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我正在创建一个自定义模块，但它没有在表中插入数据。虽然它显示“成功”消息 这里我的 observe.php 代码是： 

   $write1 = Mage::getSingleton("core/resource")->getConnection("core_write");
                //$query_meter = "insert into  catalog_customer_product_meterreading (customer_id, product_id,meter_key ) values ($cutomer_id, $product_id,'$serial_key')";
                $query_meter =  "INSERT INTO `catalog_customer_product_meterreading` (`customer_id`, `product_id`, `meter_key`) VALUES ('2', '2', '334')";

                   // print_r($write1) ;

                    if($write1->query($query_meter)){
                        echo "Data successfully inserted.";
                        }

我的自定义表是：

CREATE TABLE IF NOT EXISTS `catalog_customer_product_meterreading` (
  `customer_id` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Customer ID',
  `product_id` int(10) unsigned NOT NULL DEFAULT '0' COMMENT 'Product ID',
  `meter_key` varchar(100) NOT NULL COMMENT 'Meter Reading with #',
  PRIMARY KEY (`customer_id`,`product_id`,`meter_key`),
  KEY `IDX_CATALOG_CATEGORY_PRODUCT_PRODUCT_ID` (`product_id`)
    ) ENGINE=InnoDB DEFAULT CHARSET=utf8 COMMENT='Meter Reading To Catalog Product   Table';



ALTER TABLE `catalog_customer_product_meterreading`
 ADD CONSTRAINT `catalog_customer_product_meterreading_ibfk_2` FOREIGN KEY (`customer_id`) REFERENCES `customer_entity` (`entity_id`)ON DELETE CASCADE ON UPDATE CASCADE,
  ADD CONSTRAINT `catalog_customer_product_meterreading_ibfk_1` FOREIGN KEY (`product_id`) REFERENCES `catalog_product_entity` (`entity_id`)ON DELETE CASCADE ON UPDATE CASCADE;

请建议我我的代码在哪里出错。如果我直接在数据库中复制/粘贴查询，它运行良好。

提前致谢

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