Mysql QUOTE() function ~ Tech Blog

Mysql QUOTE() function

MySQL QUOTE() produces a string which is a properly escaped data value in an SQL statement, out of a user supplied by the string as an argument.

The function achieves this by enclosing the string with single quotes, and by preceding each single quote, backslash, ASCII NUL and control-Z with a backslash.

If the string passed as argument is NULL, the function returns a word NULL.

Syntax:

QUOTE(str)

Argument

Name	Description
str	A string.

MySQL Version: 5.6

Example of MySQL QUOTE() function

The following MySQL statement returns a string 'w3re\'source'.

Code:

SELECT QUOTE('w3re''source');



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Sample Output:

mysql> SELECT QUOTE('w3re''source');
+-----------------------+
| QUOTE('w3re''source') |
+-----------------------+
| 'w3re\'source'        | 
+-----------------------+
1 row in set (0.03 sec)

Example of MySQL QUOTE() function using table

The following statement returns the pub_name and pub_name enclosed with a single quote for those publishers who belong to the ‘USA’.

Code:

SELECT pub_name, QUOTE(pub_name)
FROM publisher 
WHERE country='USA'; 



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Sample table: publisher

Sample Output:

mysql> SELECT pub_name, QUOTE(pub_name)
    -> FROM publisher 
    -> WHERE country='USA'; 
+--------------------------+----------------------------+
| pub_name                 | QUOTE(pub_name)            |
+--------------------------+----------------------------+
| Jex Max Publication      | 'Jex Max Publication'      | 
| Mountain Publication     | 'Mountain Publication'     | 
| Summer Night Publication | 'Summer Night Publication' | 
+--------------------------+----------------------------+
3 rows in set (0.04 sec)

PHP script

<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>example-quote-function - php mysql examples | w3resource</title>
<meta name="description" content="example-quote-function - php mysql examples | w3resource">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
</head>
<body>
<div class="container">
<div class="row">
<div class="col-md-12">
<h2>A list of Publishers those who belong to USA. Right column shows the name of the publisher enclosed with single quotes:</h2>
<table class='table table-bordered'>
<tr>
<th>Publishers</th><th>QUOTE(pub_name)</th>
</tr>
<?php
$hostname="your_hostname";
$username="your_username";
$password="your_password";
$db = "your_dbname";
$dbh = new PDO("mysql:host=$hostname;dbname=$db", $username, $password);
foreach($dbh->query('SELECT pub_name, QUOTE(pub_name)
FROM publisher
WHERE country="USA"') as $row) {
echo "<tr>";
echo "<td>" . $row['pub_name'] . "</td>";
echo "<td>" . $row['QUOTE(pub_name)'] . "</td>";
echo "</tr>";
}
?>
</tbody></table>
</div>
</div>
</div>
</body>
</html>



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Tech Blog

Tuesday 10 July 2018