NYCPHP Meetup

[nycphp-talk] ORM

Kenneth Downs ken at secdat.com
Sat Jan 27 09:28:07 EST 2007


I'm not usually one to complain about wikipedia, but I wouldn't put too 
much faith in that particular article, the author's knowledge of RDBMS 
is extremely weak. 

 Examples of fundamental misunderstanding include:

"For example, relational databases make complicated associations 
difficult," 

...which indicates no understanding of use of primary and foreign keys.  
It is the simplicity of these two building blocks that makes complicated 
relationships so easy to build.  Double-shame go to the author for 
failing to recognize the use of *composition*, a key OO technique, in 
the construction of complicated relationships.

We also have to hope this is just a typo:

"they [RDBMS] tend to "map" poorly into the OO world because they fail 
to implement the relational model 
<http://en.wikipedia.org/wiki/Relational_model>'s (did he mean 
Object-oriented models?) user-defined types."

Does my toaster "fail to implement" automobile brakes?  Might it be 
because you don't need brakes on a toaster? 

This one I can't ignore:

"In the object world there is a clear sense of "ownership 
<http://en.wikipedia.org/wiki/Ownership>", where a particular person 
object owns a particular phone number. This is not the case in 
relational databases"

As my daughter would say, OMG!!!  This guy needs to dig through 
wikipedia for something called 'row-level-security'.  In my databases a 
user can only see their own information, because they "own" it.  An 
admin is the guy that can see it all.  Not to mention that the table 
itself is the *fundamental* *mechanism* for associating attributes to a 
particular entity.

my last stab, from the very same sentence:

"...the tables have no idea how they relate to other tables at a 
fundamental level"

Foreign key anybody?  Look up the term "natural join" as well.

Oh, well, enough of this ranting, I'm putting some intro material on the 
Andromeda website today, and getting a new domain name, its only fun for 
so long to beat up on somebody's work, much more fun to perfect your own....



Baer, Jon wrote:
> For those not understanding the term or issues, Wikipedia has a great resource on it ...
>
> http://en.wikipedia.org/wiki/Object-relational_mapping
>
> - Jon
>
> -----Original Message-----
> From: talk-bounces at lists.nyphp.org on behalf of Hans C. Kaspersetz
> Sent: Fri 1/26/2007 6:21 PM
> To: NYPHP Talk
> Subject: [nycphp-talk] ORM
>  
> I can't believe that my group is the only group on this list that has 
> implemented ORM.  If you have implemented ORM, what challenges did you 
> face?  And how did you solve them?  What compromises did you choose?  
> Were they conscious or unconscious compromises?
>
> Hans
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