sqflite

问题 I am making an app, which contains two basic classes let's say Class1 and Class2 . And in Class1 I stored List<Class2> as attribute with other attributes. My question is how to store List<Class2> if I store some object of Class1 in sqflite database. Is there a way that I can store a List of Class2 objects in a single column of the database. 回答1: You can serialize it to json and save the string. Then when you read it you can parse it back to an Object 来源： https://stackoverflow.com/questions

问题 I am making an app, which contains two basic classes let's say Class1 and Class2 . And in Class1 I stored List<Class2> as attribute with other attributes. My question is how to store List<Class2> if I store some object of Class1 in sqflite database. Is there a way that I can store a List of Class2 objects in a single column of the database. 回答1: You can serialize it to json and save the string. Then when you read it you can parse it back to an Object 来源： https://stackoverflow.com/questions

问题 I am making an app, which contains two basic classes let's say Class1 and Class2 . And in Class1 I stored List<Class2> as attribute with other attributes. My question is how to store List<Class2> if I store some object of Class1 in sqflite database. Is there a way that I can store a List of Class2 objects in a single column of the database. 回答1: You can serialize it to json and save the string. Then when you read it you can parse it back to an Object 来源： https://stackoverflow.com/questions

问题 I'm trying to use floor database but when i want to build database i got below error : E/flutter (26007): [ERROR:flutter/lib/ui/ui_dart_state.cc(157)] Unhandled Exception: MissingPluginException(No implementation found for method getDatabasesPath on channel com.tekartik.sqflite) E/flutter (26007): #0 MethodChannel._invokeMethod (package:flutter/src/services/platform_channel.dart:154:7) E/flutter (26007): <asynchronous suspension> E/flutter (26007): #1 MethodChannel.invokeMethod (package

问题 I have a flutter app using sqflite database. It works perfectly on android emulator and device, also working on ios simulator. on ios real device it works but does not save or retrieve data just static empty UI I use xcode 10.1, and ios 11.2.6 on iphone 6 and ios 12.1.4 on iphone 5s. import 'package:sqflite/sqflite.dart'; import 'dart:async'; import 'dart:io'; import 'package:path_provider/path_provider.dart'; import 'package:flutter_app/models/note.dart'; class DatabaseHelper { static

问题 I have a flutter app using sqflite database. It works perfectly on android emulator and device, also working on ios simulator. on ios real device it works but does not save or retrieve data just static empty UI I use xcode 10.1, and ios 11.2.6 on iphone 6 and ios 12.1.4 on iphone 5s. import 'package:sqflite/sqflite.dart'; import 'dart:async'; import 'dart:io'; import 'package:path_provider/path_provider.dart'; import 'package:flutter_app/models/note.dart'; class DatabaseHelper { static

问题 I have the following code Future<InitData> getInitialData() async { print('OPENING'); await open(); print('DB = $_db ${_db.isOpen}'); final rawDayActionTypes = await _db.query(...); Where function open is the following Future<Database> open() async { if (_db != null && _db.isOpen) { return _db; } final dbPath = await sql.getDatabasesPath(); final myDBPath = path.join(dbPath, db_name); _db = await sql.openDatabase(myDBPath, onCreate: _onCreateDB, version: 1); return _db; } But after a hot

来源： https://stackoverflow.com/questions/55353469/store-complex-type-in-flutter-sqflite

问题 I have a flutter app where I use a sqflite DB storage. I create a DB as pointed in the sqflite example - I use getDatabasesPath() as a relative path to the app and then var db = await openDatabase(path_to_db_file); . Everything works fine, I can create tables, work with data and so on. I face a problem when I uninstall the app. While still in development I need to add more tables, purge data, change column names, etc. I want after I uninstall the app, to delete all the files associated with

问题 How do you query data from SQLite database in Flutter using the SQFlite plugin? I have been working on learning this recently, so I am adding my answer below as a means to help me learn and also as a quick reference for others in the future. 回答1: Add the dependencies Open pubspec.yaml and in the dependencies section add the following lines: sqflite: ^1.0.0 path_provider: ^0.4.1 The sqflite is the SQFlite plugin of course and the path_provider will help us get the user directory on Android and