Do any of the Scala ORM's implement code generation from SQL -> Scala?

Question

I am using Squeryl as an ORM with MySQL. This is a new project working with existing schemas that contain several hundred tables.

As far as I can tell, neither Squeryl nor any of the available Scala ORMs can generate the O (Scala classes) from the R (mysql tables). I suppose it wouldn't be too hard to roll my own by crawling the information schema, but I'd rather not duplicate that effort if someone else has already done so.

I'm also curious if anyone can tell me why the R->O direction is so often neglected. In my experience, O->R is the exception and not the rule.

I'll probably start down the path of rolling my own solution. If that's anywhere near complete before I hear of another option, I'll post a link to that code.

Thanks.

Answer 1

QueryDSL provides you with a utility, that can generate code from existing tables. You would however need to accept, that it's primarily a Java lib, and Scala is treated only as an extension there.

I guess the support for R-O is just a matter of time and users' feedback.

Answer 2

There is Squealer which does query database tables and generate scala code. It uses Squeryl and other libraries.
I managed to use it with minimal tweaking.

Its gitub is here

Answer 3

I'm curious what type of projects you are working on where you've found R->O to be the rule. My experience, and I'm including not just my own projects but those that other Squeryl users have mentioned on the mailing list, is that most Squeryl projects are predominantly new applications where an SQL database is being used to persist an application specific model rather than a model being created to match an existing schema. Like most OS projects the developers tend to focus first on features that they themselves need and second on features that are most requested by the community so I would encourage you to take this up at the Squeryl Google Group as well.