Question

我的表有一个名为name的列，包含camelCase格式的人名，但是当找到大写字母时，我需要选择一个空格分隔的名称：例如，我的表格如下：

|name          |
----------------
| JosephJackson|
|AidenChase    |
|LukeBenjamin  |

但我希望以这种方式：

 |name          |
 ----------------
 | Joseph Jackson|
 |Aiden Chase    |
 |Luke Benjamin  |

我该如何使用我的SELECT？感谢

Answer 1

＆＃13;

BEGIN
SET @text = word;
SET @result = "";
SET @i = 1;
WHILE @i <= LENGTH(@text) DO
SET @t = SUBSTRING(@text, @i, 1);
IF @i > 1 AND ASCII(SUBSTRING(@text, @i, 1)) BETWEEN 65 AND 90  OR @t ='_' OR @t = '-' THEN
IF @t <> '_' AND @t <> '-' THEN
SET @result = CONCAT(@result,' ');
END IF;
END IF;
IF @t <> '_' AND @t <> '-' THEN
SET @result = CONCAT(@result , @t);
end IF;
SET @i = @i + 1;
END WHILE;
RETURN @result;
END

＆＃13;

上面的sql函数会将文本从驼峰大小写中分离出来，如果在该文本中使用它们，也会从下划线（_）和短划线（ - ）等特殊字符中分离出来。

Answer 2

我根据@ Mahesh的答案改编了我想要完成的事情（个人喜好）：

将第一个字符设为大写
制作-和_个字符
句柄缩写
用小写字母替换小字

这是两者的比较。

<强>矿：

SELECT camelCaseToSpaced('iWasUsingThisForSetting-name-conversionForTheACMECo_project');

...输出

I Was Using This for Setting name conversion for the ACME Co project

Mahesh的版本

SELECT camelCaseToSpacedMahesh('iWasUsingThisForSetting-name-conversionForTheACMECo_project');

...输出

i Was Using This For Settingnameconversion For The A C M E Coproject

所以这里我的代码：

CREATE FUNCTION camelCaseToSpaced(string VARCHAR(100)) RETURNS VARCHAR(255)
  BEGIN
    SET @text = string;
    SET @result = "";
    SET @i = 1;
    SET @caps = 0;

    WHILE @i <= LENGTH(@text) DO
      SET @t = SUBSTRING(@text, @i, 1);
      SET @lastCaps = @caps;
      SET @caps = 0;
      -- uppers or _ or -
      IF @i > 1 AND ASCII(SUBSTRING(@text, @i, 1)) BETWEEN 65 AND 90 OR @t ='_' OR @t = '-' THEN
        IF NOT (@t ='_' OR @t = '-') THEN
          set @caps = 1;
        ELSE
          set @caps = 0;
        END IF;
        IF @i < LENGTH(@text) THEN
          set @nextAscii = ASCII(SUBSTRING(@text, @i+1, 1));
        END IF;
        SET @sep = ' ';
        -- to not have no space separator we need:
        -- 1. previous char is cap
        -- 2. next ascii is cap
        IF (@lastCaps = 1 AND @nextAscii BETWEEN 65 AND 90) THEN
          SET @sep = '';
        END IF;
        SET @result = CONCAT(@result, @sep);
      END IF;
      -- all characters except _ and -
      IF @t <> '_' AND @t <> '-' THEN
        -- make first character uppercase
        IF @i = 1 THEN
          SET @t = UPPER(@t);
        END IF;
        SET @result = CONCAT(@result , @t);
      end IF;
      SET @i = @i + 1;
    END WHILE;

    SET @result = replace(@result, ' The ', ' the ');
    SET @result = replace(@result, ' As ', ' as ');
    SET @result = replace(@result, ' In ', ' in ');
    SET @result = replace(@result, ' To ', ' to ');
    SET @result = replace(@result, ' On ', ' on ');
    SET @result = replace(@result, ' Of ', ' of ');
    SET @result = replace(@result, ' For ', ' for ');

    RETURN @result;
  END;

Answer 3

我对@MaheshYadav代码做了一些修饰和更新。这样会将camelCase字符串更改为大写。

DELIMITER @@

DROP FUNCTION IF EXISTS change_case @@
CREATE FUNCTION change_case (word CHAR(255)) RETURNS VARCHAR(255)
COMMENT 'Change the case to Proper Case, 65-90 (decimal|ASCII) are A-Z, but if first char in between 97-122 than change case to upper' DETERMINISTIC
BEGIN
  SET @text = word;
  SET @result = "";
  SET @i = 1;
  IF ASCII(SUBSTRING(@text, 1, 1)) BETWEEN 97 AND 122 THEN
    SET @text = CONCAT(UPPER(SUBSTRING(@text, 1, 1)), SUBSTRING(@text, 2));
  END IF;
  WHILE @i <= LENGTH(@text) DO
    SET @t = SUBSTRING(@text, @i, 1);
    IF @i > 1 AND ASCII(SUBSTRING(@text, @i, 1)) BETWEEN 65 AND 90  OR @t ='_' OR @t = '-' THEN
      IF @t <> '_' AND @t <> '-' THEN
        SET @result = CONCAT(@result,' ');
      END IF;
    END IF;
    IF @t <> '_' AND @t <> '-' THEN
      SET @result = CONCAT(@result , @t);
    END IF;
    SET @i = @i + 1;
  END WHILE;
  RETURN @result;
END @@

DELIMITER ;

示例用法：

UPDATE users SET `name` = change_case(userName);

Mysql - 找到camelcase时的拆分结果

3 个答案: