19

有没有办法执行 MySQL 查询并让输出中的一列直接 urldecode，而不是让 PHP 来做。

例如，此表“联系人”将包含，

----------------------------------
|姓名 |邮箱 |
----------------------------------
|约翰·史密斯|johnsmith%40hotmail.com|
----------------------------------
SELECT * FROM `contacts`

会输出，

约翰·史密斯 | 约翰史密斯%40@hotmail.com

有没有类似的东西，

SELECT name, urldecode(email) FROM `contacts`

要输出，

约翰·史密斯 | johnsmith@hotmail.com

4

8 回答 8

29

如果有人还在寻找 mysql 解码功能：

DROP TABLE IF EXISTS urlcodemap;

CREATE TABLE `urlcodemap` (
  `id` INT(11) NOT NULL AUTO_INCREMENT,
  `encoded` VARCHAR(128) NOT NULL,
  `decoded` VARCHAR(128) NOT NULL,
  UNIQUE KEY urlcodemapUIdx1(encoded),
  PRIMARY KEY (`id`)  
) ENGINE=INNODB AUTO_INCREMENT=1 DEFAULT CHARSET=utf8;

-- Table that contains the list of encode\decode.
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%20"," ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%21","!");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%22","""");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%23","#");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%24","$");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%25","%");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%26","&");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%27","'");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%28","(");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%29",")");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%2A","*");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%2B","+");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%2C",",");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%2D","-");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%2E",".");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%2F","/");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%30","0");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%31","1");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%32","2");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%33","3");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%34","4");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%35","5");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%36","6");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%37","7");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%38","8");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%39","9");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%3A",":");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%3B",";");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%3C","<");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%3D","=");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%3E",">");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%3F","?");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%40","@");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%41","A");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%42","B");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%43","C");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%44","D");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%45","E");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%46","F");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%47","G");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%48","H");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%49","I");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%4A","J");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%4B","K");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%4C","L");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%4D","M");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%4E","N");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%4F","O");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%50","P");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%51","Q");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%52","R");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%53","S");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%54","T");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%55","U");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%56","V");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%57","W");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%58","X");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%59","Y");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%5A","Z");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%5B","[");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%5C","\\");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%5D","]");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%5E","^");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%5F","_");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%60","`");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%61","a");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%62","b");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%63","c");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%64","d");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%65","e");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%66","f");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%67","g");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%68","h");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%69","i");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%6A","j");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%6B","k");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%6C","l");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%6D","m");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%6E","n");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%6F","o");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%70","p");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%71","q");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%72","r");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%73","s");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%74","t");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%75","u");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%76","v");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%77","w");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%78","x");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%79","y");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%7A","z");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%7B","{");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%7C","|");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%7D","}");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%7E","~");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%80","`");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%82","‚");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%83","ƒ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%84","„");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%85","…");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%86","†");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%87","‡");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%88","ˆ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%89","‰");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%8A","Š");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%8B","‹");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%8C","Œ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%8E","Ž");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%91","‘");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%92","’");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%93","“");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%94","”");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%95","•");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%96","–");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%97","—");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%98","˜");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%99","™");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%9A","š");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%9B","›");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%9C","œ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%9E","ž");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%9F","Ÿ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A1","¡");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A2","¢");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A3","£");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A4","¤");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A5","¥");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A6","¦");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A7","§");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A8","¨");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%A9","©");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%AA","ª");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%AB","«");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%AC","¬");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%AE","®");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%AF","¯");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B0","°");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B1","±");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B2","²");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B3","³");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B4","´");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B5","µ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B6","¶");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B7","·");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B8","¸");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%B9","¹");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%BA","º");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%BB","»");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%BC","¼");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%BD","½");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%BE","¾");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%BF","¿");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C0","À");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C1","Á");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C2","Â");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C3","Ã");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C4","Ä");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C5","Å");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C6","Æ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C7","Ç");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C8","È");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%C9","É");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%CA","");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%CB","Ë");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%CC","Ì");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%CD","Í");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%CE","Î");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%CF","Ï");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D0","Ð");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D1","Ñ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D2","Ò");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D3","Ó");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D4","Ô");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D5","Õ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D6","Ö");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D7","×");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D8","Ø");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%D9","Ù");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%DA","Ú");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%DB","Û");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%DC","Ü");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%DD","Ý");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%DE","Þ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%DF","ß");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E0","à");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E1","á");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E2","â");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E3","ã");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E4","ä");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E5","å");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E6","æ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E7","ç");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E8","è");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%E9","é");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%EA","ê");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%EB","ë");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%EC","ì");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%ED","í");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%EE","î");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%EF","ï");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F0","ð");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F1","ñ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F2","ò");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F3","ó");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F4","ô");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F5","õ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F6","ö");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F7","÷");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F8","ø");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%F9","ù");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%FA","ú");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%FB","û");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%FC","ü");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%FD","ý");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%FE","þ");
INSERT INTO urlcodemap (encoded,decoded) VALUES ("%FF","ÿ");

