code: public static DB open(String driver, String url, String user, String password) {
         return new DB(DB.DEFAULT_NAME).open(driver, url, user, password);
      }
docs: Opens a new connection based on JDBC properties and attaches it to a current thread.
  
  @param driver class name of driver
  @param url URL connection to DB
  @param user user name.
  @param password password.