Poprawka konfiguracji i pierwszy program Hibernate/JPA

PC30-Hibernate/src/main/java/sklep/model/Customer.java

@@ -27,7 +27,7 @@ public class Customer {
     @Column(name = "city", length = 100)
     private String city;
 
-    @OneToMany(mappedBy = "customerEmail")
+    @OneToMany(mappedBy = "customer")
     private Set<Order> orders = new LinkedHashSet<>();
 
     public String getCustomerEmail() {

PC30-Hibernate/src/main/java/sklep/model/Order.java

@@ -19,7 +19,7 @@ public class Order {
 
     @ManyToOne(fetch = FetchType.LAZY, optional = false)
     @JoinColumn(name = "customer_email", nullable = false)
-    private Customer customerEmail;
+    private Customer customer;
 
     @ColumnDefault("CURRENT_TIMESTAMP")
     @Column(name = "order_date", nullable = false)
@@ -27,6 +27,7 @@ public class Order {
 
     @Column(name = "delivery_date")
     private LocalDate deliveryDate;
+
     @OneToMany(mappedBy = "order")
     private Set<OrderProduct> orderProducts = new LinkedHashSet<>();
 
@@ -38,12 +39,12 @@ public class Order {
         this.id = id;
     }
 
-    public Customer getCustomerEmail() {
-        return customerEmail;
+    public Customer getCustomer() {
+        return customer;
     }
 
-    public void setCustomerEmail(Customer customerEmail) {
-        this.customerEmail = customerEmail;
+    public void setCustomer(Customer customerEmail) {
+        this.customer = customerEmail;
     }
 
     public Instant getOrderDate() {

PC30-Hibernate/src/main/java/sklep/programy/P01_JedenProdukt.java

+package sklep.programy;
+
+import jakarta.persistence.EntityManager;
+import jakarta.persistence.EntityManagerFactory;
+import jakarta.persistence.Persistence;
+import sklep.model.Product;
+
+import javax.swing.*;
+
+public class P01_JedenProdukt {
+    public static void main(String[] args) {
+        System.out.println("Początek programu");
+        EntityManagerFactory emf = Persistence.createEntityManagerFactory("sklep_pu");
+        System.out.println("Mam factory: " + emf);
+        EntityManager em = emf.createEntityManager();
+        System.out.println("Mam em: " + em);
+
+        Integer id = Integer.valueOf(JOptionPane.showInputDialog("Podaj id produktu"));
+        Product product = em.find(Product.class, id);
+        // w razie braku takiego rekordu, wynikiem jest null
+        if(product == null) {
+            System.out.println("Nie ma produktu o numerze " + id);
+        } else {
+            System.out.println("Odczytany produkt: " + product);
+            System.out.println(product.getProductName() + " za cenę " + product.getPrice());
+            if(product.getDescription() != null) {
+                System.out.println(product.getDescription());
+            }
+        }
+
+        em.close();
+        emf.close();
+    }
+}

PC30-Hibernate/src/main/resources/META-INF/persistence.xml

+<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
+<persistence xmlns="https://jakarta.ee/xml/ns/persistence"
+             xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+             xsi:schemaLocation="https://jakarta.ee/xml/ns/persistence https://jakarta.ee/xml/ns/persistence/persistence_3_0.xsd"
+             version="3.0">
+    <persistence-unit name="sklep_pu" transaction-type="RESOURCE_LOCAL">
+        <class>sklep.model.Product</class>
+        <class>sklep.model.Customer</class>
+        <class>sklep.model.Order</class>
+        <class>sklep.model.OrderProduct</class>
+        <properties>
+            <property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/sklep"/>
+            <property name="javax.persistence.jdbc.user" value="alx"/>
+            <property name="javax.persistence.jdbc.password" value="abc123"/>
+            <property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
+            <property name="hibernate.show_sql" value="true"/>
+        </properties>
+    </persistence-unit>
+</persistence>