Magento删除信用卡号

Question

目前我正在使用phpMyAdmin中的SQL从Magento表中删除信用卡号，其中包含

等命令

  

更新mg3u_sales_flat_order_payment SET cc_number_enc = NULL

我想要一个PHP脚本，我可以执行而不是一直登录到phpMyAdmin。我曾尝试编写代码但不确定它是否可行。

<?php
 error_reporting(E_ALL);
 ini_set('display_errors', TRUE);
 ini_set('display_startup_errors', TRUE);

 require_once('app/Mage.php');
 Mage::app();

 $prefix=(string)Mage::getConfig()->getTablePrefix(); // Get Prefix

 // fetch write database connection that is used in Mage_Core module
 $write = Mage::getSingleton('core/resource')->getConnection('core_write');

 foreach ...  

 $write = Mage::getSingleton('core/resource')->getConnection('core_write');

 $write->query("update " . $prefix . "sales_flat_quote_payment set cc_number_enc=null"); // Update Quote
 $write->query("update " . $prefix . "sales_flat_order_payment set cc_number_enc=null"); // Update Order

 }
 echo "complete";