Quản lý sinh viên bằng db4o

Book.java

package Bai1;

import com.db4o.ObjectContainer;
import com.db4o.ObjectSet;
import com.db4odoc.f1.chapter1.Pilot;

import java.util.List;
import java.util.Scanner;

public class Book {
  private String name;
  private String author;
  private String description;
  private int year;

  public Book() {
  }

  public Book(String name) {
    this.name = name;
  }

  public Book(String name, String author, String description, int year) {
    this.name = name;
    this.author = author;
    this.description = description;
    this.year = year;
  }

  public String getName() {
    return name;
  }

  public void setName(String name) {
    this.name = name;
  }

  public String getAuthor() {
    return author;
  }

  public void setAuthor(String author) {
    this.author = author;
  }

  public String getDescription() {
    return description;
  }

  public void setDescription(String description) {
    this.description = description;
  }

  public int getYear() {
    return year;
  }

  public void setYear(int year) {
    this.year = year;
  }

  public void addBook(ObjectContainer db) {
    Scanner scanner = new Scanner(System.in);
    System.out.printf("Nhap ten: ");
    setName(scanner.nextLine());
    System.out.printf("Nhap tac gia: ");
    setAuthor(scanner.nextLine());
    System.out.printf("Nhap tom tat: ");
    setDescription(scanner.nextLine());
    System.out.printf("Nhap nam xuat ban: ");
    setYear(scanner.nextInt());

    Book book = new Book(this.name, this.author, this.description, this.year);
    db.store(book);
  }

  public static void listResult(List<?> result) {
    System.out.println(result.size());
    for (Object o : result) {
      System.out.println(o);
    }
  }

  public void getAllDb(ObjectContainer db) {
    ObjectSet objectSet = db.queryByExample(Book.class);
    Book.listResult(objectSet);
  }

  public void updateDb(ObjectContainer db) {
    Book book = new Book();
    Scanner scanner = new Scanner(System.in);

    System.out.printf("Nhap ten can sua: ");
    String find = scanner.nextLine();

    ObjectSet result = db.queryByExample(new Book(find));
    Book found = (Book) result.next();

      int key;
      System.out.printf("Nhap muc muon sua: " +
                      "\n1. Ten" +
                      "\n2. Tac gia" +
                      "\n3. Mo ta" +
                      "\n4. Nam" +
                      "\n> ");
      key = scanner.nextInt();

      switch (key) {
        case 1:
          System.out.println("Nhap lai ten: ");
          String newName;
          newName = scanner.nextLine();
          newName = scanner.next();
          found.setName(newName);
          break;
        case 2:
          System.out.printf("Nhap lai tac gia: ");
          String newAuthor = scanner.nextLine();
          found.setAuthor(newAuthor);
          break;
        case 3:
          System.out.printf("Nhap lai mo ta: ");
          String newDescription = scanner.nextLine();
          found.setDescription(newDescription);
          break;
        case 4:
          System.out.printf("Nhap lai nam xuat ban: ");
          int newYear = scanner.nextInt();
          found.setYear(newYear);
          break;
      }
    db.store(found);
  }

  public void deteleDb(ObjectContainer db) {
    Book book = new Book();
    Scanner scanner = new Scanner(System.in);

    System.out.printf("Nhap ten sach can xoa: ");
    String find = scanner.nextLine();

    ObjectSet result = db.queryByExample(new Book(find));
    Book found = (Book) result.next();

    db.delete(found);
  }

  @Override
  public String toString() {
    return "Ten: " + name + ", Tac gia: " + author + ", Mo ta: " + description + ", Nam xuat ban: " + year;
  }
}

Main.java

package Bai1;

import com.db4o.Db4oEmbedded;
import com.db4o.ObjectContainer;

import java.io.File;

public class Main {
  final static String url = "./book.db4o";

  public static void main(String[] args) {
//    new File(url).delete();

    ObjectContainer db = Db4oEmbedded.openFile(Db4oEmbedded.newConfiguration(), url);
    Book book = new Book();

/*    book.addBook(db);
    book.getAllDb(db);
    db.close();*/

    Menu menu = new Menu(db);
  }
}

Menu.java

package Bai1;

import com.db4o.ObjectContainer;
import com.db4o.ObjectSet;

import java.util.Scanner;

public class Menu {
  static boolean check = false;
  public Menu(ObjectContainer db) {
    Scanner scanner = new Scanner(System.in);
    Book book = new Book();

    do {
      System.out.println("1. Them");
      System.out.println("2. Sua");
      System.out.println("3. Xoa");
      System.out.println("4. Xem");
      System.out.println("5. Thoat");
      int key;
      System.out.printf("> ");
      key = scanner.nextInt();

      switch (key) {
        case 1:
          book.addBook(db);
          break;
        case 2:
          book.updateDb(db);
          break;
        case 3:
          book.deteleDb(db);
          break;
        case 4:
          book.getAllDb(db);
          break;
        case 5:
          db.close();
          check = true;
          break;
      }
    } while (check != true);
  }

}