You are right James. All the optimization of finders in the world can't fix
all the
network round trips you refer to!
> -----Original Message-----
> From: James Cook [SMTP:[EMAIL PROTECTED]]
> Sent: Monday, October 04, 1999 8:50 PM
> To: [EMAIL PROTECTED]
> Subject: Re: Doubts about Entity beans, Should we use them?
>
> I'm sure I'm missing the point. We are trying to demonstrate why BMP
> cannot
> be optimized as much as CMP. We are also looking hard at the finder method
> for entity beans. To find orders with balances > $100 we would have the
> following BMP query in the Order home...
>
> public Enumeration ejbFindByBalance(BigDecimal amount) throws ...
>
> in this finder we will issue the appropriate SQL to create a bunch of
> Primary Key objects and stuff them into an enumeration.
>
> If the client is the GUI side of an application and wishes to stuff the
> customer names from these orders into a list box, a separate remote call
> would be necessary to obtain the names. This would be required whether
> using
> CMP or BMP, and you should be whipped with a wet noodle for not using a
> session bean.
>
> So what's the deal with CMP? Can the containers optimise the subsequent
> remote getCustomerName() calls because they instantiated all of those
> objects when they did the original finder query? If so, wouldn't this be
> an
> incredible waste of time if my client simply wanted to report the number
> of
> large orders?
>
> I'm not sure if I see the scenario that is causing the grief. Please help.
>
> jim
>
> > -----Original Message-----
> > From: A mailing list for Enterprise JavaBeans development
> > [mailto:[EMAIL PROTECTED]]On Behalf Of Chris Raber
> > Sent: Friday, October 01, 1999 6:35 PM
> > To: [EMAIL PROTECTED]
> > Subject: Re: Doubts about Entity beans, Should we use them?
> >
> >
> > Muly,
> >
> > Yes the spec is written that way. But there is nothing that says your
> BMP
> > implementation can't cache the results of the initial query. Some BMP
> > generators <vendor> Cocobase </vendor> will write this code for you...
> >
> > -Chris.
> >
> > > -----Original Message-----
> > > From: Muly Oved [SMTP:[EMAIL PROTECTED]]
> > > Sent: Friday, October 01, 1999 4:51 PM
> > > To: [EMAIL PROTECTED]
> > > Subject: Re: Doubts about Entity beans, Should we use them?
> > >
> > > >If the original request was "Get me all employees", then the
> > > corresponding
> > > >find()
> > > >method in case of BMP might use one query
> > >
> > > >SELECT PKEY, FNAME, LNAME FROM EMP
> > >
> > > >to build the enumeration of primary keys AND entity bean for each
> > > employee,
> > > >which
> > > >will remain in cache until used by the caller.
> > >
> > > I don't think this can be done with BMP, as the result of the ejbFind
> > > should be an enumeration of primery keys, then the continer take every
> > > primery key and use ejbLoad to load the rest of the fields.
> > >
> > > The spec limit the way this find is solved, this is where CMP has more
> > > space for optimization.
> > >
> > > muly.
> > >
> > >
> >
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