mysql中是否有类似于php的iconv的函数将重音的utf8字符转换为ascii字符串？
我想要SQL查询，如下所示：
SELECT some_func("LĄBĄS VĄKĄRŪŠ")
并返回labas vakarus
答案 0 :(得分：2)
我找到了this MySQL transliteration功能，这可能就是你要找的东西。
您可以在作者的the associated blog post处阅读更多相关信息。
我的建议是不要相信MySQL和PHP iconv()音译产生相同的结果，因为它们都是猜测。如果你只是坚持使用MySQL或PHP方面，那将是最好的。
答案 1 :(得分：1)
在MySQL中创建搜索引擎友好URL地址的功能。
DELIMITER ;;
CREATE FUNCTION `cool_url` (`original` varchar(512) CHARSET utf8mb4 COLLATE utf8mb4_bin) RETURNS varchar(512) CHARSET utf8mb4
BEGIN
DECLARE translit VARCHAR(512) DEFAULT '';
DECLARE len INT(3) DEFAULT 0;
DECLARE pos INT(3) DEFAULT 1;
DECLARE letter VARCHAR(2);
SET original = TRIM(LOWER(original));
SET len = CHAR_LENGTH(original);
WHILE (pos <= len) DO
# get one letter from original
SET letter = SUBSTRING(original, pos, 1) COLLATE utf8mb4_bin;
CASE TRUE
# basic chars
WHEN letter IN ('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','w','x','y','z','0','1','2','3','4','5','6','7','8','9' COLLATE utf8mb4_bin) THEN SET letter = letter;
# chars with diacritics and azbuka
WHEN letter IN('á','à','â','ä','å','ā','ą','ă' COLLATE utf8mb4_bin) THEN SET letter = 'a';
WHEN letter IN('б' COLLATE utf8mb4_bin) THEN SET letter = 'b';
WHEN letter IN('č','ć','ç','ć' COLLATE utf8mb4_bin) THEN SET letter = 'c';
WHEN letter IN('ď','đ','д' COLLATE utf8mb4_bin) THEN SET letter = 'd';
WHEN letter IN('é','ě','ë','ё','è','ê','ē','ę','ь','э','œ' COLLATE utf8mb4_bin) THEN SET letter = 'e';
WHEN letter IN('ф','ѳ' COLLATE utf8mb4_bin) THEN SET letter = 'f';
WHEN letter IN('ģ','ğ','г' COLLATE utf8mb4_bin) THEN SET letter = 'g';
WHEN letter IN('í','î','ï','ī','î','і','и','й' COLLATE utf8mb4_bin) THEN SET letter = 'i';
WHEN letter IN('ķ','к' COLLATE utf8mb4_bin) THEN SET letter = 'k';
WHEN letter IN('ľ','ĺ','ļ','ł','л' COLLATE utf8mb4_bin) THEN SET letter = 'l';
WHEN letter IN('м' COLLATE utf8mb4_bin) THEN SET letter = 'm';
WHEN letter IN('ň','ņ','ń','ñ','н' COLLATE utf8mb4_bin) THEN SET letter = 'n';
WHEN letter IN('ó','ö','ø','õ','ô','ő','ơ','о' COLLATE utf8mb4_bin) THEN SET letter = 'o';
WHEN letter IN('п' COLLATE utf8mb4_bin) THEN SET letter = 'p';
WHEN letter IN('ŕ','ř','р' COLLATE utf8mb4_bin) THEN SET letter = 'r';
WHEN letter IN('š','ś','ș','ş','с','ß' COLLATE utf8mb4_bin) THEN SET letter = 's';
WHEN letter IN('ť','ț','т' COLLATE utf8mb4_bin) THEN SET letter = 't';
WHEN letter IN('ú','ů','ü','ù','û','ū','ű','ư','у' COLLATE utf8mb4_bin) THEN SET letter = 'u';
WHEN letter IN('в' COLLATE utf8mb4_bin) THEN SET letter = 'v';
WHEN letter IN('ý','ы','ѵ' COLLATE utf8mb4_bin) THEN SET letter = 'y';
WHEN letter IN('ž','ź','ż','з' COLLATE utf8mb4_bin) THEN SET letter = 'z';
