Hi,

My problem looks something like this:

- There is a bank account (parent) and the account has a history of transactions (children). Here is what my parent class (Account) mapping looks like:

<set name="newTransactions" inverse="true" lazy="true" cascade="save-update">
<key column="ACCOUNT_ID"/>
<one-to-many class="Transactions" />
</set>

In my child class (Transaction) mapping, here is what I have:

<many-to-one name="account"
class="Account"
column="ACCOUNT_ID"
not-null="true"/>

- If I create a new transaction, I have to go through the account object's business method. I create a new transaction object, set the parent to "Account" and add this transaction to the "Set" in the "Account". I also modify some properties in the "Account" object.

- I persist the parent object ("Account") and because of the "save-update" cascading, the new transaction is also inserted to the database.

Everything works fine. Except, when I add the new transaction to the "Set" in the Account, Hibernate initializes the collection and loads all past transactions. However, all I want to do is insert a new transaction. I don't want to retrieve past transactions.

Is it possible to define a cascading relationship from a parent to children and prevent Hibernate initialize the collection when I create new children instances? I want to define the parent-child relationship only between new children and the parent and I don't care about the existing children in the db.

I appreciate any help.

Thanks,
Mehmet

1. You could have a look at this:

http://www.hibernate.org/hib_docs/v3/re ... entinverse


2. If you just want to add new instances, you could also try this:

After the object is fetched do the following:

bankaccount.setNewTransactions(new HashSet()); // replace whatever hibernate has set with a new instance of the collection.

bankaccount.getNewTransactions().add(newTransaction);

or simply add your new transaction in a new Set and set it by calling
bankaccount.setNewTransactions.

Keep lazy=true for the 'newTransactions', which you already have.

Thanks, that link was useful and I'll replace set with a bag.

Thanks,
Mehmet