MySQL 함수를 PDO로 대체하는 방법: PHP의 최신 데이터베이스 연결 가이드?

$dsn = 'mysql:dbname=database_name;host=localhost';
$user = 'username';
$password = 'password';

$dbh = new PDO($dsn, $user, $password);

$dsn = 'sqlsrv:Server=localhost;Database=database_name';
$user = 'username';
$password = 'password';

$dbh = new PDO($dsn, $user, $password);

$SQL = 'SELECT ID, EMAIL FROM users WHERE user = :username';

// Prepare statement with array of named variables
$result = $dbh->prepare($SQL);
$result->execute([':username' => $username]);

// OR

// Prepare statement with named placeholder indicator
$result = $dbh->prepare($SQL);
$result->bindValue(':username', $username);
$result->execute();

// Fetch a single row as an array
$row = $result->fetch();

// Fetch all rows as an array
$rows = $result->fetchAll();

class PDOConnection {
    public $connection;

    public function __construct($dsn, $username, $password) {
        $this->connection = new PDO($dsn, $username, $password);
        $this->connection->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    }

    public function query($SQL) {
        return $this->connection->query($SQL);
    }

    public function prepare($SQL, $params = []) {
        $result = $this->connection->prepare($SQL);
        $result->execute($params);
        return $result;
    }
}

$db = new PDOConnection($dsn, $user, $password);

$SQL = 'SELECT ID, EMAIL FROM users WHERE user = :username';
$result = $db->prepare($SQL, ['username' => $username]);

while ($row = $result->fetch()) {
    echo $row['ID'] . ' ' . $row['EMAIL'];
}