Magento执行原生SQL，批量修改商品价格

<?php
/**
* @date 2015年5月26日
* 修改商品价格
* (Special Price商品折扣价为当前商品原价price;原价：小于等于300的价格*1.2,300到600的价格*1.15,600以上的价格*1.2)
*/

define('MAGENTO', realpath(dirname(__FILE__)));
require_once MAGENTO . '/app/Mage.php';
umask(0);
Mage::app()->setCurrentStore(Mage_Core_Model_App::ADMIN_STORE_ID);

//1.查询所有商品原价price
$sql = "select entity_id, value from catalog_product_entity_decimal  where attribute_id=75";
$handle = Mage::getSingleton('core/resource')->getConnection('core_write');
$query = $handle->query($sql);

while ($row = $query->fetch()) {
$row = new Varien_Object($row);
echo $row->getentity_id() . '====' . $row->getValue() . "<br/>";

//2.循环修改(把原价值给Special Price,attribute_id=76的该条记录value值就是商品折扣价)
$sql = "update catalog_product_entity_decimal set `value`= ".$row->getValue()." where attribute_id=76 and entity_id =".$row->getentity_id();

//echo $sql.'<br>';
$handle->query($sql); //执行SQL

//3.修改price的值（原价）
if((int)$row->getValue() >300 && (int)$row->getValue() <=600 ){
$sql = "update catalog_product_entity_decimal set `value`= value*1.15 where attribute_id=75 and entity_id =".$row->getentity_id();
$handle->query($sql); //执行SQL
}else{
$sql = "update catalog_product_entity_decimal set `value`= value*1.2 where attribute_id=75 and entity_id =".$row->getentity_id();
$handle->query($sql); //执行SQL
}
}