如何更新版本数据库SQFLite flutter？

dependencies:
  sqflite: ^2.0.0

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

final database = openDatabase(
  join(await getDatabasesPath(), 'my_database.db'),
  onCreate: (db, version) {
    // 创建数据库表
  },
  onUpgrade: (db, oldVersion, newVersion) {
    // 更新数据库表结构或数据
  },
  version: 2, // 指定数据库版本号
);

onUpgrade: (db, oldVersion, newVersion) async {
  if (oldVersion < 2) {
    await db.execute('CREATE TABLE IF NOT EXISTS new_table (id INTEGER PRIMARY KEY, name TEXT)');
  }
  if (oldVersion < 3) {
    await db.execute('ALTER TABLE existing_table ADD COLUMN new_column TEXT');
  }
},

final database = openDatabase(
  join(await getDatabasesPath(), 'my_database.db'),
  onCreate: (db, version) {
    // 创建数据库表
  },
  onUpgrade: (db, oldVersion, newVersion) {
    // 更新数据库表结构或数据
  },
  version: 3, // 更新数据库版本号为3
);