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armink avatar armink commented on July 26, 2024

FlashDB 本身是支持回滚的，即使是启用 FILE_MODE ，功能上同样也是支持的

就是底层文件系统选型时，是需要有掉电保护功能的支持，比如：littlefs 。如果掉电后，文件系统崩了，那 FlashDB 也无能为力了

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jjldc avatar jjldc commented on July 26, 2024

FlashDB的回滚是基于单个kv的status状态做的回滚吧？
API中只有fdb_kv_set单个kv的接口，没有set一组kv的接口。当连续设置一组kv时，也许要求1/2/3/4四个参数必须同时写入。当依次调用fdb_kv_set修改值期间出现断电等故障，可能出现1/2是新数据，3/4是旧数据的情况吧
我刚开始看代码，可能理解还不深，说错了请包涵。

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armink avatar armink commented on July 26, 2024

是的，现在只有单个 KV 的操作接口，毕竟是嵌入式设备相比还是功能简单了一些

单个 KV 出错后，回滚是支持的

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