PDO 準備語句如何增強網站安全性並防止 SQL 注入？

Understanding SQL Injections in ADOdb and General Website Security

SQL injections occur when user input is improperly encoded, potentially compromising website security. While commonly associated with POST and GET methods, such attacks can occur in various scenarios.

Examples of SQL Injections

Consider the provided code with POST method:

$name     = trim($_POST['username']);
$mail     = trim($_POST['email']);
$password = trim($_POST['password ']);

if ($errors == "false") {
    $sql =
        "INSERT INTO
           clients
         SET
           name='" . mysql_real_escape_string($name) . "',
           mail='" . mysql_real_escape_string($mail) . "', 
           password='" . mysql_real_escape_string(sha1($password)) . "'";
           $connection->execute($sql);
        
}

This code uses mysql_real_escape_string to escape user inputs, preventing SQL injections.

Now consider the code with GET method:

$sql = 
    "SELECT 
        videoID 
     FROM 
        likes 
     WHERE 
        videoID = '" .mysql_real_escape_string($videoID). "' AND UID = '" .mysql_real_escape_string($userID). "' LIMIT 1";
        $connection->execute($sql);

Again, mysql_real_escape_string is used for encoding, ensuring the security of this code.

In both cases, the use of mysql_real_escape_string prevents attacks by properly escaping user inputs. However, it's essential to always treat any non-constant input as user input to mitigate potential vulnerabilities.

Mitigating SQL Injections

To enhance security and prevent SQL injections, it's recommended to use PDO with prepared statements. This modern approach ensures that user inputs are properly encoded, eliminating potential security breaches.

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