Question

How not to update some properties of object with NHibernate?

For example:

var user = new User();
user.Id = 5;
user.Name= "afsf";
user.Login = "asdfsf";

and password propery by default is null,

user.Password == null;

.....

session.Update( user )

How not to update Password property?

Answer 1

You can load the user from database, before updating.

var user = session.Get<User>(5);
user.Name="username";
...
session.Update(user);

Also, you can map 2 classes, one with info about the user settings, like name, email and so on, and another one with info about the user login, login and password.