----- Original Message -----
From: "Robert Cummings" <robert@xxxxxxxxxxxxx>
To: "Satyam" <Satyam@xxxxxxxxxxxxx>
Cc: "Deckard" <ml@xxxxxxxxxxx>; <php-general@xxxxxxxxxxxxx>
Sent: Thursday, October 05, 2006 11:16 AM
Subject: Re: Help on objects
On Thu, 2006-10-05 at 07:04 +0200, Satyam wrote:
I've seen you already had a good answer on the errors in the code so I
won't
go on that. As for OOP, the one design error you have is that you are
asking for an action, not an object. You want to make SQL inserts, that
is
your purpose, and that is an action, which is solved by a statement, not
by
an object. There is no doer. Objects are what even your English
teacher
would call objects while describing a sentence. You are asking for a
verb,
you don't have a subject, you don't have an object. Of course you can
wrap
an action in a class, but that is bad design. Classes will usually have
names representing nouns, methods will be verbs, properties adjectives,
more
or less, that's OOP for English teachers.
Properties are very often nouns in addition to adjectives. For instance
a linked list class will undoubtedly have noun objects referring to the
current link, the next link, etc.
Cheers,
Rob.
--
Indeed, they often are: you as an object are defined by properties such as
height, color of your hair and many other adjectives and you have many other
objects which define you, fingers, legs, etc, which are also properties.
Being more detailed, instead of the color of your hair being a property of
you as a whole, you might have a property pointing to a hair object (a noun)
which has a color property.
Other noun properties might not be so helpful in defining you, your friends
might give a hint of who you are, your clients do not. But, after all,
neither does your hair, mine is deserting me and I'm still myself. So, I
would say that while adjectives define an object, nouns are relations in
between objects and might not define neither.
Anyway, I didn't mean this analogy to be complete, nor I mean to teach OOP
to English teachers, and though it can be talked much about, stretching it
too far would certainly break it. I don't mean to defend it very strongly.
Cheers
Satyam
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