iOS: how to cache sqlite queries

I'm developing an iOS application which makes a massive use of a locally stored sqlite database. Since the database is rarely updated, I would like to cache the results of queries (some of them may be costly) in order to improve performance. I've been using FMDB for a long time, but it doesn't seem include caching in its features.

Is there an alternative library supporting sqlite caching out there? How would you implement sqlite caching to your project?

Thanks