Nhibernate 'save' & # 8594; 'get' problem

Question

Hello,

I use nhibernate and have problems registering a user on my site.

When a user wants to register, I create a new user account in the database and, strangely enough, after that the system registers the user.

Well, here’s the problem ... When I create a user account, I use

NHibernateSession.Save (legal entity); // does not save the user object immediately to the database. It is stored in the session.

And when I want to log in, I load the user by his username, and then get the null user object.

Why am I getting a null object and how can I make it work?

thanks

Answer 1

Ok, I just experienced this:

        ISession session = s.CreateSession();

        User user = new User();

        user.Number = 122;
        user.UserName = "u";
        user.Id = 1;

        session.Save(user);
        User user1 = session.CreateCriteria<User>().Add(Restrictions.Eq("UserName", "u")).UniqueResult<User>();

        session.Flush();

First you select from CreateCriteria, and then to reset the insert. Therefore, so that he does not find anything.

I also tested with Get<User>(1)and returns the object passed to the Save method - the request is not executed.

However - why query the database since you have an entity?

In addition, you say that you use Get, and then say that you want to load UserName - is UserName the main key? Try loading the primary key.

Answer 2

If your Save and Get are executed from different sessions, then Get will return null, because the object exists only in the internal cache of other sessions until it is discarded.

, L2 ( , L2 Save Flush).