Calling Stored Proc from JDBC

Question

Hi All,
I have a simple stored proc in SQL server 2000
CREATE PROCEDURE dbo.sp_myProc
AS
SELECT CategoryID,CategoryName from Categories
GO
My java code is
CallableStatement cs = connection.prepareCall("{? = call sp_myProc}");
cs.registerOutParameter(1, Types.VARCHAR);
boolean result = cs.execute();
System.out.println("Result : "+result);
ResultSet rs = (ResultSet)cs.getResultSet();
while(rs.next())
System.out.println(rs.getString("CategoryID"));
When I execute this, the stored procedure gets executed succesfully i.e, the Result is true.
But the resultset object : rs is Null. It returns a null pointer exception at rs.next();
The table has values & this returns proper values in SQL analyzer.
I use Microsoft JDBC drivers for SQL server.
Is there anything I am doing wrong, all examples i saw refered to the same thing. I am struck with this any help would be appreciated.
Thanks in advance,
Sudhindra

Answer 1

Sorry - small mistake here.
The number of ? marks in the () brackets = the number of parameters in the procedure.
Thus with your procedure nothing gets returned.
With an Oracle Db you will declare the proc as follows:
PROCEDURE abcd (par1 IN OUT VARCHAR2, par2 IN OUT VARCHAR2)
IS
BEGIN
SELECT abc, def INTO par1, par2 FROM xyz;
END;
Thus you will register two in String parameters AND two out String parameters.
If you require more than one record to be returned the you need to have a look at some collection type to be returned other than VARCHAR2.
Andre