#鸿蒙通关秘籍#如何在鸿蒙设备间订阅数据库数据变化?-鸿蒙开发者社区-51CTO.COM

#鸿蒙通关秘籍#如何在鸿蒙设备间订阅数据库数据变化?

HarmonyOS
2024-12-09 15:03:19
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星H恋DNS

在鸿蒙设备间订阅数据库变化可以通过以下过程:

  1. 调用订阅接口以来观察数据库的变化: bash let devices = undefined; try { if(store != undefined) { store.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}'); }

  2. 当不再需要订阅时可取消: bash try { if(store != undefined) { store.off('dataChange', relationalStore.SubscribeType.SUBSCRIBE_TYPE_REMOTE, (storeObserver) => { }); } } catch (err) { console.error('Failed to cancel observer. Code:${err.code},message:${err.message}'); }

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2024-12-09 16:36:10
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