MySQL/MariaDB BIN_TO_UUID and UUID_TO_BIN Polyfill

gistfile1.txt

DELIMITER //

CREATE FUNCTION BIN_TO_UUID(b BINARY(16))
RETURNS CHAR(36)
BEGIN
   DECLARE hexStr CHAR(32);
   SET hexStr = HEX(b);
   RETURN LOWER(CONCAT(
        SUBSTR(hexStr, 1, 8), '-',
        SUBSTR(hexStr, 9, 4), '-',
        SUBSTR(hexStr, 13, 4), '-',
        SUBSTR(hexStr, 17, 4), '-',
        SUBSTR(hexStr, 21)
    ));
END//

CREATE FUNCTION UUID_TO_BIN(uuid CHAR(36))
RETURNS BINARY(16)
BEGIN
    RETURN UNHEX(REPLACE(uuid, '-', ''));
END//

DELIMITER ;

excellent. I just happened to stumble on your gist first. Hence my two cents.