How to use SQLite in Kotlin/Native?

Question

For a multi-platform project, I consider Kotlin/Native , with the hope to have a common code base at least for business logic and saving of data.

For saving of data I would like to use a database like SQLite. However, according to another stackoverflow thread , if I want to compile to Kotlin/Native, I cannot use any Java file. If I understand this correctly, it also means that any SQLite library I include is not allowed to import from Java.

On the search for such a library, I found two interesting database projects by Jetbrain, namely Anko SQLite and Exposed . However, when digging in their source code, at the time of this writing both import from Java (eg java.sql). Which probably means I cannot use them.

One idea I had was to use a c-based sqlite library, since according to mentioned thread , Kotlin/Native code is allowed to use c libraries. This may be possible, but I wondered if there isn't a suggested more Kotlin like way of using SQLite or another database in Kotlin/Native?

Answer 1

You do need to use the C SQLite library, but most of your code shouldn't work with it directly. Instead you write a wrapper which will be the more Kotlin-like way you are asking about.

I haven't seen such a wrapper done as a separate maintained project (there are very few libraries for Kotlin/Native yet), but Jetbrains actually has a basic one in https://github.com/JetBrains/kotlinconf-spinner/tree/master/kotlin-native/samples/fullstack/sql which you can use as base for your own.