app/code/core/Mage/SalesRule/Model/Mysql4/Rule/Customer.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_SalesRule
 * @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)
 */



class Mage_SalesRule_Model_Mysql4_Rule_Customer extends Mage_Core_Model_Mysql4_Abstract
{
    protected function _construct()
    {
        $this->_init('salesrule/rule_customer', 'rule_customer_id');
    }

    /**
     * Get rule usage record for a customer
     *
     * @param Mage_SalesRule_Model_Rule_Customer $rule
     * @param int $customerId
     * @param int $ruleId
     * @return Mage_SalesRule_Model_Mysql4_Rule_Customer
     */
    public function loadByCustomerRule($rule, $customerId, $ruleId)
    {
        $read = $this->_getReadAdapter();
        $select = $read->select()->from($this->getMainTable())
            ->where('customer_id=?', $customerId)
            ->where('rule_id=?', $ruleId);
        $data = $read->fetchRow($select);
        if (false === $data) {
            // set empty data, as an existing rule object might be used
            $data = array();
        }
        $rule->setData($data);
        return $this;
    }
    
}

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