iv_and/invoice_provider.dart

import 'package:flutter/material.dart';
import 'package:sqflite/sqflite.dart';
import 'db_helper.dart';
import 'invoice.dart';

class InvoiceProvider with ChangeNotifier {
  List<Invoice> _invoices = [];

  List<Invoice> get invoices => _invoices;

  Future<void> fetchInvoices() async {
    final db = await DbHelper().database;
    final List<Map<String, dynamic>> maps = await db.query('invoices');
    _invoices = List.generate(maps.length, (i) {
      return Invoice.fromMap(maps[i]);
    });
    notifyListeners();
  }

  Future<void> addInvoice(Invoice invoice) async {
    final db = await DbHelper().database;
    await db.insert('invoices', invoice.toMap());
    fetchInvoices();
  }

  // 追加の CRUD メソッドを実装
}