1# Rdb_SubscribeCallback 2 3## Overview 4 5Defines a callback used to return the subscribed event. 6 7**Since**: 11 8 9**Related module**: [RDB](capi-rdb.md) 10 11**Header file**: [relational_store.h](capi-relational-store-h.md) 12 13## Summary 14 15### Member Variables 16 17| Name | Description | 18| ------------------------------------------------------------ | ---------------------------------- | 19| [Rdb_DetailsObserver](capi-relational-store-h.md#rdb_detailsobserver) detailsObserver | Callback used to return the details about the device-cloud data change.| 20| [Rdb_BriefObserver](capi-relational-store-h.md#rdb_briefobserver) briefObserver | Callback used to return the device-cloud data change event. | 21