TopLink support for JDO?

Hi,
I'm new to TopLink and am wondering what the status of JDO support is in 4.6. I can see that there is a JDO example, and that the RELNOTES indicate JDO support. But the level of spec compliance and JDO specific tools in TopLink are not documented AFAIK.

I finally found the javadocs in the TopLink 4.6 distribution. From these, plus from the examples, it seems to me that the TopLink JDO 1.0 support is partial.
They do provide partial implementations to most of the JDO interfaces in javax.jdo package. The one exception is javax.jdo.InstanceCallbacks. What I mean by partial is that some required methods are no-ops (no operation). No-ops do nothing and return null or zero depending on their return type.
They don't support the JDO query language. You can use their implementation of javax.jdo.Query to create a query using SQL, TopLink query language, or EJBQL.
They don't support the enhancer. The enhancer is controversial, therefore some people see this as a good thing.
I ran a little program to display the results of PersistenceManagerFactory.supportedOptions() for TopLink.
SUPPORTED OPTIONS
javax.jdo.option.NontransactionalRead
javax.jdo.option.ArrayList
javax.jdo.option.HashMap
javax.jdo.option.Hashtable
javax.jdo.option.LinkedList
javax.jdo.option.ArrayList
javax.jdo.option.TreeMap
javax.jdo.option.TreeSet
javax.jdo.option.Vector
javax.jdo.option.Map
javax.jdo.option.List
javax.jdo.option.Array
UNSUPPORTED OPTIONS
javax.jdo.query.JDOQL
javax.jdo.option.RestoreValues
javax.jdo.option.NullCollection
javax.jdo.option.NontransactionalWrite
javax.jdo.option.TransientTransactional
javax.jdo.option.RetainValues
javax.jdo.option.NonDatastoreIdentity
javax.jdo.option.Optimistic
javax.jdo.option.DatastoreIdentity
javax.jdo.option.ApplicationIdentity
I'm not sure why the javax.jdo.query.JDOQL option even exists. As I understand it support for the JDOQL is mandatory, not optional. But maybe this is a versioning thing. That is, maybe JDO 2.0 will allow implementations to provide JDOQL 1.0 and/or JDOQL 2.0. Just a guess.
Hope this helps.

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Message was edited by:
Bart Kummel

Hi all,
I'm trying to subclass <tt>DatabasePlatform</tt> to add pagination support for the AS/400 DB2 database of my customer. To be fair, it is not going very well so far.
The first problem is, the query Chris found by googling (Re: Pagination support for non-Oracle databases?), does not work for AS/400s version of DB2. In fact, although it is called "DB2", the database on the AS/400 system is a whole other database than the "normal" DB2 database that runs on Windows and *nix. The AS/400 DB2 simply does not have a "ROW_NEXT" function.
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import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
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import org.eclipse.persistence.internal.databaseaccess.DatabaseCall;
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}(As you can see, I had to override the <tt>wasFailureCommunicationBased()</tt> method as well, due to some unexpected NPE's. (A bug, perhaps?))
This code does work. However, the performance is not very well. The first page comes relatively fast, but as you browse further in the table, each page comes slower. I assume this is because the counter() method has to be evaluated for each row in the table.
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Best regards,
Bart Kummel

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