Fetch Mode for association RowIterators

Hello all,
In Jdev 3.2, I saw that a new "tuning" tab appeared in the view object wizard.
In the corresponding help pages we can read the following "If As needed is specified and too many row sets are open (and left open because they are not navigated to the end), the user may run out of result sets and get a DMLException exception (You can set the jbo.max.cursors runtime parameter to a higher number, if needed.)"
If I'm not mistaken, when 2 entities (e.g. dept, emp) are linked by a 1:n association, the entity on the 1 side of the 1:n association gets an accessor which returns a RowIterator.
for instance, in DeptImpl, I'll have a getEmp() accessor which returns a RowIterator containing EmpImpl entities, right?
So I'm just wondering what will be the fetch mode for this iterator.
The part about "...left open because they are not navigated to the end..." worries me a bit.
If these RowIterators use the "as needed mode",
how can I be sure that they are properly closed when I'm finished using them?
is there a RowIterator.close() method? (I haven't seen one)
Should I just navigate till the end of the RowSet?
I'm having quite a lot of Maximum open cursors exceeded exceptions on one of my programs, which makes extensive use of associations RowIterators, so I'm wondering if this could be the cause...
Thanks in advance for any help.
Remi

Ravi,
Great question. The iterators returned from association accessors use "Fetch as Needed" mode. So, if you are not exhausting the rows from an iterator (i.e. fetching all the rows) then the cursor will stay open.
In the 3.2.3 maintenance release, there is a new close() method on oracle.jbo.RowIterator so that you can prematurely close the cursor if you want.
In 3.2.2, unfortunately the only way to make sure the cursor gets closed is to fetch all the rows from the iterator.

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>
Bernd Speckmann wrote:
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i mean that
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Edited by: Ahmed.F on Nov 27, 2012 5:10 PM

my question
1- there is any way to assign the Fetch process to specific region so the process take all item in these region only.
2- how can create manual process to fetch row into specific items in page ( i tray these code
SELECT col1, col2, col3 ....
INTO :P1_ITEM1, :P1_ITEM, :P1_ITEM...
FROM table
WHERE id = :P_id ) but no data retrieve .
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<pre>
query = ...;
query.getFetchPlan().addGroup("relationshipGroup");
List<User> users = (List<User>) query.execute();
</pre>
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<pre>
query = ...;
((kodo.jdo.KodoFetchPlan) query.getFetchPlan()).addField("com.example.User.permissions");
List<User> users = (List<User>) query.execute();
</pre>
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<pre>
import org.apache.openjpa.persistence.OpenJPAQuery;
query = (OpenJPAQuery) ...;
query.getFetchPlan().addField("com.example.User.permissions");
List<User> users = (List<User>) query.getResultList();
</pre>
Note that in all cases, you could also make this change to the current PersistenceManager / EntityManager's fetch plan instead, to make the change happen for the duration of the use of that manager. In that environment, the change would need to happen before the query was created.
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http://screencast.com/t/m7lEYZ1m5F
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When you have a problem you'll get a faster, more effective response by including as much relevant information as possible upfront. This should include:
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