public function save(User $user)
{
$data = array('username' => $user->getUsername(), 'password' => $user->getPassword(), 'name' => $user->getName(), 'valid' => $user->getValid(), 'role' => $user->getRole());
$id = (int) $user->getId();
if ($id == 0) {
$this->tableGateway->insert($data);
} else {
if ($this->get($id)) {
$this->tableGateway->update($data, array('id' => $id));
} else {
throw new \Exception('User não existe');
}
}
}