mysql - SQL InitCap表示一些特殊单词大写

Question

如何修改此 InitCap 函数，使其在字符串末尾且前面有空格时始终为大写 AB。

• 测试 Ab <-- 应显示 AB
• testab <-- 应显示 ab

• abtest <-- 应该显示 ab

  分隔符$$

  DROP FUNCTION IF EXISTS `CapitializeFirstCharInEveryWord`$$
  
  CREATE FUNCTION `CapitializeFirstCharInEveryWord`(x char(100)) RETURNS char(100) CHARSET utf8
  BEGIN
  SET @str='';
  SET @l_str='';
  WHILE x REGEXP ' ' DO
  SELECT SUBSTRING_INDEX(x, ' ', 1) INTO @l_str;
  SELECT SUBSTRING(x, LOCATE(' ', x)+1) INTO x;
  SELECT CONCAT(@str, ' ', CONCAT(UPPER(SUBSTRING(@l_str,1,1)),LOWER(SUBSTRING(@l_str,2)))) INTO @str;
  END WHILE;
  RETURN LTRIM(CONCAT(@str, ' ', CONCAT(UPPER(SUBSTRING(x,1,1)),LOWER(SUBSTRING(x,2)))));
  END$$
  

Answer 1

您想将字符串中的最后一个单词大写吗？你可以用简单的方式做到这一点。评论中的说明。

CREATE FUNCTION `CapitalizeLastWord`(x char(100)) RETURNS char(100) CHARSET utf8
BEGIN
-- detect has x space
SET @space_pos_reverse = LOCATE(' ', REVERSE(x)); 

-- if not return unchanged x
IF @space_pos_reverse = 0 THEN RETURN x; 
END IF;

-- getting last space position
SET @last_space_pos = LENGTH(x)-@space_pos_reverse+1; 

-- split x to 2 parts, 2nd part gettin UPPER
RETURN CONCAT(SUBSTRING(x, 1, @last_space_pos), UPPER(SUBSTRING(x, @last_space_pos+1)) ); 

END$$