code: public Database get_db_obj(final String tango_host) throws DevFailed {
          final int i = tango_host.indexOf(":");
          if (i <= 0) {
              Except.throw_connection_failed("TangoApi_TANGO_HOST_NOT_SET",
                  "Cannot parse port number", "ApiUtil.get_db_obj()");
          }
          return get_db_obj(tango_host.substring(0, i), tango_host.substring(i + 1));
      }
docs: ===================================================================