如何使用房间数据库作为缓存

Question

I am making an android app using MVVM architecture. I want to fetch data from an API and insert it into room database and then fetch it from the room in my app. I don't know if it is a better way to implement database cache functionality. If there is some other or better way to do so please let me know.

Answer 1

your question explains exactly how you would use Room:

1. fetch data from an api
2. insert it into room database
3. fetch it from room in my app

Room allows you to store your data locally and retrieve this data with various different threads, making use of something like Rxjava, it also allows you to observe onto any changes with LiveData, Room is definitely a decent option to consider for caching

BUT

Using Room is ONE of SEVERAL different implementations of caching, consider posting code or a specific scenario for better answers. Happy coding.

Edit:

A common approach to using Room (or any caching) would be to either load initial data from the database, display this to the user, perform an api call, update the cache and display this updated data from the api

OR

If the user does not have an internet connection, simply use what he has available in the cache as data. Again, all of this depends on your specific scenario.

Answer 2

Use database for the cache is not cheap, better use shared preferences for caching your data.

You can implement a class for cache data or use a library full feature for cache like kesho