so you are promoting using what?
Do you have an example of:
Your code -> datastore
thanks,
Matthew
-----Original Message-----
From: Pete Beck [mailto:[EMAIL PROTECTED]]
Sent: Thu 1/9/2003 1:35 AM
To: [EMAIL PROTECTED]
Cc:
Subject: RE: [JBoss-user] Cmp vs hibernate
On Wed, 2003-01-08 at 22:45, Matthew Baird wrote:
> I disagree with your statement of
> "Let's face it, O/R mappings will never be very efficient. "
>
> Both OJB (to which I contribute) and Hibernate (which I watch closely)
> approximate raw JDBC performance in most cases, and can exceed it in many
others.
> Go check out the performance target in OJB, and Hibernate documentation
> goes over performance extensively. Both are GREAT projects, but neither is
CMP.
Yes, but here you are making the assumption that JDBC is efficient,
which it isn't.
JDBC is an abstraction layer itself, as it the SQL (which must generally
be parsed and compiled) that it executes.
If you think about the big picture, you will notice how much extra work
is being done just to make the relational model fit the object model.
O/R mapping layers:
Your code -> O/R mapping layer -> JDBC -> SQL -> datastore.
That's quite a lot of repackaging before you finally access the
information in the database. The above will *never* be as efficient as
this:
Your code -> datastore.
But even this could be an improvement:
Your code -> CMP layer -> datastore.
Additionally, relational databases are usually separate processes, so
JDBC also loses out because of the IPC/RPC and the marshalling and
unmarshalling of data.
Performance would be dramatically improved if the datastore was in the
same process and had a minimal amount of marshalling to do.
--
Peter Beck BEng (hons) - Managing Director, Electrostrata Ltd.
http://www.electrostrata.com --+-+-- Experts in e-business and e-commerce
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