MYSQL : CRÉATION D'UN GUID

DROP FUNCTION IF EXISTS `CreateGUID`;
DELIMITER ;;
CREATE FUNCTION `CreateGUID`() RETURNS VARCHAR(32)
NOT DETERMINISTIC READS SQL DATA
BEGIN
DECLARE i TINYINT(1) DEFAULT 1;
DECLARE strValid VARCHAR(16) DEFAULT '0123456789ABCDEF';
DECLARE guid VARCHAR(32) DEFAULT '';
DECLARE pos TINYINT(2);
REPEAT
SELECT FLOOR(1 + RAND() * (LENGTH(strValid) - 1)) INTO pos;
SELECT CONCAT(guid, SUBSTR(strValid, pos, 1)) INTO guid;
SELECT i + 1 INTO i;
UNTIL i > 32 END REPEAT;
RETURN guid;
END;;
DELIMITER ;