如何使用 Customer TypeAdapter (Hive/Flutter)？

问题描述

我不太确定如何在 Flutter 中使用 Hive DB。我的意思是我有一个 ```WooCustomer```` 模型类，我想将它存储在本地（一旦客户登录）。

我的问题是，我必须将 WooCustomer 转换为 HiveObject 然后创建 TypeAdapter 还是直接创建 TypeAdapter<WooCustomer>？

PS：WooCustomer 是一个外部包。

这是实现 TypeAdapter<WooCustomer> 的正确方法吗？

class DatabaseAdapterService extends TypeAdapter<WooCustomer> {
  @override
  final int typeId = 0;

  @override
  WooCustomer read(BinaryReader reader) {
    return WooCustomer()
      ..id = reader.read()
      ..username = reader.read()
      ..firstName = reader.read()
      ..lastName = reader.read()
      ..email = reader.read()
      ..password = reader.read()
      ..avatarUrl = reader.read()
      ..role = reader.read()
      ..dateCreated = reader.read()
      ..dateCreatedGmt = reader.read()
      ..dateModified = reader.read()
      ..dateModifiedGmt = reader.read()
      ..isPayingCustomer = reader.read()
      ..links = reader.read()
      ..MetaData = reader.read()
      ..billing = reader.read()
      ..shipping = reader.read();
  }

  @override
  void write(BinaryWriter writer,WooCustomer customer) {
    writer.write(customer.username);
    writer.write(customer.id);
    writer.write(customer.firstName);
    writer.write(customer.lastName);
    writer.write(customer.email);
    writer.write(customer.password);
    writer.write(customer.links);
    writer.write(customer.avatarUrl);
    writer.write(customer.role);
    writer.write(customer.MetaData);
    writer.write(customer.dateCreated);
    writer.write(customer.dateCreatedGmt);
    writer.write(customer.dateModified);
    writer.write(customer.dateModified);
    writer.write(customer.dateModifiedGmt);
    writer.write(customer.isPayingCustomer);
    writer.write(customer.billing);
    writer.write(customer.shipping);
  }
}

解决方法

是的，你总是可以做到的。 首先在pubspec.yaml 的依赖项中获取这些插件hive,hive_flutter。 并且在 pubspec 文件中还有一个 dev dependencies 部分添加，hive_generator: ^1.1.0 build_runner: ^2.0.1

你很高兴开始...... 首先以这种格式编写您的类，

import 'package:hive/hive.dart'; //import Hive

part 'weather_model.g.dart'; 
// Specify the Location of the type-adapter's Location (specifically)
//Add the .g.dart extension
// at last of the same File name you are using
// and add "part" keyword before all.

@HiveType(typeId: 0) //Add this Line
class WeatherModel {
  @HiveField(0) //Add this Line,From Index 0... and so on.
  String user_city; // Your Class Materials...
  @HiveField(1) //Add this Line,From Index 0... and so on.
  bool celciusMetric;

  

  WeatherModel(
      {this.user_city,this.celciusMetric}); //Constructor here.. 

  // flutter packages pub run build_runner build
}

在您阅读完上面的全部注释代码后， 并根据您的用途实施。 转到您的终端并在那里写下，flutter packages pub run build_runner build --delete-conflicting-outputs 就可以了，您会发现

现在转到您的 main.dart 并导入 hive 的所有内容。