Calling a procedure from drupal

I have a procedure structure like this in an Oracle database:

procedure overlapping_course (
  v_id  number,
  v_program varchar2,
  v_message_type  varchar2,
  v_user_type varchar2,
  v_language  varchar2, 
  v_channel varchar2,
  v_country varchar2,
  v_start_date  date,
  v_end_date  date,
 v_return_val  out varchar2
 )

I am trying to call this procedure from Drupal 7 and I am following this link. My code looks like this:

 $conn = Database::getConnection();
 $saved_class = $conn->getAttribute(PDO::ATTR_STATEMENT_CLASS);
 $conn->setAttribute(PDO::ATTR_STATEMENT_CLASS, array('PDOStatement')); 
 $statement = $conn->prepare('call overlapping_course(?,?,?,?,?,?,?,?,?,?)');    

$statement->bindParam(1, $id,PDO::PARAM_INT);

$id=1;

$statement->bindParam(1, $program,PDO::PARAM_STRING);

$program='c++';
 -------
 --------

but I am always getting the following error

Fatal error: Call to undefined method DatabaseStatementPrefetch::bindParam()   in C:Apache24htdocsdrupalincludesdatabaseoracledatabase.inc on line 655.