3 May
2008
3 May
'08
11:06 a.m.
Hi all,
I am afraid the title of this thread is a bit pompous :-)
In fact the question seems to me to be an entry level object oriented
database design, but I am not able to make my mind about this. Your help
will be greatly appreciated!
Here a simple chart about the problem:
http://mire.environmentalchange.net/~webmaster/pdr/dataModelpdR.png
I have two ever-growing pools of data: providers and fishes. By
following the ToDo and FAQ tutorials, I "easily" could create and
instantiate the two classes but, how could I establish the relationship
between providers and fishes?
Thanks!
Ricardo
--
Ricardo Rodríguez
Your EPEC Network ICT Team
4 May
4 May
1:27 p.m.
Hi,
I think one way is this. As a connector for this classes use xwiki
document. I mean you have two xwiki classes. One is FishProvider and other
one is Fishes or for each fish species one class. You connect both of them
by adding them to some xwiki document. So you will get unique connection for
FishProvider and Fishes.
For example you have class Fish1 and class FishProvider.
Fish1 will have propertie like size.
FishProvider will have propertie like name.
Now you create xwiki document, for example with name Fishery, and as next
step you create object for class Fish1 and another object for class
FishProvider. These two objects is now attached to xwiki document Fishery.
In database it connected throught table XWikiObjects.
I hope that, it will help you.
Jan
On Sat, May 3, 2008 at 11:06 AM, [Ricardo Rodriguez] Your EPEC Network ICT
Team <webmaster(a)environmentalchange.net> wrote:
Hi all,
I am afraid the title of this thread is a bit pompous :-)
In fact the question seems to me to be an entry level object oriented
database design, but I am not able to make my mind about this. Your help
will be greatly appreciated!
Here a simple chart about the problem:
http://mire.environmentalchange.net/~webmaster/pdr/dataModelpdR.png<http…
I have two ever-growing pools of data: providers and fishes. By
following the ToDo and FAQ tutorials, I "easily" could create and
instantiate the two classes but, how could I establish the relationship
between providers and fishes?
Thanks!
Ricardo
--
Ricardo Rodríguez
Your EPEC Network ICT Team
_______________________________________________
users mailing list
users(a)xwiki.org
http://lists.xwiki.org/mailman/listinfo/users
11:52 p.m.
Thanks Jan,
Jan Kodera wrote:
Hi,
I think one way is this. As a connector for this classes use xwiki
document. I mean you have two xwiki classes. One is FishProvider and other
one is Fishes or for each fish species one class. You connect both of them
by adding them to some xwiki document. So you will get unique connection for
FishProvider and Fishes.
For example you have class Fish1 and class FishProvider.
Fish1 will have propertie like size.
FishProvider will have propertie like name.
Now you create xwiki document, for example with name Fishery, and as next
step you create object for class Fish1 and another object for class
FishProvider. These two objects is now attached to xwiki document Fishery.
In database it connected throught table XWikiObjects.
I hope that, it will help you.
Jan
Yes, the document is a nice metaphor where we can instantiate both
freshFishProviderClass and speciesClass. But consider this: species 1, 2
and 3 have all three the same properties (at least some properties)
whatever provider supplies them. If I have to instantiate the
speciesClass once for each provider providing each species, I am forced
to repeat the same information for each object.
The point is, when I have a speciesClass instance for a given species,
let's say /Raja batis/, how could I "link" it to all and each providers
providing it? This is clear to me in a relational schema, but not so
clear in a object-oriented one; well, much better: not clear at all! :-)
Thanks for your reply!
Ricardo
--
Ricardo Rodríguez
Your EPEC Network ICT Team
6032
days inactive
6033
days old
2 comments
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[Ricardo Rodriguez] Your EPEC Network ICT Team -
Jan Kodera