app/code/core/Mage/Sales/Model/Mysql4/Order.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Sales
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */

/**
 * Order entity resource model
 *
 * @category   Mage
 * @package    Mage_Sales
 * @author      Magento Core Team <core@magentocommerce.com>
 */

class Mage_Sales_Model_Mysql4_Order extends Mage_Eav_Model_Entity_Abstract
{

    public function __construct()
    {
        $resource = Mage::getSingleton('core/resource');
        $this->setType('order');
        $read = $resource->getConnection('sales_read');
        $write = $resource->getConnection('sales_write');
        $this->setConnection($read, $write);
    }

    /**
     * Count existent products of order items by specified product types
     *
     * @param int $orderId
     * @param array $productTypeIds
     * @param bool $isProductTypeIn
     * @return array
     */
    public function aggregateProductsByTypes($orderId, $productTypeIds = array(), $isProductTypeIn = false)
    {
        $select = $this->getReadConnection()->select()
            ->from(array('o' => $this->getTable('sales/order_item')), new Zend_Db_Expr('o.product_type, COUNT(*)'))
            ->joinInner(array('p' => $this->getTable('catalog/product')), 'o.product_id=p.entity_id', array())
            ->where('o.order_id=?', $orderId)
            ->group('(1)')
        ;
        if ($productTypeIds) {
            $select->where($this->getReadConnection()->quoteInto(
                sprintf('(o.product_type %s (?))', ($isProductTypeIn ? 'IN' : 'NOT IN')),
                $productTypeIds
            ));
        }
        return $this->getReadConnection()->fetchPairs($select);
    }
}

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