Makes it possible use oclPS in any OCL expression. Using this you can "reach into" the database from OCL and action-language (EAL)
Note! - PSEval don't subscribe on sets from db. To make the operator auto-updating, provide an expression in "dependon" that when changed should also rerun the PSEval expression. This can for example be a timer.
Uppdrag.PSEval(self.Uppdrag->select(u|u.Aktivt)->orderDescending(u|u.Startdatum), 1000, 0, self.Uppdrag)
For example this expression from a method having "userName" as a parameter
Always remember that your SQL-server might also need indexes and other performance settings to be able to execute your expression efficient.