Hive is a lightweight and blazing fast key-value store written in pure Dart. Inspired by Bitcask.
- Documentation ๐
- Frequently Asked Questions ๐
- Samples ๐ฅ
Hive is not ready for production yet. I'm working hard on a stable version.
- More than twice the speed of other datastores
- Binary data format
- Supports all types
- Strong encryption built in
- Runs on desktop, mobile & in browser
- Small runtime
- NO native dependencies
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.
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()
.
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);
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 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 HiveBuilder.openBox(
openBox: () {
return Hive.openBox('settings');
},
builder: (context, box) {
return Switch(
value: box.get('darkMode'),
onChanged: (val) {
box.put('darkMode', val);
}
)
},
child: Center(
// Shown when app starts until Hive is ready
child: Text('Please wait...'),
),
);
}
}
Boxes are cached and therefore fast enough to be used directly in the build()
method of Flutter widgets.
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
- Finalize API
- Improve documentation
- Write binary format spec
- Even more tests
- Benchmarks and comparison
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.