Simple update

rferj · **Joined:** Mon Feb 04, 2008 7:24 pm **Posts:** 6

Hi.

I created a class with 4 properties (one of them is my pk property). Then I wrote a code to update this object on my database. If I need to update all the four properties all is ok, but suppose I need to update just one of the properties? For example:

Code:

Dim c As New Customer

c.Id = 1
c.Address = "New address here" 
c.Name = ? ' I don't need to update this property
c.Birthday = "New date here"

MySession.Update(c)
MySession.Flush

If I simply don't call the Name property I receive an error. How can I tell NHibernate to not update the Name property?

TIA,
rferj

wolli · **Posted:** Sun Mar 23, 2008 8:23 am

That's not the way you use hibernate. Normally you first retrieve the object from the database, then you make your modifications, then you persist your changes. Something like:

Code:

Customer c = session.Get<Customer>(1)
c.Address = "New Address";
c.Birthday = "New Birthday";
session.Flush();

or if you close the session after retrieving the object:

Code:

Customer c = session.Get<Customer>(1)
session.Close();
...
c.Address = "New Address";
c.Birthday = "New Birthday";
...
<get new session>
session.Update(c);
session.Flush();