有没有一种简单的方法将MySQL数据转换为Title Case？

Question

我有一个MySQL表,其中一列中的所有数据都是以大写形式输入的,但是我需要转换为标题大小写,并且识别出类似于Daring Fireball Title Case脚本的"小词" .

我找到了将字符串转换为小写的优秀解决方案,但标题大小写功能似乎已被排除在我的MySQL版本之外.有一种优雅的方式来做到这一点？

Answer 1

编辑

找到了!从字面上看我的第一个SQL函数.不提供保修.使用前备份数据.:)

首先,定义以下函数:

DROP FUNCTION IF EXISTS lowerword;
SET GLOBAL  log_bin_trust_function_creators=TRUE; 
DELIMITER |
CREATE FUNCTION lowerword( str VARCHAR(128), word VARCHAR(5) )
RETURNS VARCHAR(128)
DETERMINISTIC
BEGIN
  DECLARE i INT DEFAULT 1;
  DECLARE loc INT;

  SET loc = LOCATE(CONCAT(word,' '), str, 2);
  IF loc > 1 THEN
    WHILE i <= LENGTH (str) AND loc <> 0 DO
      SET str = INSERT(str,loc,LENGTH(word),LCASE(word));
      SET i = loc+LENGTH(word);
      SET loc = LOCATE(CONCAT(word,' '), str, i);
    END WHILE;
  END IF;
  RETURN str;
END;
|
DELIMITER ;

这将降低str中所有出现的单词.

然后定义此修改后的正确函数:

DROP FUNCTION IF EXISTS tcase; 
SET GLOBAL  log_bin_trust_function_creators=TRUE; 
DELIMITER | 
CREATE FUNCTION tcase( str VARCHAR(128) ) 
RETURNS VARCHAR(128)
DETERMINISTIC
BEGIN 
  DECLARE c CHAR(1); 
  DECLARE s VARCHAR(128); 
  DECLARE i INT DEFAULT 1; 
  DECLARE bool INT DEFAULT 1; 
  DECLARE punct CHAR(17) DEFAULT ' ()[]{},.-_!@;:?/'; 
  SET s = LCASE( str ); 
  WHILE i <= LENGTH( str ) DO
    BEGIN 
      SET c = SUBSTRING( s, i, 1 ); 
      IF LOCATE( c, punct ) > 0 THEN 
        SET bool = 1; 
      ELSEIF bool=1 THEN  
        BEGIN 
          IF c >= 'a' AND c <= 'z' THEN  
            BEGIN 
              SET s = CONCAT(LEFT(s,i-1),UCASE(c),SUBSTRING(s,i+1)); 
              SET bool = 0; 
            END; 
          ELSEIF c >= '0' AND c <= '9' THEN 
            SET bool = 0; 
          END IF; 
        END; 
      END IF; 
      SET i = i+1; 
    END; 
  END WHILE;

  SET s = lowerword(s, 'A');
  SET s = lowerword(s, 'An');
  SET s = lowerword(s, 'And');
  SET s = lowerword(s, 'As');
  SET s = lowerword(s, 'At');
  SET s = lowerword(s, 'But');
  SET s = lowerword(s, 'By');
  SET s = lowerword(s, 'For');
  SET s = lowerword(s, 'If');
  SET s = lowerword(s, 'In');
  SET s = lowerword(s, 'Of');
  SET s = lowerword(s, 'On');
  SET s = lowerword(s, 'Or');
  SET s = lowerword(s, 'The');
  SET s = lowerword(s, 'To');
  SET s = lowerword(s, 'Via');

  RETURN s; 
END; 
| 
DELIMITER ; 

用法

验证它是否按预期工作:

SELECT tcase(title) FROM table;

用它:

UPDATE table SET title = tcase(title);

资料来源:http://www.artfulsoftware.com/infotree/queries.php？& bw = 1070#122

Answer 2

嗯这样的事可能有用

UPDATE table_name SET `col_name`= CONCAT( UPPER( SUBSTRING( `col_name`, 1, 1 ) ) , LOWER( SUBSTRING( `col_name` FROM 2 ) ) );

Answer 3

如果你需要将自定义首字母缩略词和其他自定义大写模式放入混合中,我已经推广了hobodave的答案:

DELIMITER |
CREATE FUNCTION replaceword( str VARCHAR(128), word VARCHAR(128) )
RETURNS VARCHAR(128)
DETERMINISTIC
BEGIN
  DECLARE loc INT;
  DECLARE punct CHAR(27) DEFAULT ' ()[]{},.-_!@;:?/''"#$%^&*<>'; 
  DECLARE lowerWord VARCHAR(128);
  DECLARE lowerStr VARCHAR(128);

  IF LENGTH(word) = 0 THEN
    RETURN str;
  END IF;
  SET lowerWord = LOWER(word);
  SET lowerStr = LOWER(str);
  SET loc = LOCATE(lowerWord, lowerStr, 1);
  WHILE loc > 0 DO
    IF loc = 1 OR LOCATE(SUBSTRING(str, loc-1, 1), punct) > 0 THEN
      IF loc+LENGTH(word) > LENGTH(str) OR LOCATE(SUBSTRING(str, loc+LENGTH(word), 1), punct) > 0 THEN
        SET str = INSERT(str,loc,LENGTH(word),word);
      END IF;
    END IF;
    SET loc = LOCATE(lowerWord, lowerStr, loc+LENGTH(word));
  END WHILE;
  RETURN str;
END;
|
DELIMITER ;

