Jeszcze jedna wersja z EntityManagerem

PC30-SklepSpring/src/main/java/sklep/alternatywne_wersje_bazy_danych/ProductController_v6.java

+package sklep.alternatywne_wersje_bazy_danych;
+
+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 org.springframework.web.bind.annotation.RequestMapping;
+import org.springframework.web.bind.annotation.RequestParam;
+
+import sklep.model.Product;
+
+@Controller
+@RequestMapping("/alt6/products")
+public class ProductController_v6 {
+	@Autowired
+	private ProductRepository_v6 productRepository;
+	
+	@GetMapping
+	public String wszystkieProdukty(Model model) {
+		List<Product> products = productRepository.findAll();
+		model.addAttribute("products", products);
+		return "products";
+	}
+
+	@GetMapping("/{id}")
+	public String jedenProdukt(@PathVariable int id, Model model) {
+		Optional<Product> product = productRepository.findById(id);
+		if(product.isPresent()) {
+			model.addAttribute("product", product.get());
+			return "product";
+		} else {
+			model.addAttribute("product_id", id);
+			return "missing_product";
+		}
+	}
+	
+	@GetMapping("/szukaj")
+	public String wyszukajProdukty(@RequestParam String name, Model model) {
+		List<Product> products = productRepository.findByProductName(name);
+		model.addAttribute("products", products);
+		return "products";
+	}
+}

PC30-SklepSpring/src/main/java/sklep/alternatywne_wersje_bazy_danych/ProductRepository_v6.java

+package sklep.alternatywne_wersje_bazy_danych;
+
+import java.util.List;
+import java.util.Optional;
+
+import sklep.model.Product;
+
+public interface ProductRepository_v6 {
+
+	List<Product> findAll();
+
+	Optional<Product> findById(int productId);
+
+	List<Product> findByProductName(String name);
+
+}
\ No newline at end of file

PC30-SklepSpring/src/main/java/sklep/alternatywne_wersje_bazy_danych/ProductRepository_v6_Impl.java

+package sklep.alternatywne_wersje_bazy_danych;
+
+import java.util.List;
+import java.util.Optional;
+
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Repository;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.TypedQuery;
+import sklep.model.Product;
+
+@Repository
+public class ProductRepository_v6_Impl implements ProductRepository_v6 {
+	@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) {
+		return Optional.ofNullable(em.find(Product.class, productId));
+	}
+	
+	public List<Product> findByProductName(String name) {
+		final String sql = "SELECT p FROM Product p WHERE p.productName = :name";
+		TypedQuery<Product> query = em.createQuery(sql, Product.class);
+		query.setParameter("name", name);
+		return query.getResultList();
+	}
+}