graph TD;
    A[启动应用] -->B[显示主界面]
    B --> C[用户选择操作]
    C --> D[查询图书]
    C --> E[借阅图书]
    C --> F[归还图书]
    C --> G[管理员操作]
    D --> H[显示查询结果]
    E --> I[更新数据库记录]
    F --> J[更新数据库记录]
    G --> K[添加/删除/更新图书信息]
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@Entity(tableName = "books")
public class Book {
    @PrimaryKey(autoGenerate = true)
    private int id;
    
    @ColumnInfo(name = "title")
    private String title;

    @ColumnInfo(name = "author")
    private String author;

    @ColumnInfo(name = "available")
    private boolean available;

    // Getter and Setter methods
}

@Dao
public interface BookDao {
    @Insert
    void insert(Book book);

    @Update
    void update(Book book);

    @Delete
    void delete(Book book);

    @Query("SELECT * FROM books WHERE title LIKE :search")
    List<Book> searchBooks(String search);
}

@Database(entities = {Book.class}, version = 1)
public abstract class AppDatabase extends RoomDatabase {
    public abstract BookDao bookDao();
}
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public void borrowBook(int bookId) {
    AppDatabase db = Room.databaseBuilder(getApplicationContext(),
            AppDatabase.class, "library").build();
    Book book = db.bookDao().findById(bookId);
    if (book.isAvailable()) {
        book.setAvailable(false);
        db.bookDao().update(book);
        showToast("Book borrowed successfully!");
    } else {
        showToast("Book is not available.");
    }
}
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public List<Book> searchBooks(String keyword) {
    AppDatabase db = Room.databaseBuilder(getApplicationContext(),
            AppDatabase.class, "library").build();
    return db.bookDao().searchBooks("%" + keyword + "%");
}
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@Test
public void testBorrowBook() {
    LibrarySystem system = new LibrarySystem();
    system.addBook(new Book("Test Book", "Author", true));
    List<Book> books = system.searchBooks("Test Book");
    assertTrue(books.get(0).isAvailable());
    system.borrowBook(books.get(0).getId());
    assertFalse(books.get(0).isAvailable());
}
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