35

我有一个现有的表'people_table'，带有一个字段full_name。

许多记录的“full_name”字段填充了不正确的大小写。例如'fred Jones'或'fred jones'或'Fred jones'。

我可以找到这些错误的条目：

SELECT * FROM people_table WHERE full_name REGEXP BINARY '^[a-z]';

如何将找到的每个单词的第一个字母大写？例如'fred jones'变成'Fred Jones'.

4

13 回答 13

66

没有 MySQL 函数可以做到这一点，你必须自己编写。在以下链接中有一个实现：

http://joezack.com/index.php/2008/10/20/mysql-capitalize-function/

为了使用它，首先您需要在数据库中创建函数。例如，您可以使用 MySQL Query Browser（右键单击数据库名称并选择 Create new Function）来执行此操作。

创建函数后，您可以使用如下查询更新表中的值：

UPDATE users SET name = CAP_FIRST(name);
于 2010-07-19T03:10:37.200 回答
47

如果你只需要运行一次，并且不想创建一个函数，你可以做一些真正被编码的事情：

UPDATE people_table SET full_name = LOWER(full_name);
UPDATE people_table SET full_name = CONCAT(UPPER(SUBSTR(full_name,1,1)),LOWER(SUBSTR(full_name,2)));
UPDATE people_table SET full_name = REPLACE(full_name,' a',' A');
UPDATE people_table SET full_name = REPLACE(full_name,' b',' B');
UPDATE people_table SET full_name = REPLACE(full_name,' c',' C');
UPDATE people_table SET full_name = REPLACE(full_name,' d',' D');
UPDATE people_table SET full_name = REPLACE(full_name,' e',' E');
UPDATE people_table SET full_name = REPLACE(full_name,' f',' F');
UPDATE people_table SET full_name = REPLACE(full_name,' g',' G');
UPDATE people_table SET full_name = REPLACE(full_name,' h',' H');
UPDATE people_table SET full_name = REPLACE(full_name,' i',' I');
UPDATE people_table SET full_name = REPLACE(full_name,' j',' J');
UPDATE people_table SET full_name = REPLACE(full_name,' k',' K');
UPDATE people_table SET full_name = REPLACE(full_name,' l',' L');
UPDATE people_table SET full_name = REPLACE(full_name,' m',' M');
UPDATE people_table SET full_name = REPLACE(full_name,' n',' N');
UPDATE people_table SET full_name = REPLACE(full_name,' o',' O');
UPDATE people_table SET full_name = REPLACE(full_name,' p',' P');
UPDATE people_table SET full_name = REPLACE(full_name,' q',' Q');
UPDATE people_table SET full_name = REPLACE(full_name,' r',' R');
UPDATE people_table SET full_name = REPLACE(full_name,' s',' S');
UPDATE people_table SET full_name = REPLACE(full_name,' t',' T');
UPDATE people_table SET full_name = REPLACE(full_name,' u',' U');
UPDATE people_table SET full_name = REPLACE(full_name,' v',' V');
UPDATE people_table SET full_name = REPLACE(full_name,' w',' W');
UPDATE people_table SET full_name = REPLACE(full_name,' x',' X');
UPDATE people_table SET full_name = REPLACE(full_name,' y',' Y');
UPDATE people_table SET full_name = REPLACE(full_name,' z',' Z');
于 2015-11-02T20:38:51.597 回答
18

如果您想将所有单词大写，则需要调用自定义函数。

-- may help:
-- DROP function if exists capitalize;

DELIMITER $$
CREATE FUNCTION `capitalize`(s varchar(255)) RETURNS varchar(255) 
BEGIN
  declare c int;
  declare x varchar(255);
  declare y varchar(255);
  declare z varchar(255);

  set x = UPPER( SUBSTRING( s, 1, 1));
  set y = SUBSTR( s, 2);
  set c = instr( y, ' ');

  while c > 0
    do
      set z = SUBSTR( y, 1, c);
      set x = CONCAT( x, z);
      set z = UPPER( SUBSTR( y, c+1, 1));
      set x = CONCAT( x, z);
      set y = SUBSTR( y, c+2);
      set c = INSTR( y, ' ');     
  end while;
  set x = CONCAT(x, y);
  return x;
END$$

DELIMITER ;

现在你这样做：

 UPDATE mytable SET thefield = capitalize(thefield);
于 2014-04-08T16:10:20.243 回答
5

这是 Nicholas Thompson 的两个有用的函数。您可以将 UC_DELEMITER 的第 3 个变量设置为 false，将第二个变量设置为“”，以实现多个单词的大写。

