MySQL将拉丁字符扁平化为非拉丁字符

2023年3月14日 169次阅读

我正在寻找一个
MySQL函数来将每个特殊拉丁字符(不要与latin1字符集混淆 – 我使用的是utf8)转换为标准A-Z字母范围内的非拉丁字母.

这就是我真正希望实现的目标：

'Zażółć gęślą jaźń' --> 'Zazolc gesla jazn'

我用CONVERT和CAST函数尝试了很多不同的特技.到目前为止没有成功.

我也非常深入地搜索过,不幸的是MySQL与字符转换有关的每一个问题都是典型的latin1默认排序规则,这不是我想要的.

我的目标是通过TRIGGER将产品名称转换为uri友好字符串… AFTER INSERT,例如

Crème Brûlée --> creme_brulee

这些转换后的名称不仅可以作为SEO URI,还可以作为缩略图文件名的引用.

除了LOWER(@str)和REPLACE(@str,”,’_’)之外,其中一个步骤是展平那些拉丁字符.

我宁愿将这些转换后的名称保留在数据库中,尽管您可能在架构的角度知道一些更正确的方法吗？

最佳答案 好吧,Sami Kuhmonen对我的问题的评论几乎耗尽了所有可能性.

但我不得不使用任何有效的解决方案,所以我决定从GitHub复制PHP Doctrine的Doctrine_Inflector：unaccent方法.MySQL实现definetely看起来不漂亮但我想嵌套REPLACE()函数是执行多个的唯一方法MySQL中的字符串替换.

这是整个TRIGGER：

 CREATE DEFINER = CURRENT_USER TRIGGER `product_BEFORE_INSERT` BEFORE INSERT ON `product` FOR EACH ROW

 # new value
 SET NEW.name_uri = LOWER(

 REPLACE( 

 # ugly set of nested replaces
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(
 REPLACE( REPLACE( REPLACE( REPLACE( REPLACE( REPLACE(