DELIMITER | 
CREATE FUNCTION tcase( str VARCHAR(128) ) 
RETURNS VARCHAR(128)
DETERMINISTIC
BEGIN 
  DECLARE c CHAR(1); 
  DECLARE s VARCHAR(128); 
  DECLARE i INT DEFAULT 1; 
  DECLARE bool INT DEFAULT 1; 
  DECLARE punct CHAR(27) DEFAULT ' ()[]{},.-_!@;:?/''"#$%^&*<>'; 

  SET s = LCASE( str ); 
  WHILE i <= LENGTH( str ) DO
    BEGIN 
      SET c = SUBSTRING( s, i, 1 ); 
      IF LOCATE( c, punct ) > 0 THEN 
        SET bool = 1; 
      ELSEIF bool=1 THEN  
        BEGIN 
          IF c >= 'a' AND c <= 'z' THEN  
            BEGIN 
              SET s = CONCAT(LEFT(s,i-1),UCASE(c),SUBSTRING(s,i+1)); 
              SET bool = 0; 
            END; 
          ELSEIF c >= '0' AND c <= '9' THEN 
            SET bool = 0; 
          END IF; 
        END; 
      END IF; 
      SET i = i+1; 
    END; 
  END WHILE;

  SET s = replaceword(s, 'a');
  SET s = replaceword(s, 'an');
  SET s = replaceword(s, 'and');
  SET s = replaceword(s, 'as');
  SET s = replaceword(s, 'at');
  SET s = replaceword(s, 'but');
  SET s = replaceword(s, 'by');
  SET s = replaceword(s, 'for');
  SET s = replaceword(s, 'if');
  SET s = replaceword(s, 'in');
  SET s = replaceword(s, 'n');
  SET s = replaceword(s, 'of');
  SET s = replaceword(s, 'on');
  SET s = replaceword(s, 'or');
  SET s = replaceword(s, 'the');
  SET s = replaceword(s, 'to');
  SET s = replaceword(s, 'via');

  SET s = replaceword(s, 'RSS');
  SET s = replaceword(s, 'URL');
  SET s = replaceword(s, 'PHP');
  SET s = replaceword(s, 'SQL');
  SET s = replaceword(s, 'OPML');
  SET s = replaceword(s, 'DHTML');
  SET s = replaceword(s, 'CSV');
  SET s = replaceword(s, 'iCal');
  SET s = replaceword(s, 'XML');
  SET s = replaceword(s, 'PDF');

  SET c = SUBSTRING( s, 1, 1 ); 
  IF c >= 'a' AND c <= 'z' THEN  
      SET s = CONCAT(UCASE(c),SUBSTRING(s,2)); 
  END IF; 

  RETURN s; 
END; 
| 
DELIMITER ;

本质上,它由一个不区分大小写的单词替换函数和一个大写每个单词的第一个字母并对特定单词执行某些变换的函数组成.

希望它对某人有帮助.

Answer 4

我的简单适当案例的解决方案：

CREATE FUNCTION `proper_case`(str varchar(128)) RETURNS varchar(128)
BEGIN
DECLARE n, pos INT DEFAULT 1;
DECLARE sub, proper VARCHAR(128) DEFAULT '';

if length(trim(str)) > 0 then
    WHILE pos > 0 DO
        set pos = locate(' ',trim(str),n);
        if pos = 0 then
            set sub = lower(trim(substr(trim(str),n)));
        else
            set sub = lower(trim(substr(trim(str),n,pos-n)));
        end if;

        set proper = concat_ws(' ', proper, concat(upper(left(sub,1)),substr(sub,2)));
        set n = pos + 1;
    END WHILE;
end if;

RETURN trim(proper);
END

将其用作：

SELECT proper_case("JOHN DOE");

输出：

John Doe

Answer 5

我用过这样的东西

UPDATE `tablename` 
SET `fieldname` =  CONCAT(UCASE(SUBSTRING(`fieldname`,1,1)),'', LCASE(SUBSTRING(`fieldname`,2,LENGTH(`fieldname`)))) 

注意：这只会将第一个字符转换为大写。和其余的值小写。

Answer 6

哇！我对 SQL 一点也不熟练；这是对我有用的方法：

1. 将表导出为 .sql 格式的文本文件。
2. 在Textmate中打开文件（我已经方便使用了）。
3. 选择包含大写数据的行。
4. 从“文本”菜单中选择“转换”，然后选择“转为标题大写”。

5. 查找并替换以下各项的每个实例：

   INSERT INTO `Table` (`Col1`, `Col2`, `Etc`, ...) VALUES
   

   具有正确的小写值。

6. 将表导入回数据库。
7. 用于UPDATE table SET colname=LOWER(colname);重置应为小写的列的小写值。

我之前没有尝试使用 Textmate 的原因是我无法弄清楚如何在不破坏其他数据的情况下将单个列转换为标题大小写，但这种方法似乎有效。感谢您的指导和支持！