[erlang-questions] ETS ordering

Ludovic Demblans <>
Sat Mar 1 00:00:52 CET 2014


Hi,

So I feel reassured, thank you.

I know (a bit) mnesia but I don't need much functionality and I may want
have a table per each sell point, I don't want to deal with different
record-name/table-name in mnesia at the moment. I can go to mnesia quickly
anyway because I use it already on the same project.

But I looked a bit and I've found messages on this list stating that the
best thing to do is to fetch all the matching records in a list and then
sorting it. In LYSE (mafiapp) Fred fetchs records into a dict and then
work on this dict.

So, what functionalities of mnesia could help dealing with ordering ? I've
found some ordering related stuff in the docs for the qlc module but as
you may have noticed, english read/write could be hard somehow.

Anyway ETS should be enough to implement a simple prototype.

Thanks again !

-- lud


Le Fri, 28 Feb 2014 18:03:22 +0100, Jesper Louis Andersen
<> a écrit:

> On Fri, Feb 28, 2014 at 5:55 PM, lud <> wrote:
>
>> {{ItemTypeID,Price,OrderID},Quantity,BuyerID}
>>
>
> This is a common trick which can often be used to satisfy these kinds of
> things. I use it quite often.
>
> However, given your situation, you may want to take the plunge and move  
> the
> whole thing to mnesia. It gives you a lot of added power which you can
> avoid reimplementing yourself. Even if you don't need that extra power  
> now,
> you need to figure out if it is necessary later.
>
>
>


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