[Pljava-dev] Passing custom java object to PL/Java

Hi!

I don't know, if I'm right, but try to serialize object Recurrence like
this:

CLIENT SIDE:
============
class Recurrence implements Serializable //...should be enough
{
...
}

Recurrence rec = ....;
ByteArrayOutputStream baos = new ...;
ObjectOutputStream oos = new ObjectOutputStream( baos );
oos.writeObject( rec );
oos.close();

byte[] value = baos.toByteArray();
statement.setBinaryStream( i++, new
ByteArrayInputStream(value),value.length); // Try use type BLOB!
// I don't know if this is most effective methond, how to pass BLOB
argument to JDBC statement...

SERVER SIDE:
============
....
Recurrence rec = (Recurrence)new ObjectInputStream( byteArrayInputStream
).readObject();

Try it and tell us if such method works!

If it throws SerializebleException, try to pass simpler argument like
string and so on.

Regards
Petr Michalek

Rakesh Vidyadharan wrote:
> Is it possible to pass custom Java objects to PL/Java (the reverse of
> passing from PL/Java to client programs? The error I get seems to
> indicate that the custom data type I defined in the deployment
> descriptor is not recognised when I do the setType on PGobject.
>
> I tried to do so as shown in the following files:
>
> http://www.rakeshv.org/tmp/test.java - wrapper program that does the
> JDBC invocation from client code.
>
> http://www.rakeshv.org/tmp/RecurrenceTest.java - The PL/Java utility class
>
> http://www.rakeshv.org/tmp/Recurrence.java - The custom data that is
> passed from client to server.
>
> http://www.rakeshv.org/tmp/DeploymentDescriptor.ddr - The deployment
> descriptor
>
> The following is the stack trace from the program:
>
> org.postgresql.util.PSQLException: Unknown type testType.
> at org.postgresql.jdbc2.AbstractJdbc2Statement.setPGobject
> (AbstractJdbc2Statement.java:1480)
> at org.postgresql.jdbc2.AbstractJdbc2Statement.setObject
> (AbstractJdbc2Statement.java:1616)
> at org.postgresql.jdbc3.AbstractJdbc3Statement.setObject
> (AbstractJdbc3Statement.java:1436)
> at org.postgresql.jdbc2.AbstractJdbc2Statement.setObject
> (AbstractJdbc2Statement.java:1627)
> at test.main(test.java:26)
>
> Rakesh
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>
>