UC_FIRST 将 任何给定的字符串大写 - 此函数是 PHP 中 ucfirst 函数的克隆。

DROP FUNCTION IF EXISTS UC_FIRST;
CREATE FUNCTION UC_FIRST(oldWord VARCHAR(255)) RETURNS VARCHAR(255)
RETURN CONCAT(UCASE(SUBSTRING(oldWord, 1, 1)),SUBSTRING(oldWord, 2));

UC_DELIMITER 大写，单词之间有分隔符

DROP FUNCTION IF EXISTS UC_DELIMITER;
DELIMITER //
CREATE FUNCTION UC_DELIMITER(
   oldName VARCHAR(255), delim VARCHAR(1), trimSpaces BOOL
) 
  RETURNS VARCHAR(255)
BEGIN
SET @oldString := oldName;
SET @newString := "";

tokenLoop: LOOP
    IF trimSpaces THEN SET @oldString := TRIM(BOTH " " FROM @oldString);          END IF;

SET @splitPoint := LOCATE(delim, @oldString);

IF @splitPoint = 0 THEN
  SET @newString := CONCAT(@newString, UC_FIRST(@oldString));
  LEAVE tokenLoop;
END IF;

   SET @newString := CONCAT(@newString, UC_FIRST(SUBSTRING(@oldString, 1, @splitPoint)));
   SET @oldString := SUBSTRING(@oldString, @splitPoint+1);
END LOOP tokenLoop;

RETURN @newString;
END//
DELIMITER ;

例子：

SELECT UC_DELIMITER('eric-leroy','-',TRUE);
Eric-Leroy

功能网页

于 2015-11-28T20:21:04.483 回答
4

我尝试了上面的代码，但函数有语法错误，所以无法创建它。如果对任何人有帮助，请为最新版本的 MySQL 编写此内容

CREATE FUNCTION  `CAP_FIRST`(input VARCHAR(255)) RETURNS varchar(255) CHARSET latin1
    DETERMINISTIC
BEGIN
    DECLARE len INT;
    DECLARE i INT;
    DECLARE charnum INT;
    declare SortedName varchar(255);

    SET len   = CHAR_LENGTH(input);
    SET input = LOWER(input);
    SET i = 1;
    set charnum = 1;
    set SortedName = '';


    WHILE (i <= len) DO
        if charnum = 1 then
            set SortedName = concat(SortedName,upper(mid(input,i,1)));
            set charnum = charnum + 1;
        else
            if mid(input,i,1) = ' ' then
                set SortedName = concat(SortedName,' ');
                set charnum = 1;
            else
                set SortedName = concat(SortedName,mid(input,i,1));
                set charnum = charnum + 1;
            end if;

        end if;


        SET i = i + 1;
    END WHILE;

    RETURN SortedName;
END
于 2014-10-31T10:58:06.267 回答
4 

DELIMITER $$
CREATE FUNCTION `capitalize`(s varchar(255)) RETURNS varchar(255) 
BEGIN
  declare c int;
  declare x varchar(255);
  declare y varchar(255);
  declare z varchar(255);

  set x = UPPER( SUBSTRING( s, 1, 1));
  set y = lower(SUBSTR( s, 2));
  set c = instr( y, ' ');

  while c > 0
    do
      set z = SUBSTR( y, 1, c);
      set x = CONCAT( x, z);
      set z = UPPER( SUBSTR( y, c+1, 1));
      set x = CONCAT( x, z);
      set y = SUBSTR( y, c+2);
      set c = INSTR( y, ' ');     
  end while;
  set x = CONCAT(x, y);
  return x;
END$$

DELIMITER ;

Create above function to set First character to capital of each words

于 2017-06-21T12:28:54.203 回答
2

简单地 ：

SELECT
CONCAT(UCASE(LEFT(firstname, 1)), LCASE(SUBSTRING(firstname, 2))) as firstname
FROM PEOPLE
于 2019-02-08T16:49:40.953 回答
0

如果它是一个计时器，则无需创建函数。以下工作正常：

-- Capitalize first letter of each word in r.name field
SELECT TRIM(CONCAT(
   CONCAT(UPPER(SUBSTRING(cname1,1,1)),SUBSTRING(cname1,2)) , " ",
   CONCAT(UPPER(SUBSTRING(cname2,1,1)),SUBSTRING(cname2,2)) , " ",
   CONCAT(UPPER(SUBSTRING(cname3,1,1)),SUBSTRING(cname3,2))))
FROM (
   SELECT
     @num_spaces := 1 + LENGTH(c_name) - LENGTH(REPLACE(c_name, ' ', '')) AS 
     num_spaces,
     SUBSTRING_INDEX(CONVERT(c_name,CHAR), ' ', 1) AS cname1,
     IF(@num_spaces > 1, SUBSTRING_INDEX(SUBSTRING_INDEX(c_name, ' ', 2), ' ', -1), '') AS cname2,
     IF(@num_spaces > 2, SUBSTRING_INDEX(SUBSTRING_INDEX(c_name, ' ', 3), ' ', -1), '') AS cname3
     FROM (SELECT (CASE 
        WHEN UPPER(r.name)COLLATE latin1_general_cs =r.name THEN LOWER(TRIM(r.name))
        ELSE TRIM(r.name)
        END) AS c_name,r.name
        FROM table r) cr) ncr;