WHEN letter = 'х' COLLATE utf8mb4_bin THEN SET letter = 'kh'; -- is not X
WHEN letter = 'ю' COLLATE utf8mb4_bin THEN SET letter = 'ju';
WHEN letter = 'я' COLLATE utf8mb4_bin THEN SET letter = 'ja';
WHEN letter = 'ж' COLLATE utf8mb4_bin THEN SET letter = 'zh';
WHEN letter = 'ч' COLLATE utf8mb4_bin THEN SET letter = 'ch';
WHEN letter = 'ш' COLLATE utf8mb4_bin THEN SET letter = 'sh';
WHEN letter = 'щ' COLLATE utf8mb4_bin THEN SET letter = 'shch';
WHEN letter = 'ѣ' COLLATE utf8mb4_bin THEN SET letter = 'ie';
WHEN letter = 'ц' COLLATE utf8mb4_bin THEN SET letter = 'ts';
WHEN letter = 'ъ' COLLATE utf8mb4_bin THEN SET letter = ''; -- hard sign
WHEN letter = 'ь' COLLATE utf8mb4_bin THEN SET letter = ''; -- soft sign
ELSE SET letter = '-';
END CASE;
# joining new string
SET translit = CONCAT(translit, letter);
SET pos = pos + 1;
END WHILE;
# replacing more dashes by one
WHILE (translit REGEXP '\-{2,}') DO
SET translit = REPLACE(translit, '--', '-');
END WHILE;
RETURN TRIM(BOTH '-' FROM translit);
END;;
DELIMITER ;
示例（测试）：
mysql> SELECT cool_url('BŒautiful day áàâäåāąă б čćçć ďđд éěëёèêēęьэœ фѳ ģğг íîïīîіий ķк ľĺļłл м ňņńñн óöøõôőơо п ŕřр šśșşсß ťțт úůüùûūűưу в ýыѵ žźżз х ю я ж ч ш щ ѣ ц ъ ь');
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
| beautiful-day-aaaaaaaa-b-cccc-ddd-eeeeeeeeeee-ff-ggg-iiiiiiii-kk-lllll-m-nnnnn-oooooooo-p-rrr-ssssss-ttt-uuuuuuuuu-v-yyy-zzzz-kh-ju-ja-zh-ch-sh-sh-ie-ts-e |
+----------------------------------------------------------------------------------------------------------------------------------------------------------------------------+
1 row in set (0.01 sec)
答案 2 :(得分：1)
我需要一个简单但快速的解决方案来为wp中的post标签创建数千个slug。所以这是我从上面的答案中取得的代码，我修改了元音和数字。希望它能在某一天帮助某人，因为它今天对我有所帮助。 ：）
DELIMITER $$
DROP FUNCTION IF EXISTS `transliterate` $$
CREATE FUNCTION `transliterate` (original VARCHAR(512)) RETURNS VARCHAR(512)
BEGIN
DECLARE translit VARCHAR(512) DEFAULT '';
DECLARE len INT(3) DEFAULT 0;
DECLARE pos INT(3) DEFAULT 1;
DECLARE letter CHAR(2);
SET original = TRIM(LOWER(original));
SET len = CHAR_LENGTH(original);
WHILE (pos <= len) DO
SET letter = SUBSTRING(original, pos, 1);
CASE TRUE
WHEN letter IN('á','à','â','ä','å','ā','ą','ă') THEN SET letter = 'a';
WHEN letter IN('č','ć','ç','ć') THEN SET letter = 'c';
WHEN letter IN('ď','đ') THEN SET letter = 'd';
WHEN letter IN('é','ě','ë','è','ê','ē','ę') THEN SET letter = 'e';
WHEN letter IN('ģ','ğ') THEN SET letter = 'g';
WHEN letter IN('í','î','ï','ī','î') THEN SET letter = 'i';
WHEN letter IN('ķ') THEN SET letter = 'k';
WHEN letter IN('ľ','ĺ','ļ','ł') THEN SET letter = 'l';
