VC 7.0 Oracle stored procedures resultset with ref cursor

Question

Can VC (we are on NW7 SP13) handle Oracle's datatype ref cursor - which is the standard solution in Oracle to return result sets - as the return value of a stored procedure?
When testing a data service in the VC story board based upon a simple Oracle function like:
create or replace package pkg_dev
is
   type t_cursor is ref cursor;
end;
create or replace function vc_stub return pkg_dev.t_cursor
as
l_cursor pkg_dev.t_cursor;
begin
open l_cursor for select ename from emp;
return l_cursor;
end;
(just as example - I know that could be easily retrieved using the BI JDBC connector framework and accessing tables / views)
I am always running in the "portal request failed ( Could not execute Stored Procedure)" error - so I am not able to use the "add fields" function to bind the output.
The defaulttrace contains entries like:
Text: com.sap.portal.vc.HTMLBRunTime
[EXCEPTION]
com.sapportals.connector.execution.ExecutionException: Could not execute stored procedure
Caused by: java.sql.SQLException: Invalid column type
     at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
We deployed Oracle's own jdbc-driver for Oracle 10g. Using that driver and a portal jdbc connector framework entry the stored procedures of the Oracle database user mapped to the portal user are discovered and available in the "Find Data Services" section.

Answer 1

We deployed the drivers as described in the HowTo Papers (e.g.Hwo to Configure UD Connect on the J2EE Server for JDBC Access to External Databases). When deploying the drivers you assign a freely definable name for the set of Oracle's jar-files (eg. oracle_10) as library name. Having deployed the drivers in that way only System Definitions via BI JDBC connector framework were working. With a little help from SAP Support (call lasted more than 2 months till a very capable member of the support team made things working in a very short time) we got the portal jdbc connection with Oracle's jar-files working:
Here are instructions how to add reference:
1. Connect to the j2ee using telnet, e.g in the cmd window type:
telnet <host> <port> + 8, enter uid and pwd of j2ee admin.
2. jump 0
3. add deploy
4. change_ref -m com.sapportals.connectors.database <your lib name>       <your lib name = oracle_10>
Trying to manually add this reference in visual admin connector container for JDBCFactory failed - reference could be added and saved, but then disappeared (at least in NW7 with SP12). Adding the reference as described above solved the problem.