注意： IF 子句应该等于或大于@num_spaces 的值。当前的 sql 将处理最多 3 个单词。如果需要，您可以添加更多。

于 2019-07-30T13:51:35.357 回答
0

首先创建一个函数

DROP FUNCTION IF EXISTS UC_FIRST;
CREATE FUNCTION UC_FIRST(oldWord VARCHAR(255)) RETURNS VARCHAR(255) 
RETURN CONCAT(UCASE(SUBSTRING(oldWord, 1, 1)),SUBSTRING(oldWord, 2));

然后使用这个查询

UPDATE mytable SET thefield = UC_FIRST(thefield);
于 2020-07-14T11:16:38.723 回答
0

Eric Leroy 的回答是这里最有趣的回答，但它遗漏了两件事：

  • UC_FIRST 函数中的小写：如果要将单词的第一个字母大写，则表示您也希望其他字母为小写。它适用于完整的小写条目，但如果在条目中遇到混合大小写，例如«wOrD»，当您想要«Word»时，您会得到«WOrD»。
  • 根据 mysql 版本和配置，您可能需要函数定义中的确定性关键字。

这是创建函数的更新代码：

DROP FUNCTION IF EXISTS UC_FIRST;
CREATE FUNCTION UC_FIRST(oldWord VARCHAR(255)) RETURNS VARCHAR(255) DETERMINISTIC
RETURN CONCAT(UCASE(SUBSTRING(oldWord, 1, 1)),LCASE(SUBSTRING(oldWord, 2)));

DROP FUNCTION IF EXISTS UC_DELIMITER;
DELIMITER //
CREATE FUNCTION UC_DELIMITER(
   oldName VARCHAR(255), delim VARCHAR(1), trimSpaces BOOL
) 
  RETURNS VARCHAR(255) DETERMINISTIC
BEGIN
SET @oldString := oldName;
SET @newString := "";

tokenLoop: LOOP
    IF trimSpaces THEN SET @oldString := TRIM(BOTH " " FROM @oldString);          END IF;

SET @splitPoint := LOCATE(delim, @oldString);

IF @splitPoint = 0 THEN
  SET @newString := CONCAT(@newString, UC_FIRST(@oldString));
  LEAVE tokenLoop;
END IF;

   SET @newString := CONCAT(@newString, UC_FIRST(SUBSTRING(@oldString, 1, @splitPoint)));
   SET @oldString := SUBSTRING(@oldString, @splitPoint+1);
END LOOP tokenLoop;

RETURN @newString;
END//
DELIMITER ;

有以下要求：

SELECT UC_DELIMITER('ThIs IS an ExAMplE oF MIxeD CaseS sTRing',' ',TRUE);

你会得到：

This Is An Example Of Mixed Cases String
于 2021-05-05T10:51:39.327 回答
-1

在 phpmyadmin 上，UPDATE table_name SET Column_Name = LOWER(Column_Name) 然后在显示数据库表中数据的 html 页面中运行它，使用 csstext-transform: capitalize;

于 2016-09-04T11:50:47.340 回答
-1

Excel（或谷歌表格）中的正确功能完全符合您的要求。

因此，将您的 mysql 表导出为 CSV 并导出到 Excel（或谷歌表格）中。然后使用 将= Proper(*text_to_capitalize*)每个单词的首字母大写。

然后只需将该 Excel 表作为 CSV 导出回您的数据库。

于 2017-02-16T18:11:23.413 回答
-1

如果您使用的是 PHP，那么...

try{
  $con = new PDO("mysql:host=localhost;dbname=dbasename", "root", "");
}
catch(PDOException $e){
  echo "error" . $e-getMessage();
}

$select = $con->prepare("SELECT * FROM table");
$select->setFetchMode(PDO::FETCH_ASSOC);
$select->execute();

while($data=$select->fetch()) {

  $id = $data['id'];
  $column = $data['column'];
  $column = ucwords(strtolower($column)); // Capitalize each word

  $update = $con->prepare("UPDATE table SET column=:column WHERE id='$id'");
  $update->bindParam(':column', $column);
  $update->execute();
}
于 2017-04-04T01:38:42.693 回答