If I fetch an object from the database and change one of its fields and then save it, the sql update that is send to the database seem to update all of the colums relentlessly.

If some other process changed a value at the same time, that is overwritten when I save.

Solutions to that problem?

Idealy, use optimistic locking - see version mapping tag.

Thanks for the fast answer. But it seems like

<class dymamic-update="true"

solved the problem. Would it still be better to do the optimistic locking thing?

Hi,

This is only half of your problem, because some process can still overwrite your changes.
So david has right, use optimistic transaction (locking) to avoid this problem.

I hope this help
Calin