Creating a Child with Parent's Foreign Key Value

guinsu · **Posted:** Fri Aug 04, 2006 12:19 pm

I'm trying to create a child object that is linked to a parent object. The problem is I am attempting to retrofit this into an application that used a lot of SQL SPs and at the point where I create the object I only have the value of the Parent's unique ID, not the whole object.

What is the best practice for creating the child object? Do I need to lookup the parent first? It seems a bit silly since I know all that will get put in the child table is the FK value that I've got. I did some searches but didn't come up with anything.

pasha · **Joined:** Sat Nov 27, 2004 4:13 am **Posts:** 137

we've done such thing in our applications lots of time, just do as this:

Code:

Parent parent = new Parent();  // you have the default constructor
parent.setId(providedParentId);

child.setParent(parent);

session.save(child);

Hibernate just uses the parent's ID for creating the relationship if cascade attribute does not contain UPDATE.