hive 0.5.0

Lightweight and blazing fast key-value database written in pure Dart. Stronly encrypted using AES-256.

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

• Documentation 📖
• Frequently Asked Questions 🙋
• Samples 🔥

Hive is not ready for production yet. I'm working hard on a stable version.

Flutter Web Demos 🕸️

• Counter
• Sketchpad
• Todo App

Features

Cross-platform ⚡

• Runs on desktop, mobile & in browser
• Very good performance (see benchmark)

Easy to use ❤️

• Keys are ints or Strings and values are arbitrary objects
• The basic operations are put(key, value), get(key), delete(key)
• Strong encryption built in

Lightweight 🎈

• Small runtime
• Small disk space consumption
• NO native dependencies

Benchmark

Read 1000 entries	Write 1000 entries
SharedPreferences is on par with Hive when it comes to read performance. SQLite performs much worse.	Hive greatly outperforms SQLite and SharedPreferences when it comes to writing or deleting.

This benchmark was performed on a Oneplus 6T with Android Q. All entries are read and written one after another. You can run the benchmark yourself.

Getting Started

Initialize

Hive needs a directory where it can store its data. Call Hive.init() the first time you use Hive.

Hive.init('path/to/hive');

In the browser you don't have to call init().

Open a Box

All of your data is stored in boxes.

var box = await Hive.openBox('testBox');

Just provide an encryptionKey to encrypt a box:

var key = Hive.generateSecureKey();
var box = await Hive.openBox('secureBox', encryptionKey: key);

Read & Write

Hive supports all primitive types, List, Map, DateTime and Uint8List. Any object can be can stored using TypeAdapters

var dog = Dog(name: 'Nero', age: 4);

box.put('myDog', dog);

Dog myDog = box.get('myDog');

Hive ❤️ Flutter

Hive was written with Flutter in mind. It is a perfect fit if you need a lightweight datastore for your app. Here is a sample how that may look like:

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

Boxes are cached and therefore fast enough to be used directly in the build() method of Flutter widgets.

Todo

The work on Hive has just started. If you want to contribute, it would be amazing if you helped me with one of these:

• ✅ Good test coverage
• ✅ Many examples, especially for Flutter
• ✅ Benchmarks and comparison
• ❌ Finalize API
• ❌ Improve documentation
• ❌ Write binary format spec
• ❌ Even more tests

Licence

Copyright 2019 Simon Leier

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

   http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.