[erlang-questions] Re: Mnesia Read/Write question.

[G.S.]

Hello,

Maria, I'm not having problems with the B) version, only with A). (The error
you noted was due to my misspelling it in the email).

Could syntax in "A)" be deprecated? I got it from Mnesia A Distributed
Robust DBMS for Telecommunications Applications, which I think was published
in 98 or earlier.

Regards,
-Gene

On Thu, Jul 30, 2009 at 11:04 PM, Steve Davis <
steven.charles.davis@REDACTED> wrote:

> Hello Gene,
>
> It looks like #test.id is the key, not #test.item. In the first
> example, I suspect id is undefined. In the second it is. To find by
> item, which appears to be what you are trying to do in (A), you would
> have to use matches.
>
> /sd
>
> On Jul 30, 11:19 pm, "G.S." <corticalcompu...@REDACTED> wrote:
> > Hello everyone,
> > This is probably a very stupid question/problem, but I'm having trouble
> > using the following commands:
> >
> > A) mnesia:dirty_write(Id#test{item = hello}) and
> > mnesia:dirty_read(Id#test.item)  I get: exception error: {badrecord,test}
> > but this works on the same table/schema...:
> > B) Thing = #test{id = 1, item = hello}, mnesia:dirty_write(test,Thing),
> > mnesia:dirty_read(test,Id).
> >
> > Are "A)" valid commands, what am I doing wrong?
> >
> > Regards,
> > -Gene
>
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