Hi,
I have not used TOPLink before but I was planning to do so in the future.
Thank you for your remarks. I agree that those restrictions are not
acceptable. This shows that the TOPLink product is not mature enough.
-----Original Message-----
From: Volkmann, Mark [mailto:[EMAIL PROTECTED]]
Sent: vrijdag 3 september 1999 17:26
To: [EMAIL PROTECTED]
Subject: want confirmation of TOPLink restrictions
I've seen several messages discussing TOPLink on this list. I've been
evaluating it lately and have identified a number of restrictions it imposes
on the way your Java classes must be coded. I'm interested in hearing
whether others have run into these same restrictions. Am I off base on any
of these?
1) All object fields that are mapped to a database table column must either
be public or have both get and set methods that are public. There are many
cases when a class wishes to provide a get method but no set method because
the field is read-only.
2) Methods that provide access to collections must return the collection
object (ex. a Vector) instead of an object such as an Enumeration of
Iterator. There are many cases when a class doesn't want to do this because
it doesn't want to allow callers to modify the collection.
3) Every class on the "many end" of a one-to-many relationship must have a
field that holds a reference back to the "one end". There are many cases
when it is unnatural for that class to have knowledge of the other class.
Even worse, if a class can be referenced by collections in multiple other
classes, it must hold a reference back to each of them.
4) When using JDK 1.1, only Vector is supported for one-to-many mappings,
not Hashtable. JDK 1.2 must be used to utilize Hashtable and other
collection classes.
--
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