md-siam/hive_crud

This repo will teach you how to use hive package for storing data locally in your device. Hive is a lightweight and blazing fast key-value database written in pure Dart.

           

Hive CRUD - KindaCode

Introduction to Hive: This repo will teach you how to use hive package for storing data locally in your device. Hive is a lightweight and blazing fast key-value database written in pure Dart.

To use hive, add the following packages to your pubspec.yaml file:

dependencies:
  # For NoSQL Database
  hive: ^2.2.3
  # Extension for hive
  hive_flutter: ^1.1.0

dev_dependencies:
  # For hive
  hive_generator: ^1.1.3
  build_runner: ^2.2.0

App Demo

Hive CRUD

Create: home_page.dart

  List<Map<String, dynamic>> _items = [];
  final _shoppingBox = Hive.box('shopping_box');

  // Create new item
  Future<void> _createItem(Map<String, dynamic> newItem) async {
    await _shoppingBox.add(newItem);
    _refreshItems(); // update the UI
  }

Read: home_page.dart

  // Get all items from the database
  void _refreshItems() {
    final data = _shoppingBox.keys.map((key) {
      final value = _shoppingBox.get(key);
      return {"key": key, "name": value["name"], "quantity": value['quantity']};
    }).toList();

    setState(() {
      _items = data.reversed.toList();
      // we use "reversed" to sort items in order from the latest to the oldest
    });
  }

  // Retrieve a single item from the database by using its key
  // Our app won't use this function but I put it here for your reference
  // ignore: unused_element
  Map<String, dynamic> _readItem(int key) {
    final item = _shoppingBox.get(key);
    return item;
  }

Update: home_page.dart

  // Update a single item
  Future<void> _updateItem(int itemKey, Map<String, dynamic> item) async {
    await _shoppingBox.put(itemKey, item);
    _refreshItems(); // Update the UI
  }

Delete: home_page.dart

  // Delete a single item
  Future<void> _deleteItem(int itemKey) async {
    await _shoppingBox.delete(itemKey);
    _refreshItems(); // update the UI

    // Display a snackbar
    // ignore: use_build_context_synchronously
    ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('An item has been deleted')));
  }

File Pattern Inside The lib Folder

lib
├── views
│   └── home_page.dart
└── main.dart