教义更新实体处于循环，持久还是刷新状态？ [英] Doctrine update entity in loop, persist or flush?

问题描述

我有多个循环，例如：

    $bets = $this->em->getRepository('AppBundle:Bet')->getBetsForMatch($match_id);

    foreach ($bets as $key => $bet) {
        $devices = $this->em->getRepository('AppBundle:Device')->findBy(array('user' => $bets->getUser()));

        foreach ($devices as $key => $device) {
            //HERE I SEND A PUSH NOTIFICATION

            if($this->rms_push->send($message)){
                $device->getUser()->setBadge($device->getUser()->getBadge() + 1);
                $this->em->flush();
            }
        }
    }

所以，我下所有赌注为了进行一场比赛，每次下注我都会为该用户保存所有设备，然后我需要使用以下命令更新我的用户： $ device-> getUser（）-> setBadge（$ device-> ; getUser（）-> getBadge（）+ 1）;

So, I get all bets for a match, for each bet I get all devices saved for the user, and after that I need to update my user with : $device->getUser()->setBadge($device->getUser()->getBadge() + 1);

现在，我每次都刷新，但我认为有更好的选择

For now, I flush each time but I think there is a better way, ideas ?

推荐答案

您只需要一次冲洗就可以了：

You need only one flush, out of your loop:

foreach ($bets as $key => $bet) {
    $devices = $this->em->getRepository('AppBundle:Device')->findBy(array('user' => $bets->getUser()));

    foreach ($devices as $key => $device) {
        //HERE I SEND A PUSH NOTIFICATION

        if($this->rms_push->send($message)){
            $device->getUser()->setBadge($device->getUser()->getBadge() + 1);
        }
    }
}

$this->em->flush();

调用 $ this-> _em-&persist（$ obj） 涉及创建一个新条目。

Calling $this->_em->persist($obj) involves to create a new entry.

如果需要根据条目是否存在来创建或更新，请查看 EntityManager :: merge 上的doctrine-orm / en / latest / reference / working-with-objects.html＃merging-entities rel = noreferrer>

If you need to create or update depending on the entry exists or not, look at EntityManager::merge .

要保留大量条目的内存使用量，请查看批处理。

To preserve memory usage for large number of entries, look at batch processing.

注意 SensioLabs如果您的代码在循环内调用 EntityManager :: flush ，则Insight（PHP源代码质量分析）会发出警告。

Note SensioLabs insight (PHP source code quality analysis) raises a warning if your code calls EntityManager::flush inside a loop.

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