WHEN letter IN('ň','ņ','ń','ñ') THEN SET letter = 'n';
WHEN letter IN('ó','ö','ø','õ','ô','ő','ơ') THEN SET letter = 'o';
WHEN letter IN('ŕ','ř') THEN SET letter = 'r';
WHEN letter IN('š','ś','ș','ş') THEN SET letter = 's';
WHEN letter IN('ť','ț') THEN SET letter = 't';
WHEN letter IN('ú','ů','ü','ù','û','ū','ű','ư') THEN SET letter = 'u';
WHEN letter IN('ý') THEN SET letter = 'y';
WHEN letter IN('ž','ź','ż') THEN SET letter = 'z';
WHEN letter = 'а' THEN SET letter = 'a';
WHEN letter = 'б' THEN SET letter = 'b';
WHEN letter = 'в' THEN SET letter = 'v';
WHEN letter = 'г' THEN SET letter = 'g';
WHEN letter = 'д' THEN SET letter = 'd';
WHEN letter = 'е' THEN SET letter = 'e';
WHEN letter = 'ё' THEN SET letter = 'e';
WHEN letter = 'ж' THEN SET letter = 'z';
WHEN letter = 'з' THEN SET letter = 'z';
WHEN letter = 'и' THEN SET letter = 'i';
WHEN letter = 'й' THEN SET letter = 'i';
WHEN letter = 'к' THEN SET letter = 'k';
WHEN letter = 'л' THEN SET letter = 'l';
WHEN letter = 'м' THEN SET letter = 'm';
WHEN letter = 'н' THEN SET letter = 'n';
WHEN letter = 'о' THEN SET letter = 'o';
WHEN letter = 'п' THEN SET letter = 'p';
WHEN letter = 'р' THEN SET letter = 'r';
WHEN letter = 'с' THEN SET letter = 's';
WHEN letter = 'т' THEN SET letter = 't';
WHEN letter = 'у' THEN SET letter = 'u';
WHEN letter = 'ф' THEN SET letter = 'f';
WHEN letter = 'х' THEN SET letter = 'ch';
WHEN letter = 'ц' THEN SET letter = 'c';
WHEN letter = 'ч' THEN SET letter = 'c';
WHEN letter = 'ш' THEN SET letter = 's';
WHEN letter = 'щ' THEN SET letter = 's';
WHEN letter = 'ъ' THEN SET letter = '';
WHEN letter = 'ы' THEN SET letter = 'y';
WHEN letter = 'ь' THEN SET letter = 'e';
WHEN letter = 'э' THEN SET letter = 'e';
WHEN letter = 'ю' THEN SET letter = 'ju';
WHEN letter = 'я' THEN SET letter = 'ja';
WHEN letter = '0' THEN SET letter = '0';
WHEN letter = '1' THEN SET letter = '1';
WHEN letter = '2' THEN SET letter = '2';
WHEN letter = '3' THEN SET letter = '3';
WHEN letter = '4' THEN SET letter = '4';
WHEN letter = '5' THEN SET letter = '5';
WHEN letter = '6' THEN SET letter = '6';
WHEN letter = '7' THEN SET letter = '7';
WHEN letter = '8' THEN SET letter = '8';
WHEN letter = '9' THEN SET letter = '9';
WHEN letter IN ('a','b','c','d','e','f','g','h','i','j','k','l','m','n','o','p','q','r','s','t','u','v','x','y','z')
THEN SET letter = letter;
ELSE
SET letter = '-';
END CASE;
SET translit = CONCAT(translit, letter);
SET pos = pos + 1;
END WHILE;
WHILE (translit REGEXP '\-{2,}') DO
SET translit = REPLACE(translit, '--', '-');
END WHILE;
RETURN TRIM(BOTH '-' FROM translit);
END $$
DELIMITER ;