;
    END LOOP;

    DROP TEMPORARY TABLE IF EXISTS tmp.zone;
    CREATE TEMPORARY TABLE tmp.zone
		(INDEX (id))
		ENGINE = MEMORY
        SELECT id FROM (
			SELECT zoneFk id, isIncluded
				FROM (
					SELECT i.zoneFk, i.isIncluded
						FROM tNodes n
							JOIN zoneIncluded i ON i.geoFk = n.id
						ORDER BY zoneFk, n.`level`
						LIMIT 10000000000000000000
				) t
				GROUP BY id HAVING isIncluded
		) t;

	DROP TEMPORARY TABLE tNodes;
END$$
DELIMITER ;