Question

Model: User
     id
     username
     role

Controller:update(User u)
  User old = User.findById(u.id);
  if  u.role NOT equals old.role
       .......

The Problem is: User.findById(u.id); , this code return the user is not as same as PARAM u, NOT the data in database.

How can i get the DATABASE value?

Thanks for your help!

Answer 1

The question is really confusing. Do you mean that when you make the call findbyId(u.id) that the old.role is returning the value found in the u parameter and not the value found in the database?

If that’s the case, maybe you can try something like this:

JPA.em().detach(u);
User old = User.findById(u.id);
if (!u.role.equals(old.role)) {
    ...
}

If you actually need to make changes to the User u that was detached, you will need to do this:

// this will attach the user back to the hibernate session
User merged = JPA.em().merge(u);
// do something like updating the merged user
merged.property = someValue;
merged.save();