Hi Dale,
Dale Newfield wrote:
Rob Hills wrote:
My problem arises when using this last form. If I watch the database
while navigating through the Grandparent edit form to the Parent edit
form, I see that the version number for the selected Grandparent
record increments once when going to the Grandparent edit form and
then again AFTER going to the Parent edit form. Hence, when I submit
the Parent edit form, it's rejected because it has the wrong version
in its hidden field. If I use Firebug to increment the hidden
version on the Parent edit form, it saves without a problem.
I don't understand why displaying an edit form (inherently a read-only
task) should effect the version number? I would assume the version
numbers should only be changing when a save happens...
From my understanding of Hibernate, each time hibernate loads an entity
for editing, it increments the version number in the DB. That is its
method for preventing multiple concurrent edits from overwriting
one-another. I believe, it works like this:
A record sitting in the db has the version no 0.
User A opens a form to edit the record and hibernate increments the
version to 1. User A then and goes off for coffee without saving his edits.
User B opens a form to edit the same record. Hibernate increments the
version to 2. User B has had enough coffee already and completes his
changes and clicks the "Save" button. Hibernate compares the version
number presented by User B's app (2) against the DB, finds they're still
the same and allows the data to be saved.
User A comes back from his coffee, finishes editing and clicks "Save".
Hibernate compares the version of User A's data (1) with that in the DB
(2) and bugs out with a "Stale Object"
exception.
If anyone who knows this stuff better than I do sees anything wrong with
this potted description, please pipe up.
Cheers,
Rob Hills
Waikiki, Western Australia
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