如何使用for循环从sqflite数据库计算总数，并使用将来的构建器将其打印出来？

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

void calculateAndPrintTotal() async {
  // 打开数据库
  final database = openDatabase(
    join(await getDatabasesPath(), 'your_database.db'),
  );

  // 查询数据库中的数据并计算总数
  final total = await database.then((db) => db.query('your_table')).then((rows) => rows.length);

  // 打印总数
  print('Total: $total');
}

@override
Widget build(BuildContext context) {
  return FutureBuilder(
    future: calculateAndPrintTotal(),
    builder: (context, snapshot) {
      if (snapshot.connectionState == ConnectionState.done) {
        return Center(
          child: Text('Total: ${snapshot.data}'),
        );
      } else {
        return CircularProgressIndicator();
      }
    },
  );
}