Share database queries between different dialects

Description

I’m trying to develop a KMP project where server and client apps (jvm, Android, iOS and js) share the same database. The client must work offline so anything can be done locally or on the server. The client apps work using psqlite, the server postgresql.

Everything works fine if I use standard SQL in the queries. However the problems come where syntax differ. For example an upsert in sqlite would be:

REPLACE (...)
or a 
INSERT INTO (...) ON CONFLICT REPLACE

But in postgresql

INSERT INTO (...) ON CONFLICT (id) DO (...)

Is there a way or a plan to be able to work with this? Maybe it could be a way to specify the dialect of a query in the query definition (naming with the dialect like insert_sqlite: and insert_postgresql:)

Thanks!

[vanniktech]

I also would not share the schema between server and frontend to be honest. I share my database between frontend (ios & android) and on server it’s a separate thing. Usually, clients don’t need to know every column. Also clients have some kind of uploading queues which the server does not need.

[mateuy-dev]

@hfhbd thanks for the follow up.

At the end I’ve decided to divide sql files into common, psql and sqlite. I just use the common (most of the queries) for the generation of the two databases. Seeing that the common interfaces may disappear, I’ve created them manually and I delegate its methods to the current implementations. In this way I also join the common and non common queries in an interface. This is a bit of boilerplate, but I prefer it to the hack of reusing the interfaces.

If anyone wants to do this, here is my sample project