Makes it possible use oclPS in any OCL expression.

Expression template

SomeClass.PSEval(SomeClass.allinstances->select(x|x.name=vWhatever),maxfetch,offset,dependon)

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.

For example this expression from a method having "userName" as a parameter

SysUser.PSEval(SysUser.allinstances->select(su|su.Username=userName),2,0,'')

Always remember that your SQL-server might also need indexes and other performance settings to be able to execute your expression efficient.

See also Sqlpassthrough