Zend Framework:如何检索最后插入行的id？

// UserModel.php
class UserModel extends Zend_Db_Table_Abstract
{
    protected $_name = 'users';
}

// UsersController.php
public function createAction()
{
    $userData = array(
        'username' => 'john_doe',
        'email' => 'john.doe@example.com',
        'password' => 'password123',
    );

    $userModel = new UserModel();
    $lastInsertId = $userModel->insert($userData);

    // 获取最后插入行的 ID
    $userId = $userModel->getAdapter()->lastInsertId();

    // 输出插入的用户 ID
    echo "Last inserted user ID: " . $userId;
}