在CompilerPass类中获取实体管理器

use Symfony\Component\DependencyInjection\Compiler\CompilerPassInterface;
use Symfony\Component\DependencyInjection\ContainerBuilder;
use Symfony\Component\DependencyInjection\Reference;

class MyCompilerPass implements CompilerPassInterface
{
    public function process(ContainerBuilder $container)
    {
        // 获取实体管理器服务
        $entityManagerServiceId = 'doctrine.orm.default_entity_manager';
        $entityManagerDefinition = $container->findDefinition($entityManagerServiceId);

        // 执行数据库操作
        // $entityManager = $entityManagerDefinition->getArgument(0);
        // $entityManager->getRepository(...);
        // $entityManager->persist(...);
        // $entityManager->flush();
    }
}