EJB Container CMP Implementation?

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Wolfgang Keller - 04 Sep 2003 23:09 GMT

Hi all,
I've got the following questions concerning CMP (Container Managed
Persistence)
in J2EE // EJB Containers:
* if a container implements CMP for EJB are there containers that still
offer
"handcraftet" mappings (e.g. by a user provided config file)
* or does CMP automatically imply that the container uses some kind
of OODB below - which is hidden from "curious users"
* are there different strategies by different vendors to handle this issue?
Any URLs to descriptions very welcome

Thanks
Wolfgang

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Jon Martin Solaas - 05 Sep 2003 10:35 GMT

> Hi all,
> I've got the following questions concerning CMP (Container Managed
[quoted text clipped - 10 lines]
> Thanks
> Wolfgang

Most CMP containers are configurable. CMP doesn't imply anything with
respect to storage, other than managed persistence.

Most containers will use a relational database as storage and provide a
vendor specific means for mapping beans and fields to tables and
columns. All the "magic" is usually described in the manual of the
product, which is often available on the web. Just search for "oo
relational mapping cmp" or something on Google. Here are a few ...

http://orionsupport.com/archive/articles/complex-or.html

http://edocs.bea.com/wls/docs70/ejb/cmp.html#1093392

http://prdownloads.sourceforge.net/jboss/QuickStart-30x.pdf?download (p.
108 +/-)

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EJB Container CMP Implementation?

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