zend framework2 的transaction

zend framework2 可以通过以下方式实现transaction。

＊注＊：在别的地方，设置了名称为valuation_objects的Session，此Session包含一个多维数组。
$adapter的$this->config是通过ServiceManager处理的，也可以通过由浅入深详细剖析Zend Framework 2 数据库连接，获取数据实现。

    public function saveObjectsAction() {
        $sessionObjects = new Container('valuation_objects');
        $objects = $sessionObjects->objects;
        $valuationId = $this->params()->fromRoute('id');
        $sessionObjects->objects = null;
        $adapter = new Adapter($this->config);
        $connection = null;
        try{
            //如果将下面这一行的注释去掉，数组编号为20的entity的id设置为null，将会执行数据写入操作的回滚处理，
            //$objects[20]['entity']['id'] = null;
            $connection = $adapter->getDriver()->getConnection();
            $connection->beginTransaction();
            foreach ($objects as $key => $object) {
                foreach($object['valuateUsers'] as $val)
                $adapter->query(
                    "INSERT INTO valuation_objects(valuate_user_id, valuated_user_id, valuation_id) VALUES (?, ?, ?);",
                    array($object['entity']['id'], $val['id'], $valuationId)
                );
            }
            $connection->commit();
            $valuationTable = $this->getServiceLocator()->get('ValuationTable');
            $valuationTable->updateDecide($valuationId, 1);
        } catch (Exception $e) {
            if ($connection instanceof \Zend\Db\Adapter\Driver\ConnectionInterface) {
                $connection->rollback();
            }
        }
    }