怎么在java中调用存储过程.

Question

            String sql = "{call insert_jh(?,?)}";
            String SearchResult = null;
            try {
                CallableStatement cstmt = conn.prepareCall(sql);
                cstmt.setString(1, "hello");
                cstmt.registerOutParameter(2, Types.VARCHAR);
                cstmt.executeUpdate();
                SearchResult = cstmt.getString(2);
                System.out.println(SearchResult);
            } catch (SQLException ex) {
                System.out.print("writeNote():" + ex.getMessage());
            }