 # the original value
 NEW.name,

 # every accented latin character represented by its ASCII code
 # is replaced with normalized letter
 CHAR(195,128), 'A'),  CHAR(195,129), 'A'), CHAR(195,130), 'A'),  CHAR(195,131), 'A'), CHAR(195,132), 'A'),  CHAR(195,133), 'A'),
 CHAR(195,135), 'C'),  CHAR(195,136), 'E'), CHAR(195,137), 'E'),  CHAR(195,138), 'E'), CHAR(195,139), 'E'),  CHAR(195,140), 'I'),
 CHAR(195,141), 'I'),  CHAR(195,142), 'I'), CHAR(195,143), 'I'),  CHAR(195,145), 'N'), CHAR(195,146), 'O'),  CHAR(195,147), 'O'),
 CHAR(195,148), 'O'),  CHAR(195,149), 'O'), CHAR(195,150), 'O'),  CHAR(195,153), 'U'), CHAR(195,154), 'U'),  CHAR(195,155), 'U'),
 CHAR(195,156), 'U'),  CHAR(195,157), 'Y'), CHAR(195,159), 's'),  CHAR(195,160), 'a'), CHAR(195,161), 'a'),  CHAR(195,162), 'a'),
 CHAR(195,163), 'a'),  CHAR(195,164), 'a'), CHAR(195,165), 'a'),  CHAR(195,167), 'c'), CHAR(195,168), 'e'),  CHAR(195,169), 'e'),
 CHAR(195,170), 'e'),  CHAR(195,171), 'e'), CHAR(195,172), 'i'),  CHAR(195,173), 'i'), CHAR(195,174), 'i'),  CHAR(195,175), 'i'),
 CHAR(195,177), 'n'),  CHAR(195,178), 'o'), CHAR(195,179), 'o'),  CHAR(195,180), 'o'), CHAR(195,181), 'o'),  CHAR(195,182), 'o'),
 CHAR(195,182), 'o'),  CHAR(195,185), 'u'), CHAR(195,186), 'u'),  CHAR(195,187), 'u'), CHAR(195,188), 'u'),  CHAR(195,189), 'y'),
 CHAR(195,191), 'y'),
 # Decompositions for Latin Extended-A
 CHAR(196,128), 'A'),  CHAR(196,129), 'a'), CHAR(196,130), 'A'),  CHAR(196,131), 'a'), CHAR(196,132), 'A'),  CHAR(196,133), 'a'),
 CHAR(196,134), 'C'),  CHAR(196,135), 'c'), CHAR(196,136), 'C'),  CHAR(196,137), 'c'), CHAR(196,138), 'C'),  CHAR(196,139), 'c'),
 CHAR(196,140), 'C'),  CHAR(196,141), 'c'), CHAR(196,142), 'D'),  CHAR(196,143), 'd'), CHAR(196,144), 'D'),  CHAR(196,145), 'd'),
 CHAR(196,146), 'E'),  CHAR(196,147), 'e'), CHAR(196,148), 'E'),  CHAR(196,149), 'e'), CHAR(196,150), 'E'),  CHAR(196,151), 'e'),
 CHAR(196,152), 'E'),  CHAR(196,153), 'e'), CHAR(196,154), 'E'),  CHAR(196,155), 'e'), CHAR(196,156), 'G'),  CHAR(196,157), 'g'),
 CHAR(196,158), 'G'),  CHAR(196,159), 'g'), CHAR(196,160), 'G'),  CHAR(196,161), 'g'), CHAR(196,162), 'G'),  CHAR(196,163), 'g'),
 CHAR(196,164), 'H'),  CHAR(196,165), 'h'), CHAR(196,166), 'H'),  CHAR(196,167), 'h'), CHAR(196,168), 'I'),  CHAR(196,169), 'i'),
 CHAR(196,170), 'I'),  CHAR(196,171), 'i'), CHAR(196,172), 'I'),  CHAR(196,173), 'i'), CHAR(196,174), 'I'),  CHAR(196,175), 'i'),
 CHAR(196,176), 'I'),  CHAR(196,177), 'i'), CHAR(196,178), 'IJ'), CHAR(196,179), 'ij'), CHAR(196,180), 'J'),  CHAR(196,181), 'j'),
 CHAR(196,182), 'K'),  CHAR(196,183), 'k'), CHAR(196,184), 'k'),  CHAR(196,185), 'L'), CHAR(196,186), 'l'),  CHAR(196,187), 'L'),
 CHAR(196,188), 'l'),  CHAR(196,189), 'L'), CHAR(196,190), 'l'),  CHAR(196,191), 'L'), CHAR(197,128), 'l'),  CHAR(197,129), 'L'),
 CHAR(197,130), 'l'),  CHAR(197,131), 'N'), CHAR(197,132), 'n'),  CHAR(197,133), 'N'), CHAR(197,134), 'n'),  CHAR(197,135), 'N'),
 CHAR(197,136), 'n'),  CHAR(197,137), 'N'), CHAR(197,138), 'n'),  CHAR(197,139), 'N'), CHAR(197,140), 'O'),  CHAR(197,141), 'o'),
 CHAR(197,142), 'O'),  CHAR(197,143), 'o'), CHAR(197,144), 'O'),  CHAR(197,145), 'o'), CHAR(197,146), 'OE'), CHAR(197,147), 'oe'),
 CHAR(197,148), 'R'),  CHAR(197,149), 'r'), CHAR(197,150), 'R'),  CHAR(197,151), 'r'), CHAR(197,152), 'R'),  CHAR(197,153), 'r'),
 CHAR(197,154), 'S'),  CHAR(197,155), 's'), CHAR(197,156), 'S'),  CHAR(197,157), 's'), CHAR(197,158), 'S'),  CHAR(197,159), 's'),
 CHAR(197,160), 'S'),  CHAR(197,161), 's'), CHAR(197,162), 'T'),  CHAR(197,163), 't'), CHAR(197,164), 'T'),  CHAR(197,165), 't'),
 CHAR(197,166), 'T'),  CHAR(197,167), 't'), CHAR(197,168), 'U'),  CHAR(197,169), 'u'), CHAR(197,170), 'U'),  CHAR(197,171), 'u'),
 CHAR(197,172), 'U'),  CHAR(197,173), 'u'), CHAR(197,174), 'U'),  CHAR(197,175), 'u'), CHAR(197,176), 'U'),  CHAR(197,177), 'u'),
 CHAR(197,178), 'U'),  CHAR(197,179), 'u'), CHAR(197,180), 'W'),  CHAR(197,181), 'w'), CHAR(197,182), 'Y'),  CHAR(197,183), 'y'),
 CHAR(197,184), 'Y'),  CHAR(197,185), 'Z'), CHAR(197,186), 'z'),  CHAR(197,187), 'Z'), CHAR(197,188), 'z'),  CHAR(197,189), 'Z'),
 CHAR(197,190), 'z'),  CHAR(197,191), 's'),

 # Euro Sign
 CHAR(226,130,172), 'E'),
 # GBP (Pound) Sign
 CHAR(194,163), ''),
 'Ä', 'Ae'), 'ä', 'ae'), 'Ü', 'Ue'), 'ü', 'ue'),
 'Ö', 'Oe'), 'ö', 'oe'), 'ß', 'ss'),
 # Norwegian characters
 'Å', 'Aa'), 'Æ', 'Ae'), 'Ø', 'O'), 'æ', 'a'), 'ø', 'o'), 'å', 'aa')

 , ' ', '_'));
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