访问Oracle SYS_REFCURSOR

Question

I'm kinda stuck here. I have a small stupid function in Oracle and try to access it with Java. The return value should be an SYS_REFCURSOR. But I get an error if I try to call it in Java.

This is the Oracle function:

FUNCTION GET_TBL_AS_CUR
RETURN SYS_REFCURSOR
IS
  Tbl SYS_REFCURSOR;
BEGIN

  OPEN Tbl FOR SELECT * FROM test_tbl;
  RETURN Tbl;

END;

This is the Call in Java:

String stmt = "callStmt: {?= call dbschema.pkg_tbl_tools.get_tbl_as_cur()}";
callableStatement = conn.prepareCall(stmt);
callableStatement.registerOutParameter(1, OracleTypes.CURSOR);
System.out.println("Executing... " + stmt + "\n");

callableStatement.execute();

rs = ((OracleCallableStatement)callableStatement).getCursor(1);

} catch (Exception e) {
    System.out.println(e.getMessage());
}

The error message is:

Unknown SQL-Type: sqlKind = UNINITIALIZED

What am I doing wrong??

Answer 1

Issue resolved.

Thanks for your help. To summarize the final "trick" I'll post here the solution.

This style of call will work for any function or procedure in Oracle IF the function will return not an collection as ref cursor.

String stmt = "{call ? := dbschema.pkg_tbl_tools.get_tbl_as_cur()}";

This style works in Oracle just fine, even if the return value is a ref cursor

String stmt = "BEGIN ? := dbschema.pkg_tbl_tools.get_tbl_as_cur(); END;";

The following line

rs = ((OracleCallableStatement)callableStatement).getCursor(1);

could be changed into

rs = (ResultSet) callableStatement.getObject(1);

Don't know why. But it works now. Thanks again :)