那么，请用Ormlite框架在安卓中实现一个具体实例，请给出我Bean类，数据库Helper类，Dao类，以及实现类

好的，这是一个使用Ormlite在安卓中实现数据存储的具体实例：

Bean类：

@DatabaseTable(tableName = "user")
public class User {
    @DatabaseField(generatedId = true)
    private int id;

    @DatabaseField(columnName = "name")
    private String name;

    @DatabaseField(columnName = "age")
    private int age;

    public User() {
    }

    public User(String name, int age) {
        this.name = name;
        this.age = age;
    }

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

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

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }
}

数据库Helper类：

public class DatabaseHelper extends OrmLiteSqliteOpenHelper {
    private static final String DATABASE_NAME = "user.db";
    private static final int DATABASE_VERSION = 1;

    public DatabaseHelper(Context context) {
        super(context, DATABASE_NAME, null, DATABASE_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase database, ConnectionSource connectionSource) {
        try {
            TableUtils.createTable(connectionSource, User.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    @Override
    public void onUpgrade(SQLiteDatabase database, ConnectionSource connectionSource, int oldVersion, int newVersion) {
        try {
            TableUtils.dropTable(connectionSource, User.class, true);
            onCreate(database, connectionSource);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }
}

Dao类：

public class UserDao {
    private Dao<User, Integer> userDao;

    public UserDao(Context context) {
        try {
            userDao = new DaoManager().getDao(context, User.class);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public void add(User user) {
        try {
            userDao.create(user);
        } catch (SQLException e) {
            e.printStackTrace();
        }
    }

    public User queryById(int id) {
        User user = null;
        try {
            user = userDao.queryForId(id);
        } catch (SQLException e) {
            e.printStackTrace