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svg at disney.surnet.ru
Posted: Mon Sep 13, 1999 8:07 pm Reply with quote
Guest
Then I was trying to execute a mnesia query, based on two tables,
such as from eva/examples/simple_adaptation.erl :

Handle = query [{A.name, A.sender, A.cause, A.severity, AlarmDef.class} ||
A <- table(alarm),
AlarmDef <- table(alarmTable),
A.name = AlarmDef.name] end,
{atomic, Alarms} = mnesia:transaction(fun() -> mnemosyne:eval(Handle) end),
...

I had always got error, such as :
{'EXIT',{badarg,{ets,lookup,[db_get,[mnemosyne_catalog,{image,alarm}]]}}} ?

Query, based on one table, executed well.

My environment are RedHat Linux6.0 and Erlang47.4.1 installed from rpm distribution.

Regards.
---
Vladimir Sekissov svg_at_ptt.chel.su


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dgud at erix.ericsson.se
Posted: Tue Sep 14, 1999 5:53 am Reply with quote
Guest
Try starting mnemosyne first.
application:start(mnemosyne).

The reason is that simple queries don't need the application
to be started, while more complex, in this case 2 tables,
queries requires mnemosyne.

/Dan


svg_at_disney.surnet.ru writes:
>
> Then I was trying to execute a mnesia query, based on two tables,
> such as from eva/examples/simple_adaptation.erl :
>
> Handle = query [{A.name, A.sender, A.cause, A.severity, AlarmDef.class} ||
> A <- table(alarm),
> AlarmDef <- table(alarmTable),
> A.name = AlarmDef.name] end,
> {atomic, Alarms} = mnesia:transaction(fun() -> mnemosyne:eval(Handle) end),
> ...
>
> I had always got error, such as :
> {'EXIT',{badarg,{ets,lookup,[db_get,[mnemosyne_catalog,{image,alarm}]]}}} ?
>
> Query, based on one table, executed well.
>
> My environment are RedHat Linux6.0 and Erlang47.4.1 installed from rpm distribution.
>
> Regards.
> ---
> Vladimir Sekissov svg_at_ptt.chel.su


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