SQL batch doesn't work; How to fetch related objects with fetch group?

Question

I have two questions:
1. SQL Batch doesn't seem to work. I have tested some batch object creation
with BatchLimit set to -1, 0, 1, 25, 100. They all have similar
performance.
kodo.jdbc.DBDictionary: BatchLimit=25
2. How to use custom fetch group to fetch related objects? The example of
custom fetch group only show how to fetch different attributes in different
groups. I have a test cases where I would like to pre-fetch related objects
to save round trip.
Enviroments:
* Kodo 3.1.0 RC1
* Oracle 9i release 1
Thanks for any help!
Qingshan Luo
Senior Software Engineer
Open Harbor
1123 Industrial Road
San Carlos, CA 94070
Phone: [phone]
Fax: [phone]

Answer 1

try poracle 10g driver. At least they fixed terrible CLOB bug may be batch
to. BTW 9.2.x has problem with batching with deferred constraints so be
careful
"Greg Campbell" <[email protected]> wrote in message
news:c3dmnu$rmj$[email protected]..
>
"Qingshan Luo" <[email protected]> wrote in message
news:c3dg7q$mdl$[email protected]..
Hi,
I have two technical questions with Kodo.
1. SQL Batch doesn't seem to work. I have tried batch size of -1, 0, 1,25.
But the performance from batch creating objects is not affected by batch
size.
kodo.jdbc.DBDictionary: BatchLimit=25You may be running into a bug in the Oracle 9.2 driver. That driverdoesn't
reliably give update counts when using batching and prepared statement
caching. By default, Kodo will turn off batching. You can manuallyenable
batching by setting the BatchLimit on your DBDictionary, as you've done.If
you do this, though, you may want to turn off prepared statement cachingby
setting MaxCachedStatements to 0 (see
http://www.solarmetric.com/Software/Documentation/3.1.0RC1/docs/ref_guide_dbsetup.html#ref_guide_dbsetup_builtin).
>
2. How to use custom fetch groups to eagerly fetch related persistable
objects? Example only showed attributes, not relationships.You can find information on setting up eager fetching of relations at
http://www.solarmetric.com/Software/Documentation/3.0.3/docs/ref_guide_
perfpack_eager.html
Basically, you'll need to add the relations to your fetch group, and
set the eager fetching mode.
Enviroment:
* Kodo 3.1.0 RC1
* Oracle 9i release 1.
Qingshan Luo
Senior Software Engineer
Open Harbor
1123 Industrial Road
San Carlos, CA 94070
Phone: [phone]
Fax: [phone]