Hi,
<rant>
If java supported parameterized classes, you'd only have to write one
primary key
class for simple data types. Get it working once and it works for all.
Change it
once for all. Tell me again why java doesn't need parameterized classes?
</rant>
Heh, another former C++ dev'er? First you want parameterized classes. Next
you'll want operator overloading. Then it's multiple inheritance. Pretty
soon, we'll be back to square one! :-)
Gene
-----Original Message-----
From: A mailing list for Enterprise JavaBeans development
[mailto:[EMAIL PROTECTED]]On Behalf Of Victor Langelo
Sent: Wednesday, August 02, 2000 6:14 AM
To: [EMAIL PROTECTED]
Subject: Re: int as Primary Key
Shiv Kumar wrote:
> Hi
>
> One of the replies said that it would be unmanageable if you have a lot of
> entity beans and a separate PK class is not used. Can you explain me more
on
> that?
The two word answer is type safety. For example, given two entities, Contact
and
Company, which both have an int primary key, what would prevent using
primary key
obtained from a Contact as the primary key in say
CompanyHome.findByPrimaryKey?
Nothing. In a simple system with only a few entities, this is unlikely to
happen.
But with a complex system with a hundred or more entities and dozens of
developers
working on deadline, it will happen and may not be easy to find in testing
or code
reviews.
>
>
> Becuse, I dont really see any disadvantage in using java.lang.Integer or
other
> wrapper classes for primary key fields. At least now I dont have to write
my own
> PK classes (less bugs :-).
You only need to write one class for each data type. Actually you only need
to write
one class and then copy if with minor changes for the other data types. You
then
subclass these classes for you primary keys. Composite keys will require
additional
classes, but it would in with scenario.
--Victor
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