Hibernate save to get sequences a second time.

Question

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 B b;
       private C c;
 }

i'm creating this object and saving it to the database.

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

saveOrUpdate(a)

so i can 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 works 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 "

Any ideas?

(can't post the code because it's too long and messy, but it's basically that)

Answer 1

if C is an hibernate mapped class and the propery is correctly mapped, than hibernate will detect that the property C has changed in will save it for you when the session flushes or the active transaction will commit. Then it is possible to get the id of C after the commit.

An other approach is to call saveOrUpdate(c). In that case c get an id assigned, so you can retrieve it.

What checks are you doing that you need c's id?