DELIMITER $$

DROP FUNCTION IF EXISTS `URLDECODER`$$

CREATE FUNCTION `URLDECODER`(str VARCHAR(4096) CHARSET utf8) RETURNS VARCHAR(4096) DETERMINISTIC
BEGIN
               DECLARE X  INT;               
               DECLARE chr VARCHAR(256);
               DECLARE chrto VARCHAR(256);
               DECLARE result VARCHAR(4096);
               SET X = 1;
               WHILE X  <= (SELECT MAX(id) FROM urlcodemap) DO
                   SET chr = (SELECT `encoded` FROM urlcodemap WHERE id = X);
                   SET chrto = (SELECT `decoded` FROM urlcodemap WHERE id = X);                
                           SET str = REPLACE(str,chr,chrto);
                           SET  X = X + 1;                           
               END WHILE;
               RETURN str;
       END$$

DELIMITER ;

使用示例

SELECT urldecoder('http://testing.com/questions/7031469/is%20this%20working');
于 2013-07-29T11:27:24.083 回答
13

我觉得回答原始问题很重要（不管替代方案如何），主要是因为它被问到并且是一个有效的问题：

简短的回答：你不能。

没有用于解码 URL 编码字符串的本机 SQL 函数。

长答案：您需要编写一个自定义 SQL 函数：

编码/解码 MySQL 函数：http ://www.dzone.com/snippets/urlencodeurldecode-mysql

最佳答案：任何 URL 编码都可以存储为 UTF8。

通过以下方式将表更改为 UTF8：转储、将“latin1”替换为“utf8”，然后导入。然后运行一个脚本（只需一次），例如 PHP、Python 或 Rails 来解码您的列并将其存储回来。现在您已准备好按预期使用您的数据库。没有开销。

执行此操作的 Python 代码：

import urllib

import MySQLdb

def decode():

  con = MySQLdb.Connect(host="127.0.0.1", port=3306, user="root", passwd="", db="hostip")
  cursor = con.cursor()

  cursor.execute("SELECT city, name FROM cityByCountry")

  for row in cursor.fetchall():
    print row
    cursor.execute("UPDATE cityByCountry SET name=%s WHERE city=%s", (urllib.unquote(row[1]), row[0]))

if __name__ == "__main__":
  decode()
于 2013-02-10T18:09:37.570 回答
3

我的解决方案是声明存储函数来解码 url 编码的字符串：

DELIMITER $$

DROP FUNCTION IF EXISTS URL_DECODE $$

CREATE FUNCTION URL_DECODE (str text) 
RETURNS text
DETERMINISTIC
BEGIN 
    DECLARE result text;
    DECLARE ind INT DEFAULT 0;

    SET result = REPLACE(str, '+', ' ');

    WHILE ind <= 255 DO
       SET result = REPLACE(result, CONCAT('%', LPAD(LOWER(HEX(ind)), 2, 0)), CHAR(ind));
       SET result = REPLACE(result, CONCAT('%', LPAD(HEX(ind), 2, 0)), CHAR(ind));
       SET ind = ind + 1;
    END WHILE;

    RETURN result;
END$$

DELIMITER ;

而不是使用它的下一个方式：

SELECT URL_DECODE('johnsmith%40hotmail.com')
于 2017-03-24T12:45:06.813 回答
1

在选择可能包含编码 URL 特殊字符$ & + , / : ; = ? @（不包括空格）的数据记录并这样做（示例代码）时，我需要一个解决方案：

SELECT * FROM `table` WHERE `field` REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(REPLACE(`field`,'%24','$'),'%26','&'),'%2B','+'),'%2C',','),'%2F','/'),'%3A',':'),'%3B',';'),'%3D','='),'%3F','?'),'%40','@') LIKE '/example-request-uri?'
于 2015-12-13T15:05:41.837 回答
1

受 Mistdemon 的回答启发，我使用了以下函数：

DELIMITER $$
DROP FUNCTION IF EXISTS `url_decode`$$
CREATE FUNCTION `url_decode`(str VARCHAR(255) CHARSET utf8) RETURNS VARCHAR(255) CHARSET utf8 DETERMINISTIC
BEGIN
    DECLARE X  INT;               
    SET X = 128;
    WHILE X  < 192 DO
        SET str = REPLACE(str, CONCAT('%C5%', HEX(X)), UNHEX(CONCAT('C5', HEX(X))));
        SET str = REPLACE(str, CONCAT('%C4%', HEX(X)), UNHEX(CONCAT('C4', HEX(X))));
        SET str = REPLACE(str, CONCAT('%C3%', HEX(X)), UNHEX(CONCAT('C3', HEX(X))));
        SET  X = X + 1;                           
    END WHILE;
    SET X = 32;
    WHILE X  < 127 DO
        SET str = REPLACE(str, CONCAT('%', HEX(X)), UNHEX(HEX(X)));
        SET  X = X + 1;                           
    END WHILE;
    RETURN REPLACE(str, '+', ' ');
END$$
DELIMITER ;
SELECT url_decode('/pl/tagi/mi%C5%82o%C5%9B%C4%87');

