如何在Android中升级SQLite数据库？

public class DatabaseHelper extends SQLiteOpenHelper {
    private static final String DATABASE_NAME = "myDatabase.db";
    private static final int DATABASE_VERSION = 2;

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

    @Override
    public void onCreate(SQLiteDatabase db) {
        // 创建表结构
        String CREATE_TABLE = "CREATE TABLE my_table (_id INTEGER PRIMARY KEY, name TEXT)";
        db.execSQL(CREATE_TABLE);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // 在这里实现数据库的升级逻辑
    }
}

@Override
public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
    if (oldVersion < 2) {
        String CREATE_NEW_TABLE = "CREATE TABLE new_table (_id INTEGER PRIMARY KEY, age INTEGER)";
        db.execSQL(CREATE_NEW_TABLE);
    }
}

DatabaseHelper dbHelper = new DatabaseHelper(getApplicationContext());
SQLiteDatabase db = dbHelper.getWritableDatabase();

ContentValues values = new ContentValues();
values.put("name", "John");
db.insert("my_table", null, values);