[jboss-user] [EJB 3.0] - Re: Database triggers and entity beans

busitech do-not-reply at jboss.com
Thu Oct 19 19:28:32 EDT 2006

Please let us know if you find a nice way to do this.  This limitation of not being able to use the entity manager during callbacks is really a problem!

We are trying to find a clean way to set up simple calculated properties of an object which are assigned a value automatically when it is loaded, such as the sum total of one column, or even a count, from objects on the other side of a OneToMany association.

A concrete example would be to add a YTDSales property to a Salesman object, or an ItemCount property to a Manufacturer object.

There is a @Formula annotation which can contain an SQL string, and the docs state that a subselect can even be performed.  However, we would really prefer to stay in Java working with objects!

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