Howto call custom Oracel Data Type with TopLink?

Question

Hello,
in our DB we have a custom Oracle type and a PL/SQL method which uses it.
I would like to call the Oracle data type with TopLink. How can I do this?
I could not find any documentation on this.
I know JPublisher can do this but I don't want to use it!
Please see code below
cheers,
Pete
**************Datatype********************************
CREATE TYPE My_Sub_Object AS OBJECT (Sub_Object_ID Number,
Sub_Object_Txt VARCHAR2(200));
CREATE TYPE My_Sub_Objects AS VARRAY (20) OF My_Sub_Object;
CREATE TYPE My_object AS OBJECT (Object_id Number,
Object_txt VARCHAR2(200),
Sub_Objects My_Sub_Objects);
************PL/SQL-Method*****************************
CREATE OR REPLACE PROCEDURE My_object_pro
(Item_Object out My_Object) is
Item_Sub_Object My_Sub_Object;
Item_Sub_Objects My_Sub_Objects;
Begin
Item_Sub_Object := My_Sub_Object(10, 'Sub Object 10');
Item_Sub_Objects := My_Sub_Objects(Item_Sub_Object);
Item_Sub_Objects.Extend;
Item_Sub_Object := My_Sub_Object(11, 'Sub Object 11');
Item_Sub_Objects(2) := Item_Sub_Object;
Item_Object := My_Object(1, 'Object', Item_Sub_Objects);
End;
/

Answer 1

Object types and Varrays can be used from TopLink stored procedure calls. There was some support for this in 10.1.3, but the support in 11g (preview) is much better. You can also access the JDBC connection from TopLink or your DataSource and use JDBC directly.
In TopLink 11g you can use an ObjectRelationalDescriptor to map the Object type to a Java class, and use this class as the argument type in your StoredProcedureCall.
PL/SQL types are more difficult as they are not supported by JDBC, but your example only includes object types. If you had PL/SQL types you would need to wrap the types in object types, or use a PL/SQL block to convert them. TopLink 11g (preview 3) should have support for these as well.