Flutter Mobile Development · 课时

Hive 与 NoSQL 本地存储

学习使用 Hive——面向 Flutter 的高速键值 NoSQL 数据库——在本地持久化结构化对象，无需 SQL。

Hive 与 NoSQL 本地存储 是 CoddyKit 上的免费 Flutter Mobile Development 课时。这是第 4 节课，共 4 节。你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。这是 Flutter Mobile Development 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Flutter Mobile Development 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Why Hive?

Hive is a lightweight, pure-Dart key-value database. It is great when SQLite feels heavy and SharedPreferences feels too simple.

Very fast reads and writes
No native dependencies
Stores Dart objects directly

Adding Hive

Add the packages to pubspec.yaml: hive, hive_flutter, and dev dependencies hive_generator and build_runner.

dependencies:
  hive: ^2.2.3
  hive_flutter: ^1.1.0
dev_dependencies:
  hive_generator: ^2.0.1
  build_runner: ^2.4.0

Initializing Hive

Initialize Hive before runApp so the database directory is ready.

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Hive.initFlutter();
  runApp(const MyApp());
}

Boxes

Data lives in a Box — think of it as a typed map persisted to disk. Open one before use.

final box = await Hive.openBox('settings');

Reading & Writing

Use put and get like a map. Values survive app restarts.

box.put('darkMode', true);
final isDark = box.get('darkMode', defaultValue: false);

Storing Custom Objects

To store your own classes, annotate them with @HiveType and each field with @HiveField.

@HiveType(typeId: 0)
class Note extends HiveObject {
  @HiveField(0)
  String title;
  @HiveField(1)
  String body;
  Note(this.title, this.body);
}

Generating Adapters

Run the code generator to create the type adapter, then register it.

// terminal:
// flutter pub run build_runner build

Hive.registerAdapter(NoteAdapter());

Working with a Typed Box

Open a box typed to your class to store and retrieve objects directly.

final notes = await Hive.openBox<Note>('notes');
notes.add(Note('Shopping', 'Milk and eggs'));
final first = notes.getAt(0);

Updating & Deleting

Because a HiveObject remembers its box, you can call save and delete on the object itself.

final note = notes.getAt(0)!;
note.title = 'Updated';
note.save();
note.delete();

Reactive UI with ValueListenable

Hive boxes expose a listenable, so ValueListenableBuilder rebuilds the UI when data changes.

ValueListenableBuilder(
  valueListenable: notes.listenable(),
  builder: (context, Box<Note> box, _) {
    return Text('Notes: ' + box.length.toString());
  },
);

Hive vs SQLite

Choose Hive for simple object/key-value storage and speed. Choose SQLite when you need complex relational queries, joins or aggregations.

Quick Check

What must you do before storing a custom class in a Hive box?

Recap

You learned Hive for local NoSQL storage:

initFlutter and boxes
put/get key-value access
Custom objects with generated adapters
Reactive UI via box listenables

Hive gives you fast, structured persistence without SQL.

常见问题解答

「Hive 与 NoSQL 本地存储」课时是免费的吗？

是的 — 「Hive 与 NoSQL 本地存储」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Flutter Mobile Development 课程的其余内容，请升级到 CoddyKit PRO。 Flutter Mobile Development 课程共包含 4 节课。

「Hive 与 NoSQL 本地存储」这节课中我会学到什么？

学习使用 Hive——面向 Flutter 的高速键值 NoSQL 数据库——在本地持久化结构化对象，无需 SQL。你通过在浏览器中直接运行的动手代码来练习 Flutter Mobile Development，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Flutter Mobile Development 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Flutter Mobile Development 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。这是第 4 节课，共 4 节。

「Hive 与 NoSQL 本地存储」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Flutter Mobile Development 课中编写并运行代码吗？

能。每节 Flutter Mobile Development 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

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