Hi

I've just started using Hibernate so this may appear as a naive question.

Let say I have 2 data objects: Server and Log.
a Server can have many logs and a Log belongs to one Server only.

Server has a serverId (sequence in PostgreSQL) and a Set getLogs() method. The method getLogs() uses lazy loading.
Log has a logId (sequence in PostgreSQL) and a Server getServer() method.

Now what's the best or recommended (for performance reason or correctness) way to create a new Log?
a)


b)


Also my understanding is that once a Server object is retrieved from the db and providing we're in session a call to getLogs() will lazy load the Set of Logs. Isn't that a performance hit when at some point the Set of Logs for a Server object will be huge?
I could probably have the same result by retrieving all Logs belonging to a Server with a from... where query.

It's far less obvious that I thought to break away from SQLish thinking ;)

Thanks.

For correctness:



For performance, this is far less obvious. Problem with this code is that adding a new log will load the entire set. If you are going to have lots of logs, I would personally not map this relation as bidirectional but only from the many-to-one side. Have a look at the docs chapter 14.

About the call to getLogs(), you are nearly correct: it is only when you call a method of the returned set that the collection will be loaded.