On 11/12/05 7:46 PM, Mark D. Anderson wrote: > I misspoke, there does seem to be one CPAN object-relational package > that has some documention and support for inheritance mapping: > Tangram.
The Tangram docs have an interesting statement on the disadvantages of "filtered mapping" > This mapping is very questionable according to relational orthodoxy. Even if > one decides to forgo these rules, using such a mapping takes away many of the > interesting features offered by modern RDBM systems. Because nearly all the > columns must allow NULL values, we cannot take advantage of features like > referential integrity constraints, domain constraints, indexes, etc. I agree that it files in the face of "relational orthodoxy," but it certainly doesn't mean that referential integrity constraints and indexes are no longer applicable, or even any less effective. I mention this because filtered mapping seems like the easiest technique to support with RDBO, so it'll probably be the first one I tackle. Am I missing something here? -John ------------------------------------------------------- SF.Net email is sponsored by: Tame your development challenges with Apache's Geronimo App Server. Download it for free - -and be entered to win a 42" plasma tv or your very own Sony(tm)PSP. Click here to play: http://sourceforge.net/geronimo.php _______________________________________________ Rose-db-object mailing list Rose-db-object@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/rose-db-object
