public function addUser($data)
{
$queryBuilder = new QueryBuilder($this->db);
$queryBuilder->insert('users')->values(['email' => '?', 'password' => '?', 'key_activation' => '?'])->setParameter(0, $data['email'])->setParameter(1, $this->_hashPassword($data['password']))->setParameter(2, bin2hex(openssl_random_pseudo_bytes(10)));
return $queryBuilder->execute();
}