数据库和 Doctrine ORM

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// src/Entity/Product.php
namespace App\Entity;

use App\Repository\ProductRepository;
use Doctrine\ORM\Mapping as ORM;

#[ORM\Entity(repositoryClass: ProductRepository::class)]
class Product
{
    #[ORM\Id]
    #[ORM\GeneratedValue]
    #[ORM\Column]
    private ?int $id = null;

    #[ORM\Column(length: 255)]
    private ?string $name = null;

    #[ORM\Column]
    private ?int $price = null;

    public function getId(): ?int
    {
        return $this->id;
    }

    // ... getter and setter methods
}

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// src/Controller/ProductController.php
namespace App\Controller;

// ...
use App\Entity\Product;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;

class ProductController extends AbstractController
{
    #[Route('/product', name: 'create_product')]
    public function createProduct(EntityManagerInterface $entityManager): Response
    {
        $product = new Product();
        $product->setName('Keyboard');
        $product->setPrice(1999);
        $product->setDescription('Ergonomic and stylish!');

        // tell Doctrine you want to (eventually) save the Product (no queries yet)
        $entityManager->persist($product);

        // actually executes the queries (i.e. the INSERT query)
        $entityManager->flush();

        return new Response('Saved new product with id '.$product->getId());
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
use Symfony\Component\Validator\Validator\ValidatorInterface;
// ...

class ProductController extends AbstractController
{
    #[Route('/product', name: 'create_product')]
    public function createProduct(ValidatorInterface $validator): Response
    {
        $product = new Product();

        // ... update the product data somehow (e.g. with a form) ...

        $errors = $validator->validate($product);
        if (count($errors) > 0) {
            return new Response((string) $errors, 400);
        }

        // ...
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
// ...

class ProductController extends AbstractController
{
    #[Route('/product/{id}', name: 'product_show')]
    public function show(EntityManagerInterface $entityManager, int $id): Response
    {
        $product = $entityManager->getRepository(Product::class)->find($id);

        if (!$product) {
            throw $this->createNotFoundException(
                'No product found for id '.$id
            );
        }

        return new Response('Check out this great product: '.$product->getName());

        // or render a template
        // in the template, print things with {{ product.name }}
        // return $this->render('product/show.html.twig', ['product' => $product]);
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use App\Repository\ProductRepository;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
// ...

class ProductController extends AbstractController
{
    #[Route('/product/{id}', name: 'product_show')]
    public function show(ProductRepository $productRepository, int $id): Response
    {
        $product = $productRepository
            ->find($id);

        // ...
    }
}

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$repository = $entityManager->getRepository(Product::class);

// look for a single Product by its primary key (usually "id")
$product = $repository->find($id);

// look for a single Product by name
$product = $repository->findOneBy(['name' => 'Keyboard']);
// or find by name and price
$product = $repository->findOneBy([
    'name' => 'Keyboard',
    'price' => 1999,
]);

// look for multiple Product objects matching the name, ordered by price
$products = $repository->findBy(
    ['name' => 'Keyboard'],
    ['price' => 'ASC']
);

// look for *all* Product objects
$products = $repository->findAll();

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use App\Repository\ProductRepository;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
// ...

class ProductController extends AbstractController
{
    #[Route('/product/{id}')]
    public function show(Product $product): Response
    {
        // use the Product!
        // ...
    }
}

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// src/Controller/ProductController.php
namespace App\Controller;

use App\Entity\Product;
use App\Repository\ProductRepository;
use Doctrine\ORM\EntityManagerInterface;
use Symfony\Component\HttpFoundation\Response;
use Symfony\Component\Routing\Attribute\Route;
// ...

class ProductController extends AbstractController
{
    #[Route('/product/edit/{id}', name: 'product_edit')]
    public function update(EntityManagerInterface $entityManager, int $id): Response
    {
        $product = $entityManager->getRepository(Product::class)->find($id);

        if (!$product) {
            throw $this->createNotFoundException(
                'No product found for id '.$id
            );
        }

        $product->setName('New product name!');
        $entityManager->flush();

        return $this->redirectToRoute('product_show', [
            'id' => $product->getId()
        ]);
    }
}

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// src/Repository/ProductRepository.php
namespace App\Repository;

use App\Entity\Product;
use Doctrine\Bundle\DoctrineBundle\Repository\ServiceEntityRepository;
use Doctrine\Persistence\ManagerRegistry;

class ProductRepository extends ServiceEntityRepository
{
    public function __construct(ManagerRegistry $registry)
    {
        parent::__construct($registry, Product::class);
    }
}

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// src/Repository/ProductRepository.php

// ...
class ProductRepository extends ServiceEntityRepository
{
    public function __construct(ManagerRegistry $registry)
    {
        parent::__construct($registry, Product::class);
    }

    /**
     * @return Product[]
     */
    public function findAllGreaterThanPrice(int $price): array
    {
        $entityManager = $this->getEntityManager();

        $query = $entityManager->createQuery(
            'SELECT p
            FROM App\Entity\Product p
            WHERE p.price > :price
            ORDER BY p.price ASC'
        )->setParameter('price', $price);

        // returns an array of Product objects
        return $query->getResult();
    }
}