如何正确地将Sqlite数据库中的所有数据显示到ListView.builder中？

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

// 数据模型类
class DataItem {
  final int id;
  final String name;
  
  DataItem({required this.id, required this.name});
}

// 数据库帮助类
class DatabaseHelper {
  static final DatabaseHelper instance = DatabaseHelper._privateConstructor();
  static Database? _database;

  DatabaseHelper._privateConstructor();

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

  Future<Database> _initDatabase() async {
    String path = join(await getDatabasesPath(), 'database.db');
    return await openDatabase(path, version: 1, onCreate: _createTable);
  }

  Future<void> _createTable(Database db, int version) async {
    await db.execute('''
      CREATE TABLE IF NOT EXISTS items (
        id INTEGER PRIMARY KEY,
        name TEXT
      )
    ''');
  }

  Future<List<DataItem>> getAllItems() async {
    final db = await database;
    final List<Map<String, dynamic>> maps = await db.query('items');
    return List.generate(maps.length, (i) {
      return DataItem(id: maps[i]['id'], name: maps[i]['name']);
    });
  }
}

// Flutter界面
class MyListView extends StatefulWidget {
  @override
  _MyListViewState createState() => _MyListViewState();
}

class _MyListViewState extends State<MyListView> {
  late Future<List<DataItem>> _items;

  @override
  void initState() {
    super.initState();
    _items = DatabaseHelper.instance.getAllItems();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Text('ListView from Sqlite'),
      ),
      body: FutureBuilder<List<DataItem>>(
        future: _items,
        builder: (BuildContext context, AsyncSnapshot<List<DataItem>> 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 if (snapshot.hasError) {
            return Text('Error: ${snapshot.error}');
          } else {
            return Center(child: CircularProgressIndicator());
          }
        },
      ),
    );
  }
}

// 示例入口函数
void main() {
  runApp(MaterialApp(
    home: MyListView(),
  ));
}