在表单中显示一个数据库的信息以持久化到另一个数据库Php-Symfony中

namespace App\Entity;

use Doctrine\ORM\Mapping as ORM;

/**
 * @ORM\Entity
 * @ORM\Table(name="user")
 */
class User
{
    /**
     * @ORM\Id
     * @ORM\GeneratedValue
     * @ORM\Column(type="integer")
     */
    private $id;

    /**
     * @ORM\Column(type="string")
     */
    private $username;

    /**
     * @ORM\Column(type="string")
     */
    private $email;

    // Getters and setters
    // ...
}

namespace App\Form;

use App\Entity\User;
use Symfony\Component\Form\AbstractType;
use Symfony\Component\Form\FormBuilderInterface;
use Symfony\Component\OptionsResolver\OptionsResolver;
use Symfony\Component\Form\Extension\Core\Type\TextType;
use Symfony\Component\Form\Extension\Core\Type\EmailType;

class UserType extends AbstractType
{
    public function buildForm(FormBuilderInterface $builder, array $options)
    {
        $builder
            ->add('username', TextType::class)
            ->add('email', EmailType::class);
    }

    public function configureOptions(OptionsResolver $resolver)
    {
        $resolver->setDefaults([
            'data_class' => User::class,
        ]);
    }
}

namespace App\Controller;

use App\Entity\User;
use App\Form\UserType;
use Symfony\Bundle\FrameworkBundle\Controller\AbstractController;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Annotation\Route;

class UserController extends AbstractController
{
    /**
     * @Route("/user/create", name="user_create")
     */
    public function create(Request $request): Response
    {
        $user = new User();
        $form = $this->createForm(UserType::class, $user);

        $form->handleRequest($request);
        if ($form->isSubmitted() && $form->isValid()) {
            $entityManager = $this->getDoctrine()->getManager();
            $entityManager->persist($user);
            $entityManager->flush();

            // Redirect or return response
        }

        return $this->render('user/create.html.twig', [
            'form' => $form->createView(),
        ]);
    }
}

{% extends 'base.html.twig' %}

{% block body %}
    <h1>Create User</h1>

    {{ form_start(form) }}
        {{ form_row(form.username) }}
        {{ form_row(form.email) }}

        <button type="submit">Create</button>
    {{ form_end(form) }}
{% endblock %}