Hello,

I have a "small" question about how nhibernate works. Im programming an ASP form with a parent-child persistent class. Then parent class have IList associate to a bag in the xml mapping and define with cascade="all-delete-orphan" parameter.

In the form i show the parent details and a gridview with the IList elements, the user can modify the fields in the gridview. The user have the option to cancel the modifications, and for it, i create a temporary object and save the changes in the parent´s childlist. I save this object in the asp session until the user press the button cancel or update. If cancel the form reload the object and if press save execute SaveorUpdate(tempobject).

And now my question:

It works!!, nhibernate save/update or delete the columns but the problem is this: first of all it always execute an update for the parent object and all of the childrens independently of that the children is modified or not and then insert/update/delete the childrens.

I test it without store the tempobject in asp session and it works perfectly.

I use the NHibernate Best Practices system to manage nhibernate sessions and i think the problem is when i try to save a object with a session diferent than i retrieve from the BD, nhibernate think that all lines are changed.My question is only to confirm this, and if anyone have other idea to do it.

Thanks for all (and sorry for my english xD)

Other important problem, if the child collection is lazy and not yet loaded the program fail and not save nothing, a problem in the serialization i supose.

I continue work but im starting to think that this is not the best way to do it.

Maybe tempobject can be only the ilist of childs not the full parent object.

Post later more results :)

If you Update the object in a different session then NH does not know what has changed and delete and re-add all your children. If you are sure nothing has changed, you can try Session.Lock() on your parent with LockMode.None and that may prevent the extra queries.

Thanks grennis .
I test Session.Lock() because i dont know how it works.