code: public static Sql newInstance(String url, String driverClassName) throws SQLException, ClassNotFoundException {
          loadDriver(driverClassName);
          return newInstance(url);
      }
docs: Creates a new Sql instance given a JDBC connection URL
  and a driver class name.
  
  @param url             a database url of the form
  <code>jdbc:<em>subprotocol</em>:<em>subname</em></code>
  @param driverClassName the fully qualified class name of the driver class
  @return a new Sql instance with a connection
  @throws SQLException           if a database access error occurs
  @throws ClassNotFoundException if the driver class cannot be found or loaded