Веб-магазин (Spring)

package hiber.model;
import javax.persistence.*;
 
@Entity
@Table(name = "users")
public class User {
 
   @Id
   @GeneratedValue(strategy = GenerationType.IDENTITY)
   private Long id;
 
   @Column(name = "name")
   private String firstName;
 
   @Column(name = "last_name")
   private String lastName;
 
   @Column(name = "email")
   private String email;
 
   @OneToOne(cascade = CascadeType.ALL)
   @JoinColumn(name = "id_car")
   private Car car;
 
   public User(){}
 
   public User(String firstName, String lastName, String email, Car car) {
      this.firstName = firstName;
      this.lastName = lastName;
      this.email = email;
      this.car = car;
   }
 
   public User(String firstName, String lastName, String email) {
      this.firstName = firstName;
      this.lastName = lastName;
      this.email = email;
   }
 
   public Long getId() {
      return id;
   }
 
   public void setId(Long id) {
      this.id = id;
   }
 
   public String getFirstName() {
      return firstName;
   }
 
   public void setFirstName(String firstName) {
      this.firstName = firstName;
   }
 
   public String getLastName() {
      return lastName;
   }
 
   public void setLastName(String lastName) {
      this.lastName = lastName;
   }
 
   public String getEmail() {
      return email;
   }
 
   public Car getCar() {
      return car;
   }
 
   public void setCar(Car car) {
      this.car = car;
   }
 
   public void setEmail(String email) {
      this.email = email;
   }
}

package hiber.dao;
 
import hiber.model.User;
 
import java.util.List;
 
public interface UserDao {
   void add(User user);
   List<User> listUsers();
   User getUser(String model, int series);
}
 
package hiber.service;
 
import hiber.model.User;
 
import java.util.List;
 
public interface UserService {
    void add(User user);
    List<User> listUsers();
    User getUser(String model, int series);
}

package hiber.dao;
 
import hiber.model.User;
import org.hibernate.SessionFactory;
import org.hibernate.query.Query;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Repository;
 
import javax.persistence.TypedQuery;
import java.util.List;
 
@Repository
public class UserDaoImp implements UserDao {
 
   @Autowired
   private SessionFactory sessionFactory;
 
   @Override
   public void add(User user) {
      sessionFactory.getCurrentSession().save(user);
   }
 
   @Override
   @SuppressWarnings("unchecked")
   public List<User> listUsers() {
      TypedQuery<User> query=sessionFactory.getCurrentSession().createQuery("from User");
      return query.getResultList();
   }
 
   public User getUser(String model, int series) {
      User user = sessionFactory.getCurrentSession().createQuery(
                      "FROM User user WHERE user.car.series = :series AND user.car.model = :model",
                      User.class)
              .setParameter("series", series)
              .setParameter("model", model)
              .getSingleResult();
      return user;
   }
}
 
package hiber.service;
 
import hiber.dao.UserDao;
import hiber.model.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
 
import java.util.List;
 
@Service
public class UserServiceImp implements UserService {
 
   @Autowired
   private UserDao userDao;
 
   @Transactional
   @Override
   public void add(User user) {
      userDao.add(user);
   }
 
   @Transactional(readOnly = true)
   @Override
   public List<User> listUsers() {
      return userDao.listUsers();
   }
 
   @Transactional
   @Override
   public User getUser(String model, int series) {
      return userDao.getUser(model, series);
   }
}

package hiber;
 
import hiber.config.AppConfig;
import hiber.model.Car;
import hiber.model.User;
import hiber.service.UserService;
import org.springframework.context.annotation.AnnotationConfigApplicationContext;
import java.sql.SQLException;
import java.util.List;
 
public class MainApp {
   public static void main(String[] args) throws SQLException {
      AnnotationConfigApplicationContext context = 
            new AnnotationConfigApplicationContext(AppConfig.class);
 
      UserService userService = context.getBean(UserService.class);
 
      userService.add(new User("User1", "Lastname1", "user1@mail.ru", new Car("model1", 1)));
      userService.add(new User("User2", "Lastname2", "user2@mail.ru", new Car("model2", 2)));
      userService.add(new User("User3", "Lastname3", "user3@mail.ru", new Car("model3", 3)));
      userService.add(new User("User4", "Lastname4", "user4@mail.ru", new Car("model4", 4)));
 
      List<User> users = userService.listUsers();
      for (User user : users) {
         System.out.println("Id = " + user.getId());
         System.out.println("First Name = " + user.getFirstName());
         System.out.println("Last Name = " + user.getLastName());
         System.out.println("Email = " + user.getEmail());
         System.out.println("Car model: " + user.getCar().getModel());
         System.out.println("Car series: " + user.getCar().getSeries());
         System.out.println();
      }
 
      System.out.println("Search User by Car series 3 and model3...");
      User findUser = userService.getUser("model3", 3);
      System.out.println("Car's owner: " + findUser.getFirstName() + " "
              + findUser.getLastName());
 
      context.close();
   }
}