call save on an already persistent entity

[eszechet]

I have a class like this (with getters and setters, all mapped to hibernate, each with a sequence to oracle DB)

public class A{
private int id;
private B b;
private C c;
}

classes B and C are simple classes also mapped with ids mapped to sequences

i'm trying to create an object "A" and save it to the database.

So i create an A object and populate it with a B object and call

saveOrUpdate(a)

so now i have "a" and "b" sequences generated. Then i do some calculations and create an instance of "C" and set it to "a"

Up to here, everything's great. I now need to get "c"'s id so i do some checks before i flush and commit.

But saveOrUpdate won't work here because the object is no longer transient.

According to hibernate docs on saveOrUpdate: "if the object is already persistent in this session, do nothing "

(can't post the actual code because it's too long)

Any help is appreciated


Thanks

[jamestastic]

Then i do some calculations and create an instance of "C" and set it to "a"

How do you do this? Are you doing A c = new A(); and setting the properties, or are you doing A c = a;?

If the former, then Hibernate will not consider c to be transient, as it is not the same instance as a. If the latter, then c is the same object as a, and Hibernate will treat it as such.

[eszechet]

Thanks for you reply.

Actually, "a" "b" and "c" are of different classes.

I do something like:
A a = new A(),
B b = new B();
a.setB(b);

call saveOrUpdate on "a" here, so i can get a.id and b.id

C c = new C();
a.setC(c);

Now, i need to get c.id so I can do some things with it. (**)

Then flush and commit.

(**) Here, if i call saveOrUpdate on "a" again it does nothing because "a" has already been made persistent in this session...
And i cant flush earlier because of some DB constraints.

[jamestastic]

What happens if you use update() instead of saveOrUpdate()?

[eszechet]

It's just the same, org.hibernate.impl.SessionImpl internally calls a saveOrUpdate() when you call update().