如何在Flutter中处理sqlite数据库版本控制？

dependencies:
  sqflite: ^2.0.0

import 'package:sqflite/sqflite.dart';
import 'package:path/path.dart';

class DatabaseHelper {
  static final _databaseName = "my_database.db";
  static final _databaseVersion = 1;

  DatabaseHelper._privateConstructor();
  static final DatabaseHelper instance = DatabaseHelper._privateConstructor();

  static Database? _database;

  Future<Database> get database async {
    if (_database != null) return _database!;
    _database = await _initDatabase();
    return _database!;
  }

  Future<Database> _initDatabase() async {
    String path = join(await getDatabasesPath(), _databaseName);
    return await openDatabase(
      path,
      version: _databaseVersion,
      onCreate: _onCreate,
      onUpgrade: _onUpgrade,
    );
  }

  Future<void> _onCreate(Database db, int version) async {
    // 创建数据库表
    await db.execute('''
      CREATE TABLE my_table (
        id INTEGER PRIMARY KEY,
        name TEXT
      )
    ''');
  }

  Future<void> _onUpgrade(Database db, int oldVersion, int newVersion) async {
    // 数据库升级逻辑
    if (oldVersion < 2) {
      // 执行升级操作
    }
  }
}

Database db = await DatabaseHelper.instance.database;