Odczyt jednego produktu

PC27-Hibernate/src/main/java/sklep/model/OrderProduct.java

@@ -25,12 +25,12 @@ public class OrderProduct implements Serializable {
 
 	//bi-directional many-to-one association to Order
 	@ManyToOne
-	@JoinColumn(name="order_id")
+	@JoinColumn(name="order_id", insertable=false, updatable=false)
 	private Order order;
 
 	//uni-directional many-to-one association to Product
 	@ManyToOne
-	@JoinColumn(name="product_id")
+	@JoinColumn(name="product_id", insertable=false, updatable=false)
 	private Product product;
 
 	public OrderProduct() {

PC27-Hibernate/src/main/java/sklep/przyklady/OdczytajJedenProdukt1.java

+package sklep.przyklady;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+import sklep.model.Product;
+
+public class OdczytajJedenProdukt1 {
+
+	public static void main(String[] args) {
+		System.out.println("Początek programu");
+		EntityManagerFactory emf = Persistence.createEntityManagerFactory("sklep");
+		EntityManager em = emf.createEntityManager();
+		
+		System.out.println("Mam entity managera: " + em);
+		
+		Product product = em.find(Product.class, 1);
+		System.out.println("Odczytany produkt: " + product);
+		System.out.println(product.getProductName() + " za cenę " + product.getPrice() + ", opis: " + product.getDescription());
+		
+		em.close();
+		emf.close();
+	}
+
+}

PC27-Hibernate/src/main/java/sklep/przyklady/OdczytajJedenProdukt2.java

+package sklep.przyklady;
+
+import java.util.Scanner;
+
+import javax.persistence.EntityManager;
+import javax.persistence.EntityManagerFactory;
+import javax.persistence.Persistence;
+
+import sklep.model.Product;
+
+public class OdczytajJedenProdukt2 {
+
+	public static void main(String[] args) {
+		Scanner sc = new Scanner(System.in);
+		EntityManagerFactory emf = Persistence.createEntityManagerFactory("sklep");
+		EntityManager em = emf.createEntityManager();
+		
+		System.out.println("Aby zakończyć, podaj liczbę 0");
+		while(true) {
+			System.out.print("\nPodaj id produktu: ");
+			int id = sc.nextInt();
+			if(id == 0) break;
+		
+			Product product = em.find(Product.class, id);
+			if(product != null) {
+				System.out.println("Odczytany produkt: " + product);
+				System.out.println(product.getProductName() + " za cenę " + product.getPrice() + ", opis: " + product.getDescription());
+			} else {
+				System.out.println("Nie ma produktu o id " + id);
+			}
+		}
+
+		em.close();
+		emf.close();
+	}
+
+}