flutter_local_db

A high-performance cross-platform local database for Dart and Flutter applications using Rust + LMDB via FFI.

flutter_local_db

Features

  • 🚀 High-performance: LMDB backend with Rust implementation
  • 🦀 Rust-powered: Memory-safe native performance
  • 📱 Cross-platform: Android, iOS, macOS, Linux, Windows
  • 💾 Simple API: Key-value interface with CRUD operations
  • 🛡️ Type-safe: Result-based error handling
  • ✨ Easy to use: Single file, zero configuration

Installation

Add to your pubspec.yaml:

dependencies:
  flutter_local_db: ^1.1.0

Usage

import 'package:flutter_local_db/flutter_local_db.dart';

void main() async {
  // Initialize the database
  await LocalDB.init('my_database');
  
  // Create a record
  final result = await LocalDB.Post('user_1', {
    'name': 'John Doe',
    'email': 'john@example.com',
    'age': 30
  });
  
  result.when(
    ok: (model) => print('Created: ${model.id}'),
    err: (error) => print('Error: $error'),
  );
  
  // Get a record
  final getResult = await LocalDB.GetById('user_1');
  final user = getResult.unwrapOr(null);
  print('User: $user');
  
  // Update a record
  await LocalDB.Put('user_1', {
    'name': 'Jane Doe',
    'email': 'jane@example.com',
    'age': 25
  });
  
  // Get all records
  final allResult = await LocalDB.GetAll();
  allResult.when(
    ok: (models) => print('Total records: ${models.length}'),
    err: (error) => print('Error: $error'),
  );
  
  // Delete a record
  await LocalDB.Delete('user_1');
  
  // Clear all data
  await LocalDB.ClearData();
  
  // Close database (optional)
  await LocalDB.close();
}

Platform Setup

This package uses FFI to load native Rust libraries. The required binaries are included.

Android

The Flutter plugin automatically includes the native libraries for all architectures. No additional setup required.

iOS

The iOS plugin includes the static library via Cocoapods. No additional setup required.

Desktop

Desktop platforms (macOS, Linux, Windows) automatically include the native libraries via their respective build systems. No additional setup required.

API Reference

Result Type

All database operations return LocalDbResult<T, E> for type-safe error handling:

result.when(
  ok: (value) => handleSuccess(value),
  err: (error) => handleError(error),
);

// Or use convenience methods
final value = result.unwrapOr(defaultValue);
final maybeValue = result.okOrNull;

Error Handling

Errors are typed for better handling:

result.when(
  ok: (model) => print('Success: $model'),
  err: (error) {
    switch (error.type) {
      case LocalDbErrorType.notFound:
        print('Record not found');
        break;
      case LocalDbErrorType.validation:
        print('Invalid key: ${error.message}');
        break;
      case LocalDbErrorType.database:
        print('Database error: ${error.message}');
        break;
    }
  },
);

Performance

  • Fast: Direct FFI calls to optimized Rust code
  • Memory efficient: LMDB memory-mapped storage
  • Minimal overhead: Single file, no complex abstractions
  • Production ready: Used in multiple production applications

Limitations

  • Data must be JSON-serializable
  • IDs must follow the format requirements
  • Platform-specific limitations may apply
  • Currently no support for complex queries or indexing
  • No automatic migration system
  • Database name is standardized (no custom naming allowed)

Contributing

Contributions are welcome! The project uses a dual-language architecture:

  • Flutter/Dart for the high-level API and FFI bridge
  • Rust for the core database operations

Please ensure you have both Rust and Flutter development environments set up before contributing.

License

MIT License - see LICENSE

Author

Made with ❤️ by JhonaCode

Libraries

flutter_local_db