[erlang-questions] Mnesia docs question

Kirill Zaborski <>
Thu Jun 14 10:52:16 CEST 2007


Oops, that was my fault, sorry :)

Regards,
Kirill.

On 6/14/07, Christian S <> wrote:
It is mnesia:transaction/1,2,3 that adds the {atomic, X}, where X is
> the return value of your Fun passed to mnesia:transaction. It allows
> you to check that the transaction succeeded.
>
> Your badmatch could be that you are running this from the shell and X
> is already bound?
>
>
> On 6/14/07, Kirill Zaborski <> wrote:
> > Reading docs for mnesia I see
> >   read({Tab, Key}) -> transaction abort | RecordList
> >
> > And in User docs I see an example:
> >   [E] = mnesia:read(employee, Eno, write)
> >
> > But when I run (x is some existing example table):
> >   mnesia:transaction( fun()-> [X] = mnesia:read({x, 1}) end).
> >
> > I get
> >   {aborted,{{badmatch,[#x{a = 1,b = 1}]},[{erl_eval,expr,3}]}}
> >
> > It looks like read/2 returns {atomic, RecordList} and not just RecordList.
> > Was their some such change in mnesia API and there is a bug in
> > documentation and I should post it to erlang-bugs?
> >
> > Regards,
> > Kirill.
> > _______________________________________________
> > erlang-questions mailing list
> > 
> > http://www.erlang.org/mailman/listinfo/erlang-questions
> >
>



More information about the erlang-questions mailing list