如果您知道可以期待哪些字符，那就太好了。在上面的代码中，它只转换来自 C3、C4 和 C5 范围的单字节和 2 字节字符。对于更多字符，您需要更多 REPLACE 迭代。

如果您需要解码所有 utf8 字符，可以使用以下函数。它比以前的更快，但如果您的字符串编码不正确，则可能会出现更多错误。

DELIMITER $$
DROP FUNCTION IF EXISTS `url_decode`$$
CREATE FUNCTION `url_decode`(str VARCHAR(255) CHARSET utf8) RETURNS VARCHAR(255) DETERMINISTIC
BEGIN
    DECLARE end INT;
    DECLARE start INT;
    SET start = LOCATE('%', str);
    WHILE start > 0 DO
        SET end = start;
        WHILE SUBSTRING(str, end, 1) = '%' AND UPPER(SUBSTRING(str, end + 1, 1)) IN ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F') AND UPPER(SUBSTRING(str, end + 2, 1)) IN ('0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'A', 'B', 'C', 'D', 'E', 'F') DO
            SET end = end + 3;
        END WHILE;
        IF start <> end THEN
            SET str = INSERT(str, start, end - start, UNHEX(REPLACE(SUBSTRING(str, start, end - start), '%', '')));
        END IF;
        SET start = LOCATE('%', str, start + 1);
    END WHILE;
    RETURN REPLACE(str, '+', ' ');
END$$
DELIMITER ;
SELECT url_decode('/bg/%D0%B8%D0%B3%D1%80%D0%B8%D1%82%D0%B5-%D0%BD%D0%B0-%D0%B3%D0%BB%D0%B0%D0%B4%D0%B0');
于 2020-05-01T19:46:06.513 回答
0

扩展@fela的答案：

CREATE FUNCTION `url_decode`(str VARCHAR(255) CHARSET utf8) RETURNS VARCHAR(255) DETERMINISTIC
BEGIN
  DECLARE X  INT;
  SET X = 128;
  WHILE X  < 192 DO
    SET str = REPLACE(str, CONCAT('%C5%', HEX(X)), UNHEX(CONCAT('C5', HEX(X))));
    SET str = REPLACE(str, CONCAT('%C4%', HEX(X)), UNHEX(CONCAT('C4', HEX(X))));
    SET str = REPLACE(str, CONCAT('%C3%', HEX(X)), UNHEX(CONCAT('C3', HEX(X))));
    SET  X = X + 1;
  END WHILE;
  SET X = 32;
  WHILE X  < 127 DO
    SET str = REPLACE(str, CONCAT('%', HEX(X)), UNHEX(HEX(X)));
    SET  X = X + 1;
  END WHILE;
  SET X = 168; -- C2
  WHILE X  < 192 DO
    SET str = REPLACE(str, CONCAT('%', HEX(X)), UNHEX(CONCAT('C2', HEX(X))));
    SET  X = X + 1;
  END WHILE;
  SET X = 192; -- C3
  WHILE X  < 256 DO
    SET str = REPLACE(str, CONCAT('%', HEX(X)), UNHEX(CONCAT('C3', HEX(X-64))));
    SET  X = X + 1;
  END WHILE;
  SET X = 256; -- C4
  WHILE X  < 320 DO
    SET str = REPLACE(str, CONCAT('%', HEX(X)), UNHEX(CONCAT('C4', HEX(X-128))));
    SET  X = X + 1;
  END WHILE;
  SET X = 320; -- C5
  WHILE X  < 384 DO
    SET str = REPLACE(str, CONCAT('%', HEX(X)), UNHEX(CONCAT('C5', HEX(X-192))));
    SET  X = X + 1;
  END WHILE;
  RETURN REPLACE(str, '+', ' ');
END

查看新的四个 while 块——它们可以解码非标准的 C2、C3、C4 和 C5 块。这些可能来自使用的块escape是 HTML 编码而不是 UTF 编码。@Mistdemon 的回答也使用这些编码（至少 C2 和 C3）而不是更现代的多字节 UTF 编码（encodeURIComponent）。

于 2020-08-06T12:51:39.833 回答
0

我的回答与 Mistdemon 非常相似，但有以下变化：

(1) 这一行应该是顶部插入：

INSERT INTO urlcodemap (encoded,decoded) VALUES ("%25","%");

否则，空格会显示为 %2520 而不是 %20，因为空格在 %....

(2) 如果是post 的URL 编码，去掉AZ、az 和0-9 的所有行。邮政服务器绝对可以读取标准的字母和数字……而且整个事情看起来不像狼吞虎咽。

于 2016-01-24T21:23:25.053 回答
-3

在将查询响应传递给用于 JQuery 自动完成的 json_encode 之前，我设法使用单独的一行 PHP 代码对 SQL 语句返回的查询响应进行 urldecode。

于 2011-08-11T14:39:51.777 回答