chore(hw-03): sync user-service code from hw-02
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user
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package com.example;
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import java.util.Scanner;
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public class Main {
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public static void main(String[] args) {
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UserDao userDao = new UserDao();
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Scanner scanner = new Scanner(System.in);
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try {
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while (true) {
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printMenu();
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String choice = scanner.nextLine();
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clearConsole();
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try {
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switch (choice) {
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case "1" -> createUser(userDao, scanner);
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case "2" -> findUser(userDao, scanner);
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case "3" -> updateUser(userDao, scanner);
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case "4" -> deleteUser(userDao, scanner);
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case "0" -> {
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return;
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}
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default -> System.out.println("Неизвестная команда.");
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}
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} catch (NumberFormatException e) {
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System.out.println("Ошибка: введите корректное число.");
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} catch (RuntimeException e) {
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System.out.println("Ошибка при работе с базой данных.");
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}
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}
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} finally {
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scanner.close();
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userDao.close();
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}
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}
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private static void printMenu() {
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System.out.println("\n1. Создать пользователя");
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System.out.println("2. Найти пользователя");
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System.out.println("3. Обновить пользователя");
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System.out.println("4. Удалить пользователя");
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System.out.println("0. Выход");
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System.out.print("Выберите действие: ");
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}
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private static void createUser(UserDao userDao, Scanner scanner) {
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User user = new User();
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System.out.print("Имя: ");
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user.setName(scanner.nextLine());
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System.out.print("Email: ");
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user.setEmail(scanner.nextLine());
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System.out.print("Возраст: ");
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user.setAge(Integer.parseInt(scanner.nextLine()));
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userDao.create(user);
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System.out.println("Пользователь создан: " + user);
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}
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private static void findUser(UserDao userDao, Scanner scanner) {
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System.out.print("ID пользователя: ");
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Long id = Long.parseLong(scanner.nextLine());
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User user = userDao.findById(id);
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if (user != null) {
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System.out.println(user);
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} else {
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System.out.println("Пользователь не найден.");
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}
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}
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private static void updateUser(UserDao userDao, Scanner scanner) {
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System.out.print("ID пользователя: ");
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Long id = Long.parseLong(scanner.nextLine());
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User user = userDao.findById(id);
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if (user == null) {
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System.out.println("Пользователь не найден.");
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return;
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}
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System.out.print("Новое имя: ");
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user.setName(scanner.nextLine());
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System.out.print("Новый email: ");
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user.setEmail(scanner.nextLine());
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System.out.print("Новый возраст: ");
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user.setAge(Integer.parseInt(scanner.nextLine()));
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userDao.update(user);
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System.out.println("Пользователь обновлён.");
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}
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private static void deleteUser(UserDao userDao, Scanner scanner) {
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System.out.print("ID пользователя: ");
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Long id = Long.parseLong(scanner.nextLine());
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userDao.deleteById(id);
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System.out.println("Пользователь удалён.");
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}
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private static void clearConsole() {
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System.out.print("\033[H\033[2J");
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System.out.flush();
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}
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}
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@@ -0,0 +1,94 @@
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package com.example;
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import jakarta.persistence.Column;
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import jakarta.persistence.Entity;
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import jakarta.persistence.GeneratedValue;
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import jakarta.persistence.GenerationType;
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import jakarta.persistence.Id;
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import jakarta.persistence.PrePersist;
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import jakarta.persistence.Table;
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import java.time.LocalDateTime;
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@Entity
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@Table(name = "users")
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public class User {
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@Id
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@GeneratedValue(strategy = GenerationType.IDENTITY)
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private Long id;
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@Column(nullable = false, length = 100)
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private String name;
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@Column(nullable = false, unique = true, length = 255)
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private String email;
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@Column(nullable = false)
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private Integer age;
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@Column(name = "created_at", nullable = false, updatable = false)
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private LocalDateTime createdAt;
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protected User() {}
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public User(String name, String email, Integer age) {
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this.name = name;
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this.email = email;
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this.age = age;
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}
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@PrePersist
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protected void onCreate() {
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createdAt = LocalDateTime.now();
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}
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public Long getId() {
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return id;
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}
