persistence powertier 5.0 has a pretty robust system.
but I do agree, don't deploy a database dependent system without a good
DBA,
Filip
Filip Hanik
Engineering Manager/Architect
Verge Software
Phillip Lindsay
<plindsay@EBUILT. To: [EMAIL PROTECTED]
NET> cc:
Sent by: A Subject: Re: EJB-INTEREST Digest - 19
Jan 2000 to 20 Jan 2000
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Enterprise
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<EJB-INTEREST@jav
a.sun.com>
03/21/00 02:39 PM
Please respond to
plindsay
IMHO, I don't see a robust large scale system deployed with CMP (yet).
The
idea that any large system is deployed without a significant DBA role is
scary. No matter how much testing and design, in any heavily utilized
RDBMS based production system there will always be a need for RDBMS schema
tweaks out of band of the software components.
To get better transaction performance you will be forced into BMP.
-phil ([EMAIL PROTECTED])
Phillip A. Lindsay
eBuilt, Inc - http://www.ebuilt.com
> -----Original Message-----
> From: A mailing list for Enterprise JavaBeans development
> [mailto:[EMAIL PROTECTED]]
> Sent: Friday, January 21, 2000 12:01 AM
> To: Recipients of EJB-INTEREST digests
> Subject: EJB-INTEREST Digest - 19 Jan 2000 to 20 Jan 2000 (#2000-20)
>
> The model I described is the one you should be pursuing. And a good CMP
> engine should allow you to persist a graph of objects. Sadly, not all
> EJB servers can do that. It's a shame considering such solutions have
> existed in the industry for years.
>
> If your EJB server is one of the many that only persist one object to
> one table, then you have to go around by either making all the objects
> entity beans, or implementing ejbLoad/ejbStore in Order to deal with
> PurchaseOrder. But in that case, you might as well do everything BMP and
> save some performance.
>
> The spirit of the EJB specs is very clear, it's just that not all EJB
> servers fulfill the true needs that are not explicitly expressed in the
> specs.
>
> arkin
>
>
> Nathan Phelps wrote:
> >
> > I understand what you are getting at here, however my main
> concern is that
> > since a Purchase Order most likely represents data, it is going
> to have to
> > know how to talk to the storage mechanism. In other words, all the
> > wonderful services EJB offers (like CMP) don't directly apply to the
> > PurchaseOrder class because it doesn't implement the EntityBean
> interface.
> > I will either have to code JDBC in the PurchaseOrder class or
> create data
> > objects for the class to use. This will definitely effect the
> portability
> > of the object in my mind. So how can I implement these "helper"
classes
> > without violating portability?
> >
> > Thanks,
> >
> > Nathan Phelps
> > solarc.com
> >
> > > -----Original Message-----
> > > From: Assaf Arkin [SMTP:[EMAIL PROTECTED]]
> > > Sent: Tuesday, January 18, 2000 9:48 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: Fine-grained data in container managed entity
beans
> > >
> > > public class Order
> > > implements EntityBean
> > > {
> > > PurchaseOrder pOrder;
> > > Vector lines;
> > >
> > > . . .
> > > }
> > >
> > >
> > > public class PurchaseOrder
> > > {
> > > }
> > >
> > >
> > > public class OrderLine
> > > {
> > > }
> > >
> > > arkin
> >
> >
> ==================================================================
> =========
> > To unsubscribe, send email to [EMAIL PROTECTED] and include
> in the body
> > of the message "signoff EJB-INTEREST". For general help, send email to
> > [EMAIL PROTECTED] and include in the body of the message "help".
>
> --
> ----------------------------------------------------------------------
> Assaf Arkin www.exoffice.com
> CTO, Exoffice Technologies, Inc. www.exolab.org
>
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