In the Readme,  you mention the type issue is less relevant to sqlite-simple than the others.

Now,  I've not actually used SQLite myself, but I have done some reading about it.   I do understand that values of any type can be stored at any time in any column (except for the primary key,  IIRC),   but what happens to the declared type of a column when you create a table?   Is that completely ignored?   Can it be retrieved?   Is it also returned somehow with the results?

I mean, it may still be a good idea to be able to check that somehow.   Though this does add the complication that you still want to be able to use sqlite-simple with existing databases that don't necessarily follow the typing rules.

Best,
Leon



On Sat, Aug 11, 2012 at 2:39 PM, Janne Hellsten <jjhellst@gmail.com> wrote:
Hi again!

I finally found some time to work on the below idea of creating a
sqlite-simple package that's modeled after postgresql-simple &
mysql-simple.

A working prototype can be found here: https://github.com/nurpax/sqlite-simple

I still need to do a bit of work on it to clean things up and add a
bit more functionality.  In particular, FromField instances are
currently limited to only Ints and Strings - this is obviously not
adequate for real use.

I consider this to be ready for first release on hackage once I've
done some more testing and closed the issues on
https://github.com/nurpax/sqlite-simple/issues?milestone=1&state=open
- but of course I may have missed something obvious.

Comments, concerns?  Let me know!

Cheers,

Janne

On Wed, Aug 1, 2012 at 9:41 PM, Janne Hellsten <jjhellst@gmail.com> wrote:
> Hi list,
>
> I've been looking for better Haskell sqlite bindings for few months now.
>
> So far I've tried or investigated the following sqlite packages:
>
> - hdbc-sqlite3
> - sqlite
> - direct-sqlite
>
> At the same time I've played around a bit with postgresql-simple.
> I've come to quite like the postgresql-simple API and would like to
> have a access API for sqlite.
>
> Unfortunately, all the existing sqlite bindings seem to offer a much
> lower level interface.
>
> I'm thinking that if no *-simple style Haskell library exists for
> sqlite3, I'd like to create one.
>
> I've exchanged a few e-mails about this with Leon and with his help
> have a few ideas on how to go about it.
>
> Leon suggested that the design should be two libraries: one low-level
> library that can be unsafe to use directly and another medium-level
> package that's built on the low-level library.  The medium part would
> borrow pretty directly from existing *-simple packages.
>
> I dabbled a bit with my own low-level sqlite bindings but later came
> to realize that the direct-sqlite package
> (http://ireneknapp.com/software/) seems to be pretty close to what I'd
> need.  So I'm thinking that could be the low-level part of
> sqlite-simple.
>
> Does this seem like a useful thing to build? (I know I'd need it.)
>
> Does something like this already exist?
>
> Thanks!
>
> Janne

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