from java how to call a stored procedure passing an oracle cursor as an argument

I am using Java + iBatis and have a need to call an Oracle Stored Procedure that takes a cursor as an argument. Google didn't help me much in finding a code sample of how to call a stored procedure that accepts a cursor as an argument from java.

How can this be accomplished?

Scenario in steps:

 1. Java calls a Stored Proc passing primitives (varchar, char, etc) as
    parameters 
 2. Java retrieves the cursor returned from Step 1 
 3. Java calls a Stored Proc passing cursor from Step 2 as an argument  //how?

Solution

If those are really the only steps -- i.e. you aren't doing anything of importance in Java between the two calls -- then it makes more sense to me to avoid returning to Java at all.

If the first procedure were actually a function, you could simply do a single nested call:

BEGIN proc2(proc1(...)); END;

The cursor gets passed within Oracle and never needs to be handled by Java at all.

If your first procedure is a procedure that returns the cursor as an OUT parameter, you could write a wrapper function for it and do the same thing:

CREATE OR REPLACE FUNCTION func1(...)
  RETURN SYS_REFCURSOR
  AS
    foo SYS_REFCURSOR;
  BEGIN
    proc1(..., foo);
    RETURN foo;
  END func1;
/

Then BEGIN proc2(func1(...)); END; should work.

Now, if you really do need to go out to Java between the two calls, then I would try using OracleTypes.CURSOR when retrieving the output value from the first procedure, then simply pass that object into the second procedure. I don't know if this will work; if not, then there's probably no direct way to do it.