about pdo and sqlite2

[Yarco]

I'm trying hard to use pdo and sqlite2 without php_pdo_sqlite.dll
extension.
The code:

$dsn = 'sqlite2::memory:';
$buf = <<<SQL
CREATE TABLE test
(
id INT,
name VARCHAR(20),
pass VARCHAR(20)
);
SQL;

try {
$pdo = new PDO($dsn);
$pdo->query($buf);
//...
} catch (PDOException $e) {
//...
}

print_r($pdo);

But i get nothing.
And the pdo_sqlite of php document seems wrong, it use
'sqlite2:memory:' to define $dsn. I get error when i do that.
Anyone have exp. on pdo and sqlite?