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Re: Framework EOModel Question
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Re: Framework EOModel Question


  • Subject: Re: Framework EOModel Question
  • From: Chuck Hill <email@hidden>
  • Date: Wed, 3 Aug 2005 21:44:02 -0700


On Aug 3, 2005, at 9:20 PM, LD wrote:

Hi there,

On 03/07/2004, at 6:11 AM, Hunter Hillegas wrote:

On Jul 2, 2004, at 1:01 PM, Chuck Hill wrote:

On Jul 2, 2004, at 12:52 PM, Hunter Hillegas wrote:

I have a question regarding EOModels in reusable frameworks...

So, if you plan to write a framework that contains EOs and you plan to re-use it in many applications... How do you usually manage the EOModel? Since the database will be different for each application... What is the best practice here?

Keep the DB connection information in a properties file at the app level. Update the models automatically on load. See code on www.wocode.com or in Project WONDER for this.

Right on. For anyone else looking, here is the URL:
http://wocode.com/cgi-bin/WebObjects/WOCode.woa/wa/ShareCodeItem? itemId=216

That's helpful... but how do you create a framework that will make sure a specific db plugin framework, for example, is utilised when included in a project (that should be agnostic about the underlying db)?


Simple, you don't. :-) The framework is db agnostic. The application (or classpath at least) can't be. Loading prototypes and the connection dictionary at runtime will allow your framework and application to run with multiple databases. But at runtime you either have to ensure the correct plugin is on the classpath or load them all. Which amounts to the same thing, I guess. Frameworks can't control the application's classapath beyond the jar files contained in the framework. You could, I suppose, embed the jar files for all possible plugins in your framework. Imagine how much fun keeping that system updated will be!


I've built a framework that has the EOModels and the EOEnterpriseObjects for these. I'm currently using a PostgreSQLPlugin.framework but aren't sure about how make sure this framework is referenced when my model framework is included in a project. Any ideas?


The app doesn't need to reference that framework specifically, just the plugin for the database in use.



Chuck


--
Practical WebObjects - a book for intermediate WebObjects developers who want to increase their overall knowledge of WebObjects, or those who are trying to solve specific application development problems.
http://www.global-village.net/products/practical_webobjects




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