Saving a large tree

matt_dowell · **Joined:** Sat Oct 18, 2003 11:53 am **Posts:** 55

I have a tree of related entities, like so:

Module
|-ReportModule
|-Report
|-ReportFields .....

It is a configuration that I have cloned from another users configuration. I want to persist this (copy a users confuguration). What is the best way to do this?

Do I have to traverse the tree and methodically call save, update on all the nodes?

Matt

emmanuel · **Posted:** Wed Oct 22, 2003 5:06 am

Did you look at the cascade attruibute in relationship tags ?
cascade="save-update" might be appropriate to you

matt_dowell · **Joined:** Sat Oct 18, 2003 11:53 am **Posts:** 55

The hibernate docs say you have to save an entity before you can save the relationship to a parent entity...

This always confuses me about cascades, just when I think I have them figured out, I don't.

If I have a large tree, and I have cascade="all" and I call session.save(Parent) will it save all the chillen?

Thanks,

matt

gavin · **Posted:** Thu Oct 23, 2003 1:21 am

Thats the whole point of cascades isn't it??

matt_dowell · **Joined:** Sat Oct 18, 2003 11:53 am **Posts:** 55

Of course your right, I think my problem is I am calling clone() on a large tree and looping through all the children and setting the keys=null in the hopes that when I save the parent it will save the tree. It is not, it is only saving the top node of the tree.

I am guessing at this point that the cloned() objects have some internal ID that the session is getting confuded on?