Hi,


I'm trying to understand the purpose of setReadOnly() method of hibernate's session class.

I have the following (pseudo)


Apparently, with this code, the name of the cat is not going to get updated to 'changed', even
though I've flagged the setReadonly as 'false'.
Also... even if I remove the call to session.setReadonly(cat, true), the cat is never going to get updated.
I've done a bit of reading... and apparently by setting setReadOnly(..,false), the 'loaded' state is going to
get synced with the current state, hence Hibernate's dirty checking always return false (which means
object changes is not going to get persisted?).... if so.... what is the purpose of giving the boolean parameter
to setReadOnly method?


Am I missing something here? Maybe the method name is misleading? Apology if the pseudo code
above is not clear... but I hope you get the idea..





Regards,


Alex.

When you set the read only flag as true


it tells the hibernate not to maintain the snapshot of this object. Changing any property of persistance object will not result in update. As the snapshot of object is not there for dirty checking.



This will indicate hibernate to maintain snapshot for cat object. This code will work as expected if changes are made after setting the readOnly flag false. In that case hibernate
will compare it to old snapshot of cat object and update database.

Hi,


Thanks for the reply. I've just written a simple test myself, and confirmed the behaviour as you described.
Here is what I observed:

after the call above, cat will have the name 'frank'..

but... if I do the following:


That cat will still have the name 'bill'. In my case, I need to call the 'setReadonly(true)' before the changes made to the object, and I want to call 'setReadOnly(false)' at some point later (after the changes get applied to the object), and get the changes get persisted..... can anyone suggest a solution?



Thanks in advance!



Regards,


Alex.