private function load_check_essentials()
{
$stmt = $this->file_db->prepare('SELECT format_version,password_hash,private_access,cant_modify,cant_delete,record_version FROM cinsimp_stack');
$stmt->execute();
$row = $stmt->fetch(PDO::FETCH_NUM);
if ($row[0] > 1) {
CinsImpError::_general('Stack Too New', 'Stack was created with a newer version of CinsImp');
}
$this->password_hash = $row[1];
$this->private_access = Stack::decode_bool($row[2]);
$this->cant_modify = Stack::decode_bool($row[3]);
$this->cant_delete = Stack::decode_bool($row[4]);
$this->record_version = intval($row[5]);
}
