I am using the 3.2.6 release of Hibernate Core, the 3.3.2 release of the EntityManager, and the 3.3.1 release of Annotations.

I have an interesting problem with mapping several objects with single table inheritance:

I have the following objects:





This works very well, except for one problem: In some cases the "code" value in TEST_TABLE is blank (not null, just a blank string). In those cases, I don't want them to be considered valid ChildObjects and I need a way to discriminate against them.

Can somebody suggest a way that I can do that? I've looked at DiscriminatorFormula, but I can't find enough examples to understand how it might help me.

I'm very willing to go a little outside the box with this and use hibernate propriatary extensions, and the like.

Thank you so much.

I seem to have solved my own problem. With some experimentation and all the logging turned on for hibernate, I was able to discover more about how the DiscriminatorFormula annotation works.

I solved my problem as follows:



This seems to work for my case. However, I do think it would be nice is there was an annotation or ability to allow me to add a where clause to the class itself, perhaps using the existing @Where annotaion.