difference between ISession.Save & ISession.Flush

deepakbadki · **Joined:** Thu Aug 24, 2006 2:05 am **Posts:** 80

Hi Group,

Please do let me know the difference between ISession.Save and ISession.Flush.

Thanks,
Deepak

canton · **Posted:** Tue Dec 12, 2006 3:50 am

ISession.Save(obj) tells the NHibernate session that the obj needs to be inserted to database. (The INSERT SQL statement is not yet fired)

ISession.Flush() fires the INSERT SQL statement (and all other operations that you have told the NHibernate session by Update(),Delete(),etc) to database.

deepakbadki · **Joined:** Thu Aug 24, 2006 2:05 am **Posts:** 80

Hi Canton,

In our application, whenever application invokes ISesion.Save method, NHibnerate fires a query to the database to perfrom insert opeation.
Does it require any setting in mapping file?

FYI: I am using 1.2.0 Beta1 NHibernate version

Thanks,
Deepak

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

deepakbadki wrote:

In our application, whenever application invokes ISesion.Save method, NHibnerate fires a query to the database to perfrom insert opeation.
Does it require any setting in mapping file?

It depends on IdGenerator class configured. NHibernate needs to assign the ID to object during the "Save" call, so in case of MS SQL identoty, it needs to perform insert. In case of Oracle sequence, the next id is obtained from sequence. etc.

Gert