#鸿蒙学习大百科#关系型数据库如何开启订阅分布式数据变化？

let devices: string | undefined = undefined;
try {
  // 调用分布式数据订阅接口，注册数据库的观察者
  // 当分布式数据库中的数据发生更改时，将调用回调
  if(store != undefined) {
    (store as relationalStore.RdbStore).on('dataChange', relationalStore.SubscribeType.SUBSCRIBE_TYPE_REMOTE, (storeObserver)=>{
      if(devices != undefined){
        for (let i = 0; i < devices.length; i++) {
          console.info(`The data of device:${devices[i]} has been changed.`);
        }
      }
    });
  }
} catch (err) {
  console.error('Failed to register observer. Code:${err.code},message:${err.message}');
}