我有一个MySQL表格,其中一个列的所有数据都是大写输入的,但我需要将其转换为Title Case(每个单词首字母大写),并识别类似于Daring Fireball Title Case script中的“小单词”。
我在这个优秀的解决方案中找到了将字符串转换为小写字母的方法,但是我的MySQL版本好像没有包含Title Case函数。是否有一种优雅的方式来完成这个任务?
我有一个MySQL表格,其中一个列的所有数据都是大写输入的,但我需要将其转换为Title Case(每个单词首字母大写),并识别类似于Daring Fireball Title Case script中的“小单词”。
我在这个优秀的解决方案中找到了将字符串转换为小写字母的方法,但是我的MySQL版本好像没有包含Title Case函数。是否有一种优雅的方式来完成这个任务?
编辑
哇!这是我写的第一个 SQL 函数。没有提供任何保证,请在使用前备份数据。:)
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 ;
这将会把字符串中所有出现的单词转换为小写。
然后定义这个修改后的合适函数:
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;
使用它:
UPDATE table SET title = tcase(title);
来源: http://www.artfulsoftware.com/infotree/queries.php?&bw=1070#122
嗯,类似这样可能有效
UPDATE table_name SET `col_name`= CONCAT( UPPER( SUBSTRING( `col_name`, 1, 1 ) ) , LOWER( SUBSTRING( `col_name` FROM 2 ) ) );
如果你需要将自定义的缩写词和其他自定义的大写字母模式混合在一起,我将hobodave的答案进行了泛化:
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 ;
基本上,它包含一个不区分大小写的单词替换函数和一个将每个单词的首字母大写并对特定单词执行一些转换的函数。
希望对某人有帮助。
我之前使用了类似这样的东西
UPDATE `tablename`
SET `fieldname` = CONCAT(UCASE(SUBSTRING(`fieldname`,1,1)),'', LCASE(SUBSTRING(`fieldname`,2,LENGTH(`fieldname`))))
我提供的简单适用的解决方案:
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
使用方法:
SELECT proper_case("JOHN DOE");
输出:
John Doe
这对我来说在我的MySQL 5.0中是有效的。
DELIMITER |
CREATE FUNCTION CamelCase(str VARCHAR(8000))
RETURNS VARCHAR(8000)
BEGIN
DECLARE result VARCHAR(8000);
SET str = CONCAT(' ',str,' ');
SET result = '';
WHILE LENGTH(str) > 1 DO
SET str = SUBSTR(str,INSTR(str,' ')+1,LENGTH(str));
SET result = CONCAT(result,UPPER(LEFT(str,1)), LOWER(SUBSTR(str,2,INSTR(str,' ') - 1)) ) ;
SET str = SUBSTR(str,INSTR(str,' '),LENGTH(str));
END WHILE;
RETURN result;
END
|
DELIMITER ;
UPDATE `suburbs`
SET title2 = CONCAT_WS(' ',
CONCAT(UPPER(LEFT(SUBSTRING_INDEX(title, ' ',1),1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',1),2))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',2),LENGTH(SUBSTRING_INDEX(title, ' ',1)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',2),3 + LENGTH(SUBSTRING_INDEX(title, ' ',1))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',3),LENGTH(SUBSTRING_INDEX(title, ' ',2)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',3),3 + LENGTH(SUBSTRING_INDEX(title, ' ',2))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',4),LENGTH(SUBSTRING_INDEX(title, ' ',3)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',4),3 + LENGTH(SUBSTRING_INDEX(title, ' ',3))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',5),LENGTH(SUBSTRING_INDEX(title, ' ',4)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',5),3 + LENGTH(SUBSTRING_INDEX(title, ' ',4))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',6),LENGTH(SUBSTRING_INDEX(title, ' ',5)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',6),3 + LENGTH(SUBSTRING_INDEX(title, ' ',5))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',7),LENGTH(SUBSTRING_INDEX(title, ' ',6)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',7),3 + LENGTH(SUBSTRING_INDEX(title, ' ',6))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',8),LENGTH(SUBSTRING_INDEX(title, ' ',7)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',8),3 + LENGTH(SUBSTRING_INDEX(title, ' ',7))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',9),LENGTH(SUBSTRING_INDEX(title, ' ',8)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',9),3 + LENGTH(SUBSTRING_INDEX(title, ' ',8))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',10),LENGTH(SUBSTRING_INDEX(title, ' ',9)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',10),3 + LENGTH(SUBSTRING_INDEX(title, ' ',9))))),
CONCAT(UPPER(MID(SUBSTRING_INDEX(title, ' ',11),LENGTH(SUBSTRING_INDEX(title, ' ',10)) + 2, 1)), LOWER(MID(SUBSTRING_INDEX(title, ' ',11),3 + LENGTH(SUBSTRING_INDEX(title, ' ',10))))))
WHERE 1
哇!我对SQL一点也不熟练;这是对我有效的方法:
查找并替换每个实例:
INSERT INTO `Table` (`Col1`, `Col2`, `Etc`, ...) VALUES
使用正确的小写值进行替换。
UPDATE table SET colname=LOWER(colname);
重置应为小写的列的小写值。我将Customer_Name存储为大写字母。例如:MUHAMMED MACINTYRE
我需要以标题/正确格式返回它。例如:Muhammed Macintyre
我在MySql中使用了以下代码。
SELECT Customer_Name,
concat(substring(upper(Customer_Name),1,1),
lower(substring((substring_index(Customer_Name, ' ', 1)), 2, length(Customer_Name))),
' ' ,
upper(substring(substring_index(Customer_Name, ' ', -1),1,1)),
lower(substring(substring_index(Customer_Name, ' ', -1),2,length(Customer_Name)))
) as Customer_Name_TitleCase
FROM customer_table ;
你可以使用concat()、substring()和length()来实现,但我只能看到它适用于一个单词。你的应用程序代码为什么不能处理这个问题,而非使用mysql?