[erlang-questions] How to use Mnesia Database from C/C++/Java ?

[Niclas Eklund]

Hello!

Yes, Mnesia Session is no longer supported (R12B). Since Mnesia Session
was based on dirty operations, you're better of defining an API that maps
to the data model. A step by step example you can find here:

http://www.erlang.org/doc/apps/orber/ch_idl_to_erlang_mapping.html#6

Or you can use Jinterface and/or Erl_interface, but CORBA makes it easy to
hook in another backend due to the number of available language bindings:

http://www.puder.org/corba/matrix/

As mentioned there are more alternatives (HTTP, SNMP etc), which is why
it's hard to tell which solution would be the best choice for you.

/Niclas

On Mon, 21 Jan 2008, Scott Lystig Fritchie wrote:

> Søren Hilmer <sh@REDACTED> wrote:
> 
> sh> There is/used to be, something called Mnesia Session for doing
> sh> exactly this.
> 
> I think it's been deprecated.
> 
> The bad news Amritpal will have to implement an interface from scrach.
> The good news is that it isn't difficult, and there are plenty of
> protocols to choose from.  Mnesia Session used CORBA, which I wouldn't
> recommend.  You could do also the same structured-data things as the old
> Mnesia Session CORBA via the Sun RPC library that's in Jungerl.
> 
> Using a simple/RESTful GET/POST/DELETE interface using HTTP is quite
> simple.  Using SOAP wouldn't be much harder, though why you'd want to
> get XML involved is an excellent question.  Also, I've seen least one
> "memcached" server implementation in Erlang (I forget the author's name
> but not the language: Japanese).
> 
> Even easier would be to have your C code use the Erlang term format (see
> http://www.erlang.org/doc/apps/erl_interface/part_erl_interface_frame.html).
> At my current employer, the whole Erlang "thing" was new enough that the
> client team didn't want to use an Erlang-specific wire format, in the
> event the Erlang experiment failed.  So we rolled our own little text,
> TCP-based protocol.  {shrug}  
> 
> I don't know if this list posting contains anything new, but if it's
> helpful, great.  http://www.nabble.com/Mnesia-td10106072.html
> 
> -Scott
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