Design question - when to generalize/specialize? or Issues with a legacy da

We are designing the object model for a new system. But we have a legacy data model which stores both orders and order items in the same table. The relationship (between order and order items) is maintained through a self foreign key to the same table (recursion). We are discussing possible alternatives to this model.
The developers of the old system say that the problem with storing both orders and order items is the complexity of the SQL code (with self-joins) and maintenance over time.
To the legacy model's defense, order and order items do have some common attributes and similar life-cycles (like an order item could be tracked in its separate workflow [as an order would be tracked]).
I agree it would be cleaner to separate the order item into its own table. But I would like to find about general perspective, suggestions on this issue. Which is better? What are the issues to be considered from the perspective of designing the object model? From the performance perspective? From the object/relational mapping perspective?
Note: The database is Oracle and the new solution will be Java/J2EE based.
Thanks.

Can order-items contain sub-order items ?
Is it like a tree, in which Order is at the root level and the tree can
have any depth ?
If order-items can contain sub-order items recursively, you will have to
do the self-join SQL anyway ?
There must be some data that is common to all items of an order, such
as shipping date.
I also feel that you will benefit from moving the order item to separate table.
Maybe you can create the new tables and run the SQL and see if there is really
any performance issue.

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This usually involves 2 hard drives and an audio interface.
The audio interface has a FW 400 input. The hard drives have 800 and 400, among other options.
Since I can always successfully run any 2 devices without issues, I have to eliminate the drives, cables, or the new audio interface as a problem (??)
I'm not aware of any storm or electrical surge to have done damage. Anything is possible, of course.
For my day-2-day work, I need both drives and the audio interface up and running.
Data always seems fine.
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Several months ago I purchased a WRT160N v2. I was connecting four devices. 1 XP machine, 1 Vista machine, 1 PS3, and 1 Xbox 360.
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The process was fairly straight forward and I was successful in getting everything set up correctly. It worked great for the most part barring any unexpected wireless crashes.
A few weeks ago I accidentally bricked the router when trying to upgrade the firmware. It was my mistake and I should have been thinking but it happened. I was able to get a replacement from Linksys and I received the WRT160N v3
Sadly this router hasn't provided me with the same easy of installation.
Right now the situation is a little different than before. I am running a Windows 7 machine right now. It's up to date and working great. I haven't noticed any issues with the OS other than some random driver issues here and there.
I first attempted to just plug the router into my modem to see if my Windows 7 machine would automatically see it and connect. To my surprise it actually did. It connected and I was able to get online.
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The final thing I did was plug my computer directly to the router without connection to the internet and disconnected from the Wireless and attempted to upgrade the firmware. THIS PROCESS WAS SUCCESSFUL. It did not fail and brick the router. I did it correctly this time. To repeat, this did not brick the router.
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Does the WRT160N v3 have issues with Windows 7?
Why exactly am I have so many issues with it at all?
Are there issues with my wireless card and Windows 7?
Would the compatibility issues cause the LAN connections to fail between the router and my Windows 7 machine?
Is there a better router solution for me?
I would prefer to not have to revert back to Windows XP as I am enjoying Windows 7.
I would appreciate any help I can get as I'm fairly unhappy with these two products so far.
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Message Edited by Carrot on 07-14-2009 04:34 PM

New issue with 3G network

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You isolated it right away
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http://www.wireless.att.com/coverageviewer/
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Design question about when to use inner classes for models

This is a general design question about when to use inner classes or separate classes when dealing with table models and such. Typically I'd want to have everything related to a table within one classes, but looking at some tutorials that teach how to add a button to a table I'm finding that you have to implement quite a sophisticated tablemodel which, if nothing else, is somewhat unweildy to put as an inner class.
The tutorial I'm following in particular is this one:
http://www.devx.com/getHelpOn/10MinuteSolution/20425
I was just wondering if somebody can give me their personal opinion as to when they would place that abstracttablemodel into a separate class and when they would just have it as an inner class. I guess re-usability is one consideration, but just wanted to get some good design suggestions.

It's funny that you mention that because I was comparing how the example I linked to above creates a usable button in the table and how you implemented it in another thread where you used a ButtonColumn object. I was trying to compare both implementations, but being a newbie at this, they seemed entirely different from each other. The way I understand it with the example above is that it creates a TableRenderer which should be able to render any component object, then it sets the defaultRenderer to the default and JButton.Class' renderer to that custom renderer. I don't totally understand your design in the thread
http://forum.java.sun.com/thread.jspa?forumID=57&threadID=680674
quite yet, but it's implemented in quite a bit different way. Like I was saying the buttonClass that you created seem to be creating an object of which function I don't quite see. It looks more like a method, but I'm still trying to see how you did it, since it obviously worked.
Man adding a button to a table is much more difficult than I imagined.
Message was edited by:
deadseasquirrels

Infoset - Performance and Design Question .

Hello BW Gurus,
I have a question regarding the infoset.
We have a backlog report designed as follows:
sd_c03 - with around 125 chracteristics and kf's - daily load will have around 10 K records at a time.
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My question:
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Please advise. We are in the development and the objects are not yet moved to production yet.Again thanks for your help in advance.
Senthil

Hi......
1.We have infoset ontop of this 2 cubes for reporting. Can we use infoset for reporting .I used infoset for master data and DSO reporting. Do you guys see any performance issue with using the infoset instead of multiprovider. Is there any alternative instead of reporting from infoset
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Check this .........
https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/2f5aa43f-0c01-0010-a990-9641d3d4eef7
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