Hi All,
Our team is transitioning from traditional Java/Servlet/JSP and RMI to
exploring the
EJB model. We are having some difficulties with the concept of a "table" on
our legacy
system and what the translates to with EJB (entity bean). What happens when
you want to
join two or more tables? Now we just take advantage of SQL and have the RMI
class contain
the assimilated information. What is the best way to achieve this in EJB
(entity vs. session or
perhaps the idea of a "super" entity bean or can a single entity bean have this
knowledge)?
Does this also provide an abstraction layer to correctly make decisions on
normalizing the
data model (as some of our legacy architecture lacks proper normalization)? I
suppose the
reverse (denormalization) can also be true for performance reasons?
[EMAIL PROTECTED] on 29Oct1999 12:48 AM
To: [EMAIL PROTECTED]@INTERNET
cc: (bcc: John B. Geurink/0M/Caterpillar)
Subject: Re: Q: Bean Reference
Retain Until: 11/27/99 Retention Category: G90 - Information and
Reports
Caterpillar Confidential: Green
Hey
Wei Jiang wrote:
> Entity Bean representes a piece of data in *one*
> database. If you have two database, even there
> the table name, column name and primary keys are
> the same, they are different pieces of data. They
> can not be represented by the same bean.
That is incorrect. I understand what you're getting at, but the thing is
that an EntityBean may consist of data from one or more databases. There
are no restrictions on where the data should come from.
/Rickard
--
Rickard �berg
@home: +46 13 177937
Email: [EMAIL PROTECTED]
Homepage: http://www-und.ida.liu.se/~ricob684
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