hive_io 3.0.1

Fork of the original hive project. Updated to support latest versions of Dart and Flutter!

hive_io

Hive is a lightweight and blazing fast key-value database written in pure Dart.

• 🚀 Built for mobile and desktop
• 🔒 Encryption built in
• 🎈 No native dependencies

👉 The original Hive project is abandoned. Hive_IO is a clone (minus web support) to keep everything working with newer versions of Flutter and Dart. I'm not planning to add any new features. Checkout hive_ce if you're looking for:

• Multi-isolate support
• Web support
• New feature development

Getting started

Follow this guide to get started with Hive in your Flutter app!

Install dependencies

Add the hive_io packages to your pubspec.yaml

dependencies:
  hive_io: ^3.0.0
  hive_flutter: ^3.0.0

dev_dependencies:
  hive_generator_io: ^3.0.0

Generate type adapters

Hive supports primitives, lists, maps, and any Dart object you want. However, you will need to generate a type adapter before you can store objects.

Here is an example:

@HiveType(typeId: 0)
class Person {

  @HiveField(0)
  int id;

  @HiveField(1)
  String? name;

  @HiveField(2, defaultValue: false)
  bool isVIP;

  Person({
    required this.id, 
    this.name, 
    this.isVIP = false,
  });
}

Run build_runner to generate Hive types:

dart run build_runner build --delete-conflicting-outputs

Initialize Hive

Initialize hive in the main function of your app:

Future<void> main() async {
  ...

  // Initialize Hive. This MUST be called first.
  await Hive.initFlutter(null);

  // Register all of your type adapters next.
  Hive.registerAdapter(PersonAdapter());

  // Box needs to be opened before you can interact with it.
  await Hive.openBox<Person>('person');

  ...

  runApp(App());
}

Using boxes

You can use a Hive box just like a map. It is not necessary to await Futures.

final box = Hive.box<Person>('person');

box.put('123', Person(id: '123', name: 'David'));

final person = box.get('123');

Listen to box changes

You can use ValueListenableBuilder to listen for changes to a box and then update your widgets.

import 'package:hive_io/hive_io.dart';
import 'package:hive_flutter_io/hive_flutter_io.dart';

class SettingsPage extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return ValueListenableBuilder(
      valueListenable: Hive.box('settings').listenable(),
      builder: (context, box, widget) {
        return Switch(
          value: box.get('darkMode'),
          onChanged: (val) {
            box.put('darkMode', val);
          }
        );
      },
    );
  }
}