Got it kind of working, for some reason the interval type in my postgres instance does not correspond to the parser from kqr but i managed to implement a version that kind of works. More importantly the experience has been great for understanding how to do my own conversion types. Thanks for the help.

On Saturday, January 3, 2015 9:53:31 PM UTC+11, Tom Ellis wrote:

On Tue, Dec 30, 2014 at 04:59:29PM -0800, in...@rotnetix.com wrote:
> That might be tricky...
> See https://github.com/lpsmith/postgresql-simple/pull/115, it seems like
> it is not trivial to get the conversions to haskell types correct.
>
> Look like I am back to native SQL for that one.

As lpsmith says here

https://github.com/lpsmith/postgresql-simple/pull/115#issuecomment-48754627

you can use the attached patch in your own code to get a conversion from
`interval` to `DiffTime`. It will have a few strange corner cases but you
will probably find you never hit them.

Once you've done that you can make them suitable for Opaleye by writing

data PGInterval

instance QueryRunnerColumnDefault PGInterval DiffTime where
queryRunnerColumnDefault = fieldQueryRunnerColumn

(you may have to import something from Opaleye.Internal.RunQuery).

Please let me know how you get on with that, if you try it.

Tom
_______________________________________________
Haskell-Cafe mailing list
Haskel...@haskell.org
http://www.haskell.org/mailman/listinfo/haskell-cafe