Re: something like an Index?

Thank you both for your answers. Indeed I have started planing my application 
with Trees given by the Java API. However, I did not take TreeMap, but 
TreeSet, because there must not be any duplicates.
I am starting to understand how to use Ozone and I like it. It is what I was 
looking for. :)

On Tue, 2006-04-25 at 12:13, Jimmy Stiefel wrote:
> You build your own indexes in Ozone any way you want.
>
> In your example, I'd recommend something along the lines of a TreeMap
> inside an Ozone object so it is persistent.  Make Person extend
> OzoneRemote so it is a first class persistent object.  Define Index that
> extends OzoneObject, and wraps a TreeMap in its impl.  Create two Index
> in the database & name them,  one to map id -> Person "id_index", one to
> map name -> Person "name_index".  Write a little code to keep them
> consistent and that's it.  Use TreeMap methods like submap for qeuries,
> throw in some regular expressions for more powerful searching.
>
> Whatever query methods you need,  make sure to write them as methods on
> your Index so the collection traversals and contained object method
> invocations all happen inside the server context so they are local calls
> and therefore fast.
>
> ~Jimmy

On Mon, 2006-04-17 at 14:28, Nicolas Barrera wrote:
> As far as i 'm concerned..,
> 
> ozone developers 're opposed to the idea of having some kind of query
> language that would for example aid you to ask for 'all persons whose
> name starts with "Q" and whose id is lower than 5 (etc, etc,)....' in
> just one sentence
> 
> If you re working with ozone you 'll ask the db for an object which
> contain references to your persons collection and then you 'd iterate
> and filter that collection in a really Object-Oriented-Programming
> way.
> 
> Off-topic: i totally agree with these guys in that the OOP way is the
> nicer and better-looking (and even the correct one), but i 'm not sure
> if performance is a drawback for this focus or not.
> 
> greetings, hope i ve give you some hint..,
> 
> lastly, if you 're looking for indexes in ozone.... well i belive that
> ozone users don't care about indexes, they care about OBJECTS, so as i
> said earlier, you pick up your collection and iterate it.
> 
> c ya!

> On Sat, 2006-04-15 at 16:08 +0200, Martin Walch wrote:
> > Hello,
> >
> > I'm new to ozone and also rather new to databases in general.
> > For my current project some kind of OODBMS seems to be a good choice.
> > However, beside some rather complex structures, I've got also long lists
> > of Objects of the same class.
> > Concretely: I have got a list of persons with names, addresses, ids and
> > so on. I need to find somebody in this list either by name or by id. Both
> > options must work fast. So in a RDBMS like e. g. MySQL I would probably
> > create an index for names and one for ids. Well, this is no RDBMS.
> >
> > How can I implement this in Ozone?


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