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Subject: [Pljava-dev] Passing custom java object to PL/Java
Date: Mon, 17 Oct 2005 23:45:05 +0200
Message-ID: <43541B61.8040400@click.cz> (raw)
In-Reply-To: <1B4E0340-B59B-4152-B6AF-3862B5EF1845@rakeshv.org>
References: <1B4E0340-B59B-4152-B6AF-3862B5EF1845@rakeshv.org>

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
> _______________________________________________
> Pljava-dev mailing list
> Pljava-dev at gborg.postgresql.org
> http://gborg.postgresql.org/mailman/listinfo/pljava-dev
> 
> 
> 

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