如何在flutter中从SQLite中获取数据？

dependencies:
  sqflite: ^2.0.0+3
  path_provider: ^2.0.2

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

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

  static final table = 'my_table';
  static final columnId = '_id';
  static final columnName = 'name';

  // 单例模式
  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 {
    var documentsDirectory = await getApplicationDocumentsDirectory();
    var path = join(documentsDirectory.path, _databaseName);
    return await openDatabase(path,
        version: _databaseVersion, onCreate: _onCreate);
  }

  Future<void> _onCreate(Database db, int version) async {
    await db.execute('''
          CREATE TABLE $table (
            $columnId INTEGER PRIMARY KEY,
            $columnName TEXT NOT NULL
          )
          ''');
  }

  Future<int> insert(String name) async {
    Database db = await instance.database;
    return await db.insert(table, {columnName: name});
  }

  Future<List<Map<String, dynamic>>> queryAllRows() async {
    Database db = await instance.database;
    return await db.query(table);
  }
}

Future<List<Map<String, dynamic>>> getDataFromSQLite() async {
  List<Map<String, dynamic>> result = await DatabaseHelper.instance.queryAllRows();
  return result;
}