플러터 프로그래밍 _openConnection 오류
해결됨
오류한줄이 해결이 안되서 문의드립니다. 코드팩토리의 플러터프로그래밍 2판 18장입니다. database폴더안의 drift_database.dart에서 _openConnection()부분이 오류로 뜹니다. 해당 내용은 The instance member '_openConnection' can't be accessed in an initializer. 입니다 main.dart import 'package:calendar_scheduler2/screen/home_screen.dart'; import 'package:flutter/material.dart'; import 'package:intl/date_symbol_data_local.dart'; import 'package:calendar_scheduler2/database/drift_database.dart'; import 'package:get_it/get_it.dart'; void main() async { WidgetsFlutterBinding.ensureInitialized(); await initializeDateFormatting(); final database = LocalDatabase(); GetIt.I.registerSingleton<LocalDatabase>(database); runApp( MaterialApp( home: HomeScreen(), ), ); } schedule_bottom_sheet.dart import 'package:calendar_scheduler2/component/custom_text_field.dart'; import 'package:calendar_scheduler2/const/colors.dart'; import 'package:flutter/material.dart'; import 'package:drift/drift.dart' hide Column; import 'package:get_it/get_it.dart'; import 'package:calendar_scheduler2/database/drift_database.dart'; class ScheduleBottomSheet extends StatefulWidget { final DateTime selectedDate; const ScheduleBottomSheet({ required this.selectedDate,Key? key}) : super(key: key); @override State<ScheduleBottomSheet> createState() => _ScheduleBottomSheetState(); } class _ScheduleBottomSheetState extends State<ScheduleBottomSheet> { final GlobalKey<FormState> formKey = GlobalKey(); int? startTime; int? endTime; String? content; @override Widget build(BuildContext context) { final bottomInset = MediaQuery.of(context).viewInsets.bottom; return Form( key: formKey, child: SafeArea( child: Container( height: MediaQuery.of(context).size.height / 2 + bottomInset, color: Colors.white, child: Padding( padding: EdgeInsets.only( left: 8, right: 8, top: 8, bottom: bottomInset), child: Column( children: [ Row( children: [ Expanded( child: CustomTextField( label: '시작 시간', isTime: true, onSaved: (String? val) { startTime = int.parse(val!); }, validator: timeValidator, ), ), const SizedBox(width: 16.0), Expanded( child: CustomTextField( label: '종료 시간', isTime: true, onSaved: (String? val) { endTime = int.parse(val!); }, validator: timeValidator, ), ), ], ), SizedBox(height: 8.0), Expanded( child: CustomTextField( label: '내용', isTime: false, onSaved: (String? val) { content = val; }, validator: contentValidator, ), ), SizedBox( width: double.infinity, child: ElevatedButton( onPressed: onSavePressed, style: ElevatedButton.styleFrom( backgroundColor: PRIMARY_COLOR, ), child: Text('저장'), ), ), ], ), ), ), ), ); } void onSavePressed() async { if (formKey.currentState!.validate()){ formKey.currentState!.save(); await GetIt.I<LocalDatabase>().createSchedule( SchedulesCompanion( startTime: Value(startTime!), endTime: Value(endTime!), content: Value(content!), date: Value(widget.selectedDate), ), ); Navigator.of(context).pop(); } } String? timeValidator(String? val) { if (val == null) { return '값을 입력해주세요'; } int? number; try { number = int.parse(val); } catch (e) { return '숫자를 입력해주세요'; } if (number < 0 || number > 24) { return '0시부터 24시 사이를 입력해주세요'; } return null; } String? contentValidator(String? val) { if (val == null || val.length == 0) { return '값을 입력해주세요'; } return null; } } drift_database.dart import 'package:calendar_scheduler2/model/schedule.dart'; import 'package:drift/drift.dart'; import 'package:drift/native.dart'; import 'package:path_provider/path_provider.dart'; import 'package:path/path.dart' as p; import 'dart:io'; part 'drift_database.g.dart'; @DriftDatabase( tables: [ Schedules, ], ) class LocalDatabase extends _$LocalDatabase { LocalDatabase() : super(_openConnection()); Stream<List<Schedule>> watchSchedules(DateTime date) => (select(schedules) ..where((tbl) => tbl.date.equals(date))).watch(); LazyDatabase _openConnection() { return LazyDatabase(() async { final dbFolder = await getApplicationDocumentsDirectory(); final file = File(p.join(dbFolder.path, 'db.sqlite')); return NativeDatabase(file); }); } Future<int> createSchedule(SchedulesCompanion data) => into(schedules).insert(data); Future<int> removeSchedule(int id) => (delete(schedules) ..where((tbl) => tbl.id.equals(id))).go(); @override int get schemaVersion => 1; }
- 플러터프로그래밍
- openconnection