leveldb 3.0.0

LevelDB dart bindings

Fast & simple storage - a Dart LevelDB wrapper

Introduction

LevelDB is a simple key/value data store built by Google, inspired by BigTable. It's used in Google Chrome and many other products. LevelDB supports arbitrary byte arrays as both keys and values, singular get, put and delete operations, batched put and delete, bi-directional iterators and simple compression using the very fast Snappy algorithm.

leveldb_dart aims to expose the features of LevelDB in a Dart-friendly way.

LevelDB stores entries sorted lexicographically by keys. This makes LevelDB.getItems a very powerful query mechanism.

Platform Support

Only linux 64-bit platform is supported. The following distributions have been tested:

• Fedora 25
• Ubuntu 14.04
• Ubuntu 15.10

If your platform works and is not listed please let me know so I can add it.

Basic usage

Add leveldb to your pubspec.yaml file.

name: myproject
dependencies:
  leveldb:

Open a database and read/write some keys and values..

import 'dart:async';
import 'package:leveldb/leveldb.dart';

Future main() async {
  LevelDB<String, String> db = await LevelDB.openUtf8("/tmp/testdb");
  db.put("abc", "def");
  String value = db.get("abc");
  print("value is $value"); // value2 is def
}

Check out example/main.dart to see how to read, write and iterate over keys and values.

Documentation

API Documentation is available at https://www.dartdocs.org/documentation/leveldb/latest/

Isolates (Threads)

leveldb_dart supports access to a database from multiple isolates by passing shared: true to the LevelDB.open function. The LevelDB object returned by this function will share an underlying reference to the object in other isolates and changes will be visible between isolates.

See example/isolate.dart for an example of using a database from multiple isolates (OS threads).

Feature Support

• Read and write keys
• Forward iteration
• Multi-isolate
• Backward iteration
• Snapshots
• Bulk get / put