I have recently started learning NHibernate and am struggling to find
documentation on how to handle updates in a set.
For example, I have an order object with a one to many relationship to
transaction. My transaction table has a foreign key OrderId. The xml
for my mapping is:
<set name="Transactions" table="Transactions" inverse="true"
lazy="false">
<key column="OrderId"/>
<one-to-many class="Transaction"/>
</set>
What I would like to do is to add transactions like so:
Order order = repo.GetById(id);
Transaction tx = new Transaction();
order.AddTransaction(tx);
repo.Update(order);
When I issue ISession.Update I would expect that any new transactions
added to the Order object are saved to the database (via an insert
command).
In order to achieve this I set the cascade attribute for the above
set.
However, in addition to adding any new transactions an update command
is issued for every existing transaction (I have checked in NHProf and
an update command is generated for each transaction setting all
columns to the original values).
Have anyone got an example (or perhaps a link) to an example that
demonstrates how this should work?
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