USE art_relations;; DROP PROCEDURE IF EXISTS sp_add_track;; CREATE DEFINER=theorchard@127.0.0.1 PROCEDURE sp_add_track(IN the_upc BIGINT, IN the_cd INT) BEGIN DECLARE newTrack INT DEFAULT 0; DECLARE the_release_id INT DEFAULT 0; DECLARE lock_name VARCHAR(100); DECLARE temp_select_out INT DEFAULT 0; DECLARE EXIT HANDLER FOR SQLEXCEPTION BEGIN SELECT 0 AS success; ROLLBACK; END; START TRANSACTION; SELECT MAX(track_id) + 1, release_id INTO newTrack, the_release_id FROM track WHERE upc = the_upc AND cd = the_cd; IF (newTrack IS NULL) THEN SELECT 1 INTO newTrack; SELECT release_id INTO the_release_id FROM releases WHERE upc = the_upc; END IF; IF (the_release_id IS NULL) THEN SELECT -1 AS success; ROLLBACK; END IF; SET lock_name = CONCAT(the_upc, '_', the_cd, '_', newTrack); IF (IS_FREE_LOCK(lock_name)) THEN IF (GET_LOCK(lock_name, 5)) THEN INSERT INTO track (upc, cd, release_id, track_id) VALUES (the_upc, the_cd, the_release_id, newTrack); IF ROW_COUNT() > 0 THEN SELECT LAST_INSERT_ID() AS success; ELSE SELECT -4 AS success; ROLLBACK; END IF; SELECT RELEASE_LOCK(lock_name) INTO temp_select_out; ELSE SELECT -3 AS success; ROLLBACK; END IF; ELSE SELECT -2 AS success; ROLLBACK; END IF; COMMIT; END;; DROP PROCEDURE IF EXISTS `art_relations`.`sp_add_track`;;