Lazy loading eager loading

dnoyeb · **Joined:** Sat Dec 16, 2006 1:52 pm **Posts:** 40

I have an object that has children.

class Parent {
List children;
}

The children are lazy loaded. But I want them to be all loaded or none loaded. I do not want them loading one at a time. And I do not want them automatically loaded every time I load "Parent."

What is a good strategy to force all the children to be loaded at once when I am ready for them? Once this collection is loaded, it will change outside of a session. At some point I will want to have the changes saved. What is a good strategy for getting children updated to its new state?

I have been reading the documentation, but am quite new and recently from JDO which I know how to do this in. Wondering how I can do this with Hibernate.

Thanks!

scarface · **Joined:** Sun Jun 04, 2006 1:58 am **Posts:** 136

dnoyeb wrote:

I have an object that has children.

class Parent {
List children;
}

The children are lazy loaded. But I want them to be all loaded or none loaded. I do not want them loading one at a time. And I do not want them automatically loaded every time I load "Parent."

What is a good strategy to force all the children to be loaded at once when I am ready for them? Once this collection is loaded, it will change outside of a session. At some point I will want to have the changes saved. What is a good strategy for getting children updated to its new state?

I have been reading the documentation, but am quite new and recently from JDO which I know how to do this in. Wondering how I can do this with Hibernate.

Thanks!

fetch = "subselect"

dnoyeb · **Joined:** Sat Dec 16, 2006 1:52 pm **Posts:** 40

I don't understand? Is this java code or metadata for the xml file?

batmat · **Posted:** Sun Dec 17, 2006 2:36 am

Anyway subselect is not yet supported in the code (by FetchMode for example).

So you just have to add the attribute fetch="subselect" in your <bag name="children" ...> (or <list>, anyway) line in your hbm.xml file.

dnoyeb · **Joined:** Sat Dec 16, 2006 1:52 pm **Posts:** 40

If I understand correctly, fetchmode does not have much to do with laziness directly. fetchmode just controls how much is fetched when something actually gets fetched. It does not control when something actually gets fetched.