如何在Flutter中使用SQFLITE从数据库开始加载app中的数据？

dependencies:
  sqflite: ^2.0.0+4

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

class DatabaseHelper {
  static final DatabaseHelper _instance = DatabaseHelper.internal();

  factory DatabaseHelper() => _instance;

  static Database? _database;

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

  DatabaseHelper.internal();

  Future<Database> initDatabase() async {
    String databasesPath = await getDatabasesPath();
    String path = join(databasesPath, 'app_data.db');
    return await openDatabase(
      path,
      version: 1,
      onCreate: _onCreate,
    );
  }

  void _onCreate(Database db, int version) async {
    await db.execute('CREATE TABLE IF NOT EXISTS data (id INTEGER PRIMARY KEY, name TEXT)');
  }

  Future<List<Map<String, dynamic>>> getData() async {
    Database? db = await database;
    return db!.query('data');
  }
}

class MyApp extends StatelessWidget {
  final dbHelper = DatabaseHelper();

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      title: 'Flutter SQFLite Demo',
      home: Scaffold(
        appBar: AppBar(
          title: Text('Flutter SQFLite Demo'),
        ),
        body: Center(
          child: FutureBuilder<List<Map<String, dynamic>>>(
            future: dbHelper.getData(),
            builder: (BuildContext context, AsyncSnapshot<List<Map<String, dynamic>>> snapshot) {
              if (snapshot.hasData) {
                return ListView.builder(
                  itemCount: snapshot.data!.length,
                  itemBuilder: (BuildContext context, int index) {
                    return ListTile(
                      title: Text(snapshot.data![index]['name']),
                    );
                  },
                );
              } else {
                return CircularProgressIndicator();
              }
            },
          ),
        ),
      ),
    );
  }
}