/**
  * @param Product $product
  */
 private function saveDiscounts($product)
 {
     if ($product->isDiscountsModified()) {
         $this->getDb()->query("DELETE FROM product_discount WHERE product_id = '" . (int) $product->getId() . "'");
         foreach ($product->getDiscounts() as $product_discount) {
             $this->getDb()->query("INSERT INTO product_discount SET product_id = '" . (int) $product->getId() . "', customer_group_id = '" . (int) $product_discount['customer_group_id'] . "', quantity = '" . (int) $product_discount['quantity'] . "', priority = '" . (int) $product_discount['priority'] . "', price = '" . (double) $product_discount['price'] . "', date_start = '" . $this->getDb()->escape($product_discount['date_start']) . "', date_end = '" . $this->getDb()->escape($product_discount['date_end']) . "'");
         }
     }
 }