#鸿蒙学习大百科#如何创建一个分布式数据对象？

"module": {
    ...
    "requestPermissions": [
        {
            "name": "ohos.permission.DISTRIBUTED_DATASYNC"
        }
    ]
}

import ohos.aafwk.ability.Ability;
import ohos.aafwk.content.Intent;
import ohos.data.distributed.common.KvManager;
import ohos.data.distributed.common.KvManagerConfig;
import ohos.data.distributed.common.KvManagerFactory;
import ohos.data.distributed.common.KvStore;
import ohos.data.distributed.user.Options;
import ohos.data.distributed.common.KvStoreException;

public class MyFeatureAbility extends Ability {

    private KvManager kvManager;
    private KvStore kvStore;

    @Override
    public void onStart(Intent intent) {
        super.onStart(intent);

        // 创建 KvManagerConfig
        KvManagerConfig config = new KvManagerConfig(this);

        // 获取 KvManager 实例
        kvManager = KvManagerFactory.getInstance().createKvManager(config);

        // 设置分布式存储选项
        Options options = new Options();
        options.setCreateIfMissing(true)
               .setEncrypt(false) // 是否加密
               .setSyncable(true); // 设置为可同步
        
        try {
            // 获取或创建分布式数据库
            kvStore = kvManager.getKvStore("distributed_store", options);
        } catch (KvStoreException e) {
            e.printStackTrace();
        }
    }
}

// 向分布式存储写入数据
kvStore.putString("example_key", "example_value");

// 从分布式存储读取数据
String value = kvStore.getString("example_key", "default_value");

// 设置同步回调
kvStore.setSyncCallback(new SyncCallback() {
    @Override
    public void onComplete(SyncResult syncResult) {
        if (syncResult.getStatusCode() == SyncStatusCode.OK) {
            // 同步成功
        }
    }
});

// 执行同步操作
kvStore.sync(null, SyncMode.PUSH_PULL);

kvStore.subscribe(new KvSubscribeType[]{KvSubscribeType.SUBSCRIBE_TYPE_LOCAL}, new KvDataObserver() {
    @Override
    public void onChange(ChangeNotification notification) {
        // 处理数据变化
        Map<String, Entry> changedEntries = notification.getInsertEntries();
        // 具体处理逻辑
    }
});

// 导入模块
import distributedDataObject from '@ohos.data.distributedDataObject';

class People {
  name: string = ''
  age: number = 0

  constructor(name: string, age: number) {
    this.name = name
    this.age = age
  }
}
@Entry
@Component
struct Index {
  build() {
    Column() {
      Button("创建分布式对象").onClick(() => {
        let people = new People("张三",30)
        let localObject: distributedDataObject.DataObject = distributedDataObject.create(getContext(this), people);
      })
    }
    .width('100%')
    .height('100%')
    .justifyContent(FlexAlign.Center)
  }
}