Hibernate derived property with xml mapping

Question

I have a Detectable class with a Revisions set, which are Hibernate managed POJOs. I\'m also mapping my entities using hbm.xml files. Wh

Answer 1

I finally achieved it with this code:

<property name="_LastRevisionDate"
        formula="(select MAX(rev.start_date) from trevision rev where rev.id_detectable = id_detectable and rev.status != 'DRAFT')"
        type="date" />

Where id_detectable is my current entity key column.

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UPDATE

Another workaround is to use a DB view to obtain the last revision date. Then, there's the choice to map the Entity against that view instead of the original table.

Answer 2

What is the sql syntax error? Did you try replacing _Id with id?