Automatyczne tworzenie JpaRepository z interfejsu

PC30-SklepSpring/src/main/java/sklep/alternatywne_wersje_bazy_danych/ProductController_v7.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 sklep.model.Product;
+
+@Controller
+@RequestMapping("/alt7")
+public class ProductController_v7 {
+	@Autowired
+	private ProductRepository_v7 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";
+		}
+	}
+
+}

PC30-SklepSpring/src/main/java/sklep/alternatywne_wersje_bazy_danych/ProductRepository_v7.java

+package sklep.alternatywne_wersje_bazy_danych;
+
+import org.springframework.data.jpa.repository.JpaRepository;
+import org.springframework.stereotype.Repository;
+
+import sklep.model.Product;
+
+@Repository
+public interface ProductRepository_v7 extends JpaRepository<Product, Integer> {
+
+}

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

@@ -38,11 +38,5 @@ public class ProductController {
 			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/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.data.jpa.repository.JpaRepository;
 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) {
-		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();
-	}
+public interface ProductRepository extends JpaRepository<Product, Integer> {
+
 }