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I have a table class which have classId plus ids from 4 different tables,
I wanna know how I can make mapping for this.

Example table class have classId, profesorId, examId, classroomId

Class id have fields Professor professor, Classroom classroom, Exam exam,

Proffesor have set of classes, Classroom have set of classes, Exam have set of classes, and when I try to delete one class from Classroom it's only want
to assigned null to classroomId in table class

Anybody can give mi idea how to map this

Thanks

If you've got a Professor with a loaded set of Class objects, removing an object from the set will set that Class object's ProfId column to null. Class objects have to be deleted independently.

Obviously, this applies equally to all your other classes.

Thanks tenwit but with mapping like this if in table class have more profesors,
it will take just one register!
I dont know how to resolve it...

tenwit and what you think wnen you say delete separately?
Saludos

If you want a Professor to have many Classes, and a Class to have many Professors, obviously you many-to-many mappings instead of one-to-many/many-to-one. The same principles apply, though.

Can you rephrase your last question? I couldn't get the exact meaning.