create customer order class and order item class, using hibernate annotation, relationship one to many
@Entity
@Table(name = "orders")
public class Order implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private Long id;
@Column(name = "total_amount")
private Double totalAmount;
@OneToMany(cascade = CascadeType.ALL, mappedBy = "order")
private List<OrderItem> orderItems;
// getters and setters
}