static public function updateTransaction() 
  {
    $result = TransactionCollection::verifyFields();

    if(count($result))
      return ($result);

    $fields = explode(',','security1,Amount,account,status');
    $fieldsDb = explode(',','id_isin1,amount1,id_account,status');

$partOfQuery = array();
  foreach($fields as $key=>$value):
    $partOfQuery[]="`".$fieldsDb[$key]."` = '".$_POST[$fields[$key]]."'";
  endforeach;
$query = "UPDATE `transactions` SET ".implode(" , ",$partOfQuery)." WHERE id = '".$_POST['id']."';";
//echo$query;
mysql_query($query);
header('location: transaction_updated.php');
  }