Features | Pdo V20 Extended

$pdo = new class($dsn, $user, $pass) extends PDO { private ?PDO $connection = null; private function connect(): void { if (!$this->connection) { $this->connection = new PDO($this->dsn, ...); } }

Introduction For nearly two decades, PHP Data Objects (PDO) has been the gold standard for database abstraction in PHP. It provides a lightweight, consistent interface for accessing multiple database systems, from MySQL and PostgreSQL to SQLite and Oracle.

$repository = new PdoRepository($pdo, User::class); $user = $repository->find(1); pdo v20 extended features

class UserDTO { public function __construct( public int $id, public string $name ) {} } $stmt = $pdo->prepare("SELECT id, name FROM users"); $stmt->execute(); $stmt->setFetchMode(PDO::FETCH_INTO, new UserDTO(0, '')); while ($obj = $stmt->fetch()) { echo $obj->name; // Fully populated DTO }

While not built into core PDO, the community pattern using ProxyManager or LazyConnection has become standard: $pdo = new class($dsn, $user, $pass) extends PDO { private

$pdo = new PDO('mysql:host=localhost;dbname=test', 'user', 'pass', [ PDO::ATTR_PERSISTENT => true, PDO::ATTR_TIMEOUT => 5, // connection timeout PDO::MYSQL_ATTR_MAX_BUFFER_SIZE => 1024 * 1024 * 2 ]); This reduces overhead in high-concurrency environments. No two databases are alike. PDO v20 extended features embrace driver peculiarities. 5.1 MySQL: Buffered vs Unbuffered & Server-Side Prepared Statements // Force unbuffered (low memory for large result sets) $pdo->setAttribute(PDO::MYSQL_ATTR_USE_BUFFERED_QUERY, false); // Direct server-side prepare (bypass emulation) $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false); 5.2 PostgreSQL: Asynchronous Queries (via pdo_pgsql ) PostgreSQL driver supports non-blocking queries:

#[Entity(table: 'users')] class User { #[Column(type:'integer', primary: true)] private int $id; #[Column(type:'string')] private string $email; } No two databases are alike

public function updateStatus(int $id, UserStatus $status): bool { $sql = "UPDATE users SET status = ? WHERE id = ?"; $stmt = $this->pdo->prepare($sql); return $stmt->execute([$status->value, $id]); }