<?php
  define('MODX_API_MODE', true);
  require_once(dirname(dirname(dirname(__FILE__))).'/index.php');
  $qUpd=$modx->prepare("
    UPDATE modx_ms2_products SET price=:price WHERE article=:article
  ");

   updateDB($node, $qUpd);

  function updateDB($node, $qUpd) {
    $qUpd->execute(array(
      ':price'      =>  $node->price,
      ':article'      =>    $node->article
    ));
  }