Hive

var box = Hive.box('myBox');

box.put('name', 'David');

var name = box.get('name');

print('Name: $name');

import 'package:hive/hive.dart';

class HiveService {
  Future<Box> openBox(String boxName) async {
    return await Hive.openBox(boxName);
  }

  Future<void> closeBox(Box box) async {
    await box.close();
  }
}

class HiveCreateService extends HiveService {
  Future<void> create(String boxName, String key, dynamic value) async {
    var box = await openBox(boxName);
    await box.put(key, value);
    await closeBox(box);
  }
}

class HiveReadService extends HiveService {
  Future<dynamic> read(String boxName, String key) async {
    var box = await openBox(boxName);
    var value = box.get(key);
    await closeBox(box);
    return value;
  }
}

class HiveUpdateService extends HiveService {
  Future<void> update(String boxName, String key, dynamic value) async {
    var box = await openBox(boxName);
    await box.put(key, value);
    await closeBox(box);
  }
}

class HiveDeleteService extends HiveService {
  Future<void> delete(String boxName, String key) async {
    var box = await openBox(boxName);
    await box.delete(key);
    await closeBox(box);
  }
}

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

// 儲存字串
await box.put('myString', 'Hello, World!');

// 儲存數字
await box.put('myNumber', 42);

// 儲存布林值
await box.put('myBool', true);

// 儲存列表
await box.put('myList', [1, 2, 3]);

// 儲存地圖
await box.put('myMap', {'key': 'value'});

await box.close();

// Create a box collection
  final collection = await BoxCollection.open(
    'MyFirstFluffyBox', // Name of your database
    {'cats', 'dogs'}, // Names of your boxes
    path: './', // Path where to store your boxes (Only used in Flutter / Dart IO)
    key: HiveCipher(), // Key to encrypt your boxes (Only used in Flutter / Dart IO)
  );

  // Open your boxes. Optional: Give it a type.
  final catsBox = collection.openBox<Map>('cats');

  // Put something in
  await catsBox.put('fluffy', {'name': 'Fluffy', 'age': 4});
  await catsBox.put('loki', {'name': 'Loki', 'age': 2});

  // Get values of type (immutable) Map?
  final loki = await catsBox.get('loki');
  print('Loki is ${loki?['age']} years old.');

  // Returns a List of values
  final cats = await catsBox.getAll(['loki', 'fluffy']);
  print(cats);

  // Returns a List<String> of all keys
  final allCatKeys = await catsBox.getAllKeys();
  print(allCatKeys);

  // Returns a Map<String, Map> with all keys and entries
  final catMap = await catsBox.getAllValues();
  print(catMap);

  // delete one or more entries
  await catsBox.delete('loki');
  await catsBox.deleteAll(['loki', 'fluffy']);

  // ...or clear the whole box at once
  await catsBox.clear();

  // Speed up write actions with transactions
  await collection.transaction(
    () async {
      await catsBox.put('fluffy', {'name': 'Fluffy', 'age': 4});
      await catsBox.put('loki', {'name': 'Loki', 'age': 2});
      // ...
    },
    boxNames: ['cats'], // By default all boxes become blocked.
    readOnly: false,
  );