"ocaml_beginners"::[] ocaml object persistence?

Is there a library available for ocaml which implements
object
persistence? I don't care strongly whether it's backed by
BDB, an RDBMS,
or the filesystem. Indeed, i don't mind if it stores
full-fledged
objects or just type instances.

I've searched through some of the documentation, the
libraries available
at the Hump, and the web, and i haven't found anything
available.

I'm willing to move forward implementing my own, but i
wanted to see
what was available in case i was reinventing the wheel.

Thanks,

-johnnnnnnnnn


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On Tue, 18 Jul 2006, johnnnnnn wrote:

> Is there a library available for ocaml which implements
object
> persistence? I don't care strongly whether it's
backed by BDB, an RDBMS,
> or the filesystem. Indeed, i don't mind if it stores
full-fledged
> objects or just type instances.
>
> I've searched through some of the documentation, the
libraries available
> at the Hump, and the web, and i haven't found anything
available.
>
> I'm willing to move forward implementing my own, but i
wanted to see
> what was available in case i was reinventing the wheel.

There is PERSIL http://cris
tal.inria.fr/~starynke/persil/
but I don't know much about it.

You can also roll your own using the Marshal module and your
favorite 
storage system.

Martin

--
Martin Jambon, PhD
http://martin.jambon.fre
e.fr


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On Tue, Jul 18, 2006 at 03:07:16PM -0500, johnnnnnn wrote:
> Is there a library available for ocaml which implements
object
> persistence? I don't care strongly whether it's
backed by BDB, an RDBMS,
> or the filesystem. Indeed, i don't mind if it stores
full-fledged
> objects or just type instances.

Marshal (part of the standard library) is probably the
easiest way to
go.  It has a big problem however which is that it isn't
type safe.
It will allow you to write, for example:

  let data = "this is my data" ;;
  let data : float = Marshal.from_string (Marshal.to_string
data []) 0 ;;

And that sort of thing can rapidly lead to segmentation
faults.

I was intrigued by Jonathan Roewen's pickle:

  htt
p://alan.petitepomme.net/cwn/2006.01.17.html#1

But I've not actually used it for anything yet.

How about using a database?  PG'OCaml is a type safe
interface to
PostgreSQL:

  http://merjis.co
m/developers/pgocaml

Rich.

-- 
Richard Jones, CTO Merjis Ltd.
Merjis - web marketing and technology - http://merjis.com
Team Notepad - intranets and extranets for business - http://team-notepad.com


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Martin Jambon wrote:
> There is PERSIL http://cris
tal.inria.fr/~starynke/persil/
> but I don't know much about it.

Interesting. Latest release in may of 2004... either very
stable or very
unmaintained. 


Richard Jones wrote:
> Marshal (part of the standard library) is probably the
easiest way to
> go.  It has a big problem however which is that it
isn't type safe.

Yeah. Type safety isn't a huge issue for me -- this is all
hobby code --
so i might end up just going that route. I had completely
missed it on
my run through the library.


> I was intrigued by Jonathan Roewen's pickle:
> 
>   htt
p://alan.petitepomme.net/cwn/2006.01.17.html#1

That looks promising, too.


> How about using a database?  PG'OCaml is a type safe
interface to
> PostgreSQL:

Thank you for suggesting Postgres instead of MySQL, but i'm
trying to
avoid a relational store for this particular project. It's
on relatively
limited hardware, and won't be doing anything aside from
single
primary-key retrieves, so i figured an object store would be
best.

Thanks everyone for the help.

-johnnnnn



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On Wed, Jul 19, 2006 at 01:15:37PM -0500, johnnnnnn wrote:
[...]

The other module you might want to look at is Dbm -- also
part of the
standard library.  It's an interface to NDBM databases.

There are plenty of other options too, eg. interfaces to
sqlite.

Rich.

-- 
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Merjis - web marketing and technology - http://merjis.com
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