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public String getName() {
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return name;
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}
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public String getEmail() {
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return email;
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}
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public Integer getAge() {
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return age;
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}
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public LocalDateTime getCreatedAt() {
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return createdAt;
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}
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public void setName(String name) {
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this.name = name;
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}
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public void setEmail(String email) {
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this.email = email;
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}
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public void setAge(Integer age) {
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this.age = age;
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}
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@Override
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public String toString() {
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return "User{"
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+ "id="
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+ id
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+ ", name='"
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+ name
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+ '\''
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+ ", email='"
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+ email
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+ '\''
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+ ", age="
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+ age
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+ ", createdAt="
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+ createdAt
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+ '}';
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}
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}
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@@ -0,0 +1,96 @@
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package com.example;
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import org.hibernate.HibernateException;
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import org.hibernate.Session;
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import org.hibernate.SessionFactory;
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import org.hibernate.Transaction;
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import org.hibernate.cfg.Configuration;
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public class UserDao {
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private final SessionFactory sessionFactory;
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public UserDao() {
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sessionFactory =
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new Configuration().configure().addAnnotatedClass(User.class).buildSessionFactory();
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}
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public User create(User user) {
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Transaction transaction = null;
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try (Session session = sessionFactory.openSession()) {
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transaction = session.beginTransaction();
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session.persist(user);
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transaction.commit();
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return user;
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} catch (HibernateException e) {
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handleException(transaction, e);
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return null;
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}
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}
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public User findById(Long id) {
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try (Session session = sessionFactory.openSession()) {
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return session.find(User.class, id);
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} catch (HibernateException e) {
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handleException(null, e);
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return null;
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}
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}
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public User update(User user) {
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Transaction transaction = null;
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try (Session session = sessionFactory.openSession()) {
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transaction = session.beginTransaction();
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User updatedUser = session.merge(user);
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transaction.commit();
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return updatedUser;
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} catch (HibernateException e) {
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handleException(transaction, e);
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return null;
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}
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}
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public void deleteById(Long id) {
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Transaction transaction = null;
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try (Session session = sessionFactory.openSession()) {
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transaction = session.beginTransaction();
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User user = session.find(User.class, id);
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if (user != null) {
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session.remove(user);
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}
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transaction.commit();
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} catch (HibernateException e) {
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handleException(transaction, e);
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}
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}
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public void close() {
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sessionFactory.close();
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}
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private void handleException(Transaction transaction, HibernateException e) {
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if (transaction != null) {
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try {
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transaction.rollback();
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} catch (HibernateException rollbackException) {
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System.err.println("Ошибка при откате транзакции.");
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}
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}
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System.err.println("Ошибка при работе с Hibernate: " + e.getMessage());
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throw e;
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}
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}
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@@ -0,0 +1,32 @@
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<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE hibernate-configuration PUBLIC "-//Hibernate/Hibernate Configuration DTD 3.0//EN" "https://hibernate.org/dtd/hibernate-configuration-3.0.dtd">
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<hibernate-configuration>
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<session-factory>
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<property name="hibernate.connection.driver_class"> org.postgresql.Driver </property>
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<property name="hibernate.connection.url"> jdbc:postgresql://localhost:5432/user_service </property>
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<property name="hibernate.connection.username"> postgres </property>
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<property name="hibernate.connection.password"> postgres </property>
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<property name="hibernate.dialect"> org.hibernate.dialect.PostgreSQLDialect </property>
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<property name="hibernate.show_sql"> true </property>
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<property name="hibernate.format_sql"> true </property>
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<property name="hibernate.hbm2ddl.auto"> update </property>
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<!-- SQL logging -->
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<property name="hibernate.show_sql">true</property>
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<property name="hibernate.format_sql">true</property>
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<property name="hibernate.highlight_sql">true</property>
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</session-factory>
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</hibernate-configuration>
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