1# Rdb_DataObserver 2 3## Overview 4 5Defines a struct for the data observer. 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| void* context | Pointer to the context of the data observer.| 20| [Rdb_SubscribeCallback](capi-rdb-rdb-subscribecallback.md) callback | Callback used to return the result. | 21