ProductRepository zaimplementowane samodzielnie

PC30-SklepSpring/src/main/java/sklep/controller/ProductController.java

+package sklep.controller;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Controller;
+import org.springframework.ui.Model;
+import org.springframework.web.bind.annotation.GetMapping;
+import org.springframework.web.bind.annotation.PathVariable;
+
+import sklep.model.Product;
+import sklep.repository.ProductRepository;
+
+@Controller
+public class ProductController {
+	@Autowired
+	private ProductRepository productRepository;
+	
+	@GetMapping("/products")
+	public String readAllProducts(Model model) {
+		List<Product> products = productRepository.findAll();
+		model.addAttribute("products", products);
+		
+		return "products";
+	}
+	
+	@GetMapping("/products/{id}")
+	public String readOneProduct(Model model, @PathVariable("id") int productId) {
+		Optional<Product> product = productRepository.findById(productId);
+		if(product.isPresent()) {
+			model.addAttribute("product", product.get());
+		}
+		
+		return "product";
+	}
+
+}

PC30-SklepSpring/src/main/java/sklep/repository/ProductRepository.java

+package sklep.repository;
+
+import java.util.List;
+import java.util.Optional;
+
+import javax.persistence.EntityManager;
+import javax.persistence.TypedQuery;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import sklep.model.Product;
+
+@Repository
+public class ProductRepository {
+	@Autowired
+	private EntityManager em;
+	
+	public List<Product> findAll() {
+		TypedQuery<Product> query = em.createNamedQuery("Product.findAll", Product.class);
+		return query.getResultList();
+	}
+	
+	public Optional<Product> findById(int productId) {
+		Product product = em.find(Product.class, productId);
+		return Optional.ofNullable(product);
+	}
+
+}