问题
I have an existing table \'people_table\', with a field full_name.
Many records have the \'full_name\' field populated with incorrect casing. e.g. \'fred Jones\' or \'fred jones\' or \'Fred jones\'.
I can find these errant entries with:
SELECT * FROM people_table WHERE full_name REGEXP BINARY \'^[a-z]\';
How can I capitalize the first letter of each word found? e.g. \'fred jones\' becomes \'Fred Jones\'.
回答1:
There's no MySQL function to do that, you have to write your own. In the following link there's an implementation:
http://joezack.com/index.php/2008/10/20/mysql-capitalize-function/
In order to use it, first you need to create the function in the database. You can do this, for example, using MySQL Query Browser (right-click the database name and select Create new Function).
After creating the function, you can update the values in the table with a query like this:
UPDATE users SET name = CAP_FIRST(name);
回答2:
If you need to run it just one time, and you don't want to create a function, you can do something really-harcoded as:
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');
回答3:
If you want to capitalize all words, it will be needed to invoke a custom function.
-- 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 ;
Now you do this way:
UPDATE mytable SET thefield = capitalize(thefield);
回答4:
I tried the code from above but had syntax errors on function, so could not create it. Wrote this for latest version of MySQL if it helps anyone
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
回答5:
Here are two useful functions by Nicholas Thompson. You can set the 3rd variable of UC_DELEMITER to false, and the second to " " for the capitalization of more than one word.
UC_FIRST Capitalize any given string - This function is a clone of the ucfirst function in PHP.
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 Capitalize with a delimiter in between words
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 ;
Examples:
SELECT UC_DELIMITER('eric-leroy','-',TRUE);
Eric-Leroy
Function's Webpage
回答6:
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回答7:
The Proper function in Excel (or google sheets does exactly what you want.
So, export your mysql table as CSV and into Excel (or google sheets). Then use the = Proper(*text_to_capitalize*) to capitalize the first letter of each word.
Then just export that excel sheet as CSV back into your database.
回答8:
If you are using PHP then...
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();
}
回答9:
Simply :
SELECT
CONCAT(UCASE(LEFT(firstname, 1)), LCASE(SUBSTRING(firstname, 2))) as firstname
FROM PEOPLE
回答10:
No need for creating a function if it is a one timer. The below works just fine:
-- 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;
NOTE: The IF clause should be equal to or more than the value of @num_spaces. The current sql will take care of at max 3 words. You may add more if required.
回答11:
on phpmyadmin, run this UPDATE table_name SET Column_Name = LOWER(Column_Name)
then in the html page that displays the data from the database table use css text-transform: capitalize;
来源：https://stackoverflow.com/questions/3278207/mysql-capitalize-first-letter-of-each-word-in-existing-table