Table: item Create Table: CREATE TABLE `item` ( `persistence_object_identifier` varchar(40) COLLATE utf8mb4_unicode_ci NOT NULL, `store` varchar(40) COLLATE utf8mb4_unicode_ci DEFAULT NULL, `price` varchar(40) COLLATE utf8mb4_unicode_ci DEFAULT NULL, `id` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, `name` varchar(255) COLLATE utf8mb4_unicode_ci NOT NULL, PRIMARY KEY (`persistence_object_identifier` ), KEY `IDX_1F1B251EFF575877` (`store`), KEY `IDX_1F1B251ECAC822D9` (`price`), CONSTRAINT `FK_1F1B251ECAC822D9` FOREIGN KEY (`price`) REFERENCES `price` (`persistence_object_identifier` ), CONSTRAINT `FK_1F1B251EFF575877` FOREIGN KEY (`store`) REFERENCES `store` (`persistence_object_identifier` ) ) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_unicode_ci 1 row in set (0.00 sec) この3つが UUID