独立注入原则实体管理器

Question

我正在Symfony框架之外开发一个小应用程序，我想使用Symfony依赖注入组件来自动解析我的存储库，它在构造函数中需要\Doctrine\ORM\EntityManager作为参数。

我希望将现有实例绑定到依赖项注入容器--但我似乎无法从文档中找到这一点。容器似乎使用反射来获取实例的类名，然后创建一个新实例。变量$entityManager是\Doctrine\ORM\EntityManager的一个实例。

$container = new ContainerBuilder();
$container->register('doctrine.orm.entitymanager', $entityManager);
var_dump($container->get('doctrine.orm.entitymanager'));

如果我试图解析实例，组件将抛出一个ReflectionException。正确的方法是什么？

PHP Fatal error:  Uncaught exception 'ReflectionException' with message 'Access to non-public constructor of class Doctrine\ORM\EntityManager' in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php:955
Stack trace:
#0 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(955): ReflectionClass->newInstanceArgs(Array)
#1 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(488): Symfony\Component\DependencyInjection\ContainerBuilder->createService(Object(Symfony\Component\DependencyInjection\Definition), 'doctrine.orm.en...')
#2 /vagrant/sfs/test.php(12): Symfony\Component\DependencyInjection\ContainerBuilder->get('doctrine.orm.en...')
#3 {main}
  thrown in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 955

Fatal error: Uncaught exception 'ReflectionException' with message 'Access to non-public constructor of class Doctrine\ORM\EntityManager' in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php:955
Stack trace:
#0 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(955): ReflectionClass->newInstanceArgs(Array)
#1 /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php(488): Symfony\Component\DependencyInjection\ContainerBuilder->createService(Object(Symfony\Component\DependencyInjection\Definition), 'doctrine.orm.en...')
#2 /vagrant/sfs/test.php(12): Symfony\Component\DependencyInjection\ContainerBuilder->get('doctrine.orm.en...')
#3 {main}
  thrown in /vagrant/sfs/vendor/symfony/dependency-injection/Symfony/Component/DependencyInjection/ContainerBuilder.php on line 955

Answer 1

如果尝试使用新命令插入实体管理器，这将无法工作。

new EntityManager();

您必须使用EntityManagerFactory。https://github.com/doctrine/DoctrineORMModule/blob/master/src/DoctrineORMModule/Service/EntityManagerFactory.php

但是EntityManager在Symfony2中已经注册为服务。

$container->get('doctrine.orm.entity_manager');