FAQ
Hello!


I am trying to model a list of heterogeneous entities by having a
ListItem table where the list item entity is able to point to an
arbitrary entity (Person, Computer, URL, Movie, etc).


I don't want to use single-table inheritance natively supported by
Cayenne because of big database size overheads (the entities are
drastically different from one another). In fact I don't necessarily
want to use inheritance at all (PersonListItem, ComputerListItem,
etc), but this seems to be the only option in Cayenne to model such a
list.


I've read Mike Kienenberger's article
(http://cwiki.apache.org/CAY/compositeverticalinheritance.html) about
simulation of vertical inheritance in Cayenne and found that it might
be acceptable for my case.

But I am having problems generating classes from the velocity template

- Скрыть цитируемый текст -
given in the article, although I've used code generator parameters
recommended in article.


It seems the parser fails to parse ${objEntity.getClientSuperClassName()},

${anObjEntity.getClientClassName()}, although other methods/attributes
of "objEntity", "entityUtils", "stringUtils", "importUtils" are parsed
correctly.


I've tried with Cayenne 2.0.4, Cayenne 3.0M4.


Thank you,

Andrey Strib.

Search Discussions

Discussion Posts

Follow ups

Related Discussions

Discussion Navigation
viewthread | post
posts ‹ prev | 1 of 4 | next ›
Discussion Overview
groupuser @
categoriescayenne
postedJul 10, '08 at 10:03a
activeJul 10, '08 at 4:25p
posts4
users3
websitecayenne.apache.org

People

Translate

site design / logo © 2022 Grokbase