mysql urldecode的最佳实践

???MySQL???????URL????????(urldecode),????MySQL?????UNHEX?CONVERT????

???????????:

1. ??????????????URL?????:

DELIMITER $$

CREATE FUNCTION urldecode(input VARCHAR(255))
RETURNS VARCHAR(255)
DETERMINISTIC
BEGIN
    DECLARE output VARCHAR(255) DEFAULT '';
    DECLARE temp VARCHAR(2) DEFAULT '';
    DECLARE i INT DEFAULT 1;
    
    WHILE i <= LENGTH(input) DO
        IF SUBSTRING(input, i, 1) = '%' THEN
            SET temp = CONCAT(SUBSTRING(input, i+1, 1), SUBSTRING(input, i+2, 1));
            SET output = CONCAT(output, CHAR(CONVERT(UNHEX(temp), UNSIGNED INTEGER)));
            SET i = i + 3;
        ELSE
            SET output = CONCAT(output, SUBSTRING(input, i, 1));
            SET i = i + 1;
        END IF;
    END WHILE;

    RETURN output;
END$$

DELIMITER ;

2. ????????????URL?????:

SELECT urldecode('https://www.google.com/') AS decoded_url;

????????URL:https://www.google.com/

??????????,???????MySQL??????URL?????,?????????