SaveOrUpdate Method in Web Applications - How to use it?

mdsrlz · **Posted:** Thu Sep 14, 2006 9:31 am

Hi!

I would like to know how do you use SaveOrUpdate method in Web Applications. I can't see how to use this method :(

Every time I have one status that says: Updating or Inserting. So, everytime too, I test this status and call Save or Update.

Can you show some sample? :-)

Tks

martijnb · **Joined:** Sat May 14, 2005 8:40 am **Posts:** 130

SaveOrUpdate uses the unsaved-value attribute in the mapping file (<id>) to determine if an insert or update is required.

For example, I always use an unsaved value of -1 for the primary key and set the initial value of the primary key field to -1 in the constructor. Now when NHibernate gets called with SaveOrUpdate() and it finds -1 as the primary key value, it knows that an insert has to be performed and no update.

gert · **Joined:** Thu Jan 19, 2006 4:29 pm **Posts:** 348

martijnb wrote:

SaveOrUpdate uses the unsaved-value attribute in the mapping file (<id>) to determine if an insert or update is required.

Correct is "SaveOrUpdate uses the unsaved-value attribute in the mapping file (<id>, <version> or <timestamp>) to determine if an insert or update is required. "

Gert

martijnb · **Joined:** Sat May 14, 2005 8:40 am **Posts:** 130

gert wrote:

martijnb wrote:

SaveOrUpdate uses the unsaved-value attribute in the mapping file (<id>) to determine if an insert or update is required.

Correct is "SaveOrUpdate uses the unsaved-value attribute in the mapping file (<id>, <version> or <timestamp>) to determine if an insert or update is required. "

Indeed you're right. When typing this, I already had a slight feeling that I was missing something :). Thanks for pointing this out.