How to avoid mysql injections using PDO

Question

How can I avoid mysql injections? This is the PHP file I have right now

<?php
include 'config.php';

$Name = $_GET['Name'] ;

$sql = "Select * from tables where names =\"$Name\"";



try {
    $dbh = new PDO("mysql:host=$dbhost;dbname=$dbname", $dbuser, $dbpass);
    $dbh->query('SET CHARACTER SET utf8');
    $dbh->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $stmt = $dbh->query($sql);  
    $names = $stmt->fetchAll(PDO::FETCH_OBJ);
    $dbh = null;
    echo '{"key":'. json_encode($names) .'}'; 
} catch(PDOException $e) {
    echo '{"error":{"text":'. $e->getMessage() .'}}'; 
}


?>

When I put $stmt = $dbh->query($sql); $stmt->execute(array(':name' => $name)); to the code it doesn't work. So how should I do it?

possible duplicate of Best way to prevent SQL Injection in PHP — eggyal
– eggyal, Commented Jun 7, 2012 at 9:30

Dmitry Kudryavtsev · Accepted Answer · 2012-06-07 09:27:43Z

6

Read about pdo prepared statements

Here is an example

$stmt = $dbh->prepare("SELECT * FROM tables WHERE names = :name");
$stmt->execute(array(':name' => $name));

answered Jun 7, 2012 at 9:27

Dmitry Kudryavtsev

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2 Comments

Pekka Over a year ago

This is very important and oft misunderstood: just using PDO doesn't protect you from SQL injection. Only parametrized queries like the one above do.

adeel iqbal Over a year ago

@skwee stackoverflow.com/questions/5741187/… says that only PDO prepared statements can't prevent injection. take a look at this.

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