MyDatabaseHelper class with crud opration

JavaScript

import android.content.ContentValues;
import android.content.Context;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

import java.util.ArrayList;
import java.util.List;

public class MyDatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "mydatabase.db";
    private static final int DATABASE_VERSION = 1;

    private static final String TABLE_NAME = "mytable";
    private static final String COLUMN_ID = "_id";
    private static final String COLUMN_NAME = "name";
    private static final String COLUMN_AGE = "age";

    private static final String CREATE_TABLE =
        "CREATE TABLE " + TABLE_NAME + " (" +
        COLUMN_ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
        COLUMN_NAME + " TEXT, " +
        COLUMN_AGE + " INTEGER);";

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

    @Override
    public void onCreate(SQLiteDatabase db) {
        db.execSQL(CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME);
        onCreate(db);
    }

    public long insertData(String name, int age) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, name);
        values.put(COLUMN_AGE, age);
        long id = db.insert(TABLE_NAME, null, values);
        db.close();
        return id;
    }

    public List<Person> getAllData() {
        List<Person> persons = new ArrayList<>();
        SQLiteDatabase db = this.getReadableDatabase();
        Cursor cursor = db.rawQuery("SELECT * FROM " + TABLE_NAME, null);
        if (cursor.moveToFirst()) {
            do {
                Person person = new Person();
                person.setId(cursor.getInt(cursor.getColumnIndex(COLUMN_ID)));
                person.setName(cursor.getString(cursor.getColumnIndex(COLUMN_NAME)));
                person.setAge(cursor.getInt(cursor.getColumnIndex(COLUMN_AGE)));
                persons.add(person);
            } while (cursor.moveToNext());
        }
        cursor.close();
        db.close();
        return persons;
    }

    public int updateData(int id, String name, int age) {
        SQLiteDatabase db = this.getWritableDatabase();
        ContentValues values = new ContentValues();
        values.put(COLUMN_NAME, name);
        values.put(COLUMN_AGE, age);
        int count = db.update(TABLE_NAME, values, COLUMN_ID + " = ?",
                new String[]{String.valueOf(id)});
        db.close();
        return count;
    }

    public int deleteData(int id) {
        SQLiteDatabase db = this.getWritableDatabase();
        int count = db.delete(TABLE_NAME, COLUMN_ID + " = ?",
                new String[]{String.valueOf(id)});
        db.close();
        return count;
    }
}

public class Person {
        private int id;
        private String name;
        private int age;

        public Person() {
        }

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