Re: OOP/OOD Philosophy

Phlip wrote: 
frebe wrote:


Just keep to ANSI SQL and you will be able to change database vendor at
any time. The applications I currently work with, are database vendor
independent without separating the database schema from the GUI or
"business" logic. Using ANSI SQL the database schema are already
separated from the database vendor.



I want to switch to XML.


"I'm sorry, but we didn't plan for XML. So, you can't without, essentially, a rewrite."

"Well, can't you change the code quickly to accomodate XML? I read about a team that converted persistence strategies in a 100 KSLOC code base in about a week. They said that all of the tests that they had helped them do it."

"Er, I'm sorry about that too, but you see once we figured out that had to populate a database every time that we wanted to setup a test, well, we stopped writing as many tests. Plus, the only way to test our app is through the GUI with a screen-scraping tool and well, the tests are horrible to maintain. We have some tests but nowhere near as many as it would take to do a quick safe conversion."

"Please tell me I didn't pay for this."


Michael Feathers
author, Working Effectively with Legacy Code (Prentice Hall)
www.objectmentor.com
.

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