Re: The wisdom of the object mentors (Was: Searching OO Associations with RDBMS Persistence Models)
Date: Wed, 31 May 2006 08:46:27 -0500
Message-ID: <2006053108462738165-unclebob_at_objectmentorcom>
On 2006-05-30 07:33:03 -0500, "Tony Andrews" <andrewst_at_onetel.com> said:
> Alfredo Novoa wrote:
>> Robert Martin wrote:
>>> No, a DBMS is a bucket of bits with some low level rules to manage
>>> those bits. An OO application provides the beavior that the customer
>>> wants to see. We can completely eliminate the DBMS and replace it with
>>> another of an entirely different form (non Relational for example) and
>>> still have all the business behavior we need.
>>
>>> The people who sell databases have sold you, and the industry, a
>>> misconception: that the database is the heart of the system. This is
>>> flawed. The heart of the system is the application code. The database
>>> is a detail to be decided at the last possible moment and kept in a
>>> position so flexible that it can be swapped out for another at a whim.
>> >> If the mentors are like this, I don't want to imagine the rest. > > Considering the use of so many button-pushingly ludicrous statements > such as "a DBMS is a bucket of bits" and "swapped out for another at a > whim", do you not think perhaps Mr Martin was teasing (or goading) you?
I was doing neither. I was expounding an attitude about DBMSs that I have found useful over the years. When I put a system together I treat the DBMS as a detail. I isolate it from the application code as much as possible. What results is an application design which is deeply partitioned into areas that know a lot about the DB and areas that know nothing about the DB. This is just good decoupling.
-- Robert C. Martin (Uncle Bob) | email: unclebob_at_objectmentor.com Object Mentor Inc. | blog: www.butunclebob.com The Agile Transition Experts | web: www.objectmentor.com 800-338-6716 |Received on Wed May 31 2006 - 15:46:27 CEST