[erlang-questions] How to return all records in dets

[Garrett Smith]

Llyoid, I misspoke. It's spelled fubar:

http://www.urbandictionary.com/define.php?term=fubar

On Fri, May 30, 2014 at 3:56 PM, Garrett Smith <g@REDACTED> wrote:
> Llyod, your first error -- the call to tab2list -- is foobaring the
> dets file reference. The dets process is linked to the shell process
> on open_file, so when the shell process crashes as a result of this
> call to tab2list, every call after that will raise bad argument.
>
> The trick here is to *never* make a mistake in the shell :)
>
> (Just re-open the table and the subsequent calls will work)
>
> On Fri, May 30, 2014 at 3:46 PM,  <lloyd@REDACTED> wrote:
>> Hi Ulf,
>>
>> No cigar.
>>
>> First I tried in Erlang shell:
>>
>> (nitrogen@REDACTED)36> visitor_store:open_visitor_db().
>> dets opened: visitors
>> void
>> (nitrogen@REDACTED)37> dets:tab2list(visitors).
>> ** exception error: undefined function dets:tab2list/1
>>
>> (I'm running R17.0; noticed that tab2list/1 is not in docs. We do have to_ets/1, but I haven't tried that yet.)
>>
>>
>> (nitrogen@REDACTED)38> dets:select(visitors, [{'_',[], ['$_']}]).
>> ** exception error: bad argument
>>      in function  dets:select/2
>>         called as dets:select(visitors,[{'_',[],['$_']}])
>>
>> (Maybe my typo, but I can't see it.)
>>
>> (nitrogen@REDACTED)39> dets:match_object(visitors, '_').
>> ** exception error: bad argument
>>      in function  dets:match_object/2
>>         called as dets:match_object(visitors,'_')
>>
>> So I created some functions:
>>
>> dump_visitors() ->
>>    dets:tab2list(visitors).
>>
>> dump_visitors1() ->
>>    dets:select(visitors, [{'_', [], ['$_']}]).
>>
>> dump_visitors2() ->
>>    dets:match_object(visitors, '_').
>>
>> And called them in the shell:
>>
>> (nitrogen@REDACTED)40> l(visitor_store).
>> {module,visitor_store}
>>
>> (nitrogen@REDACTED)41> visitor_store:dump_visitors().
>> ** exception error: undefined function dets:tab2list/1
>>
>> (nitrogen@REDACTED)42> visitor_store:dump_visitors1().
>> ** exception error: bad argument
>>      in function  dets:select/2
>>         called as dets:select(visitors,[{'_',[],['$_']}])
>>
>> (nitrogen@REDACTED)43> visitor_store:dump_visitors2().
>> ** exception error: bad argument
>>      in function  dets:match_object/2
>>         called as dets:match_object(visitors,'_')
>>
>> I feel like I'm jinxed.
>>
>> Thanks,
>>
>> Lloyd
>>
>>
>>
>>
>> -----Original Message-----
>> From: "Ulf Wiger" <ulf@REDACTED>
>> Sent: Friday, May 30, 2014 4:08pm
>> To: lloyd@REDACTED
>> Cc: "erlang questions" <erlang-questions@REDACTED>
>> Subject: Re: [erlang-questions] How to return all records in dets
>>
>>
>> ets:tab2list(Tab).
>>
>> ets:select(Tab, [{‘_’, [], [‘$_’]}]).
>>
>> ets:select(Tab, ets:fun2ms(fun(X) -> X end).
>>
>> ets:match_object(Tab, ‘_’)
>>
>> BR,
>> Ulf W
>>
>> On 30 May 2014, at 21:56, lloyd@REDACTED wrote:
>>
>>> Hello,
>>>
>>> I'm cross-eyed from looking at match specifications. All I want to do is list all records in my small dets table. I once ran across a very neat query to accomplish that, but for the life can't Google it up.
>>>
>>> Can some kind soul give me a query that works?
>>>
>>> Many thanks,
>>>
>>> LRP
>>>
>>>
>>>
>>> _______________________________________________
>>> erlang-questions mailing list
>>> erlang-questions@REDACTED
>>> http://erlang.org/mailman/listinfo/erlang-questions
>>
>> Ulf Wiger, Co-founder & Developer Advocate, Feuerlabs Inc.
>> http://feuerlabs.com
>>
>>
>>
>>
>>
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