This is a good discussion!
I must admit I like Brian's Abstract Factory idea but does it have to be as
complex as Abstract Factory (you can tell they scare me a bit :-)
Would a simple Factory not do the job. ie the db can store in a table a version
number and the factory can give the Service the relevant DAO's / Gateways it
needs to work on the db?
ie you have a standard xxxxxDAO.cfc and a xxxxxDAOv2-1.cfc and the Factory
determines what to use.
You can do the same with your views if you need slightly different displays and
have a cfc handle the logic of what view to use.
Even this factory approach has a strict Java / C# OO feel about it. It can be
even simpler so the factory just gets the version from the db and does a <cfset
variables.xxxService.setxxxDAO(getBean("xxxDAOv#variables.qDbVersion.versionNumber#")
/> and the setter in the service has a type="any" ... ie no need for
interfaces or abstract dao class types
Something along those lines anyway!
Lovin' mxUnit by the way Marc :-)
Alan
________________________________________
From: [email protected] [EMAIL PROTECTED] On Behalf Of Tom Chiverton
[EMAIL PROTECTED]
Sent: 02 July 2008 16:48
To: [email protected]
Subject: [CFCDEV] Re: Advice on
On Wednesday 02 Jul 2008, Marc Esher wrote:
> That's true. It's mainly a matter of time and money. If we have 10
> systems, and there's a need to change (like my candy example), it
> generally is a need that arises from a single system but which will
> get pushed into all other systems eventually. It's just that it can
> take a bit of time to get the other systems in compliance.
So would simply versioning the DB schema against a version of the application
work then ?
Then as the other DBs get the same update done, you roll out the mathcing
application rev. ?
--
Tom Chiverton
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