Php 实体经理在Symfony上的表现

我必须为数据迁移制作一个命令，但是执行时间太长，并且在长时间后崩溃，我需要使它更快，你能帮助我吗？这里有一个例子：

处境

• 我有一个问题实体
  
• 我有一个客户实体
  
• 我有一个MatterCastomer实体
  
• 物质有一个或多个MatterCustomer
  
• 客户可以是无业务或多业务客户
  请注意，实体之间的链接设置正确
  

命令

function execute(InputInterface $input, OutputInterface $output)
{
    // Here connection to old database
    $this->pdo = $this->container()->get('app.command_oldbase.odbase_helper')->connectToDatabase();
    $em = $this->getContainer()->get('doctrine')->getManager();
    $em->getConnection()->beginTransaction()
    $em->getConnection()->setAutoCommit(false);
    try{
        $this->migrateMatters($output);
    } catch (Exception $e) {
        $em->getConnection()->rollback();
        throw $e;
    }
    $em->getConnection()->commit();
}

function migrateMatters(OutputInterface $output)
{
    $statement = $this->pdo->prepare('Select id,name From oldmatter');
    $statement->execute();
    $oldmatters = $statement->fetchAll();

    foreach ($oldmatters As $oldmatter) {
       $this->em = $this->getContainer()->get('doctrine')->getManager();
       $matter = (new Matter())
           ->setName($oldmatter['name'])
       ;
       $this->em->persist($matter);
       $this->em->flush();

       $this->setMatterCustomer($matter, $oldmatter['id']);

       $this->em->clear();
    }
}

function setMatterCustomer(Matter $matter, int $oldmatter_id)
{
    $statement = $this->pdo->prepare('Select customername From oldmattercustomers Where oldmatter_id = :oldmatter_id');
    $statement->bindParam(':oldmatter_id', $oldmatter_id);
    $statement->execute();
    $oldcustomers = $statement->fetchAll();

    foreach ($oldcustomers As $oldcustomer) {
        //search customer in Customer entity 
        $customer = $this->em->getRepository(Customer::class)->findOneBy(['name' => $oldcustomer['customername']]);

        //search if MatterCustomer exist
        $matterCustomer = $this->em->getRepository(MatterCustomer::class)->findOneBy(['matter' => $matter, 'customer' => $customer]);

        if ($matterCustomer == null) {
            $matterCustomer = (new MatterCustomer())
               ->setContact($contact)
               ->setMatter($matter)
            ;
            //add MatterCustomer to arrayCollection in Matter
            $matter->addCustomer($matterCustomer);
            $this->em->persist($matter);
            $this->em->flush();
        }
    }
 }

使用

用于客户事务。所以，首先您需要创建Matter实例，然后添加到MatterCastomer实例，以此类推。然后执行持久化，当然只执行一个实例

如果存在多个实体，那么禁用日志记录可能会减少内存消耗

$this->em->getConnection（）->getConfiguration（）->setSQLLogger（null）

使用
--no debug
选项（或在
prod
模式下）运行命令，将减少内存消耗