Predis\Connection\NodeConnectionInterface::addConnectCommand PHP Method

    public function addConnectCommand(CommandInterface $command);

 /**
  * Prepares a connection instance after its initialization.
  *
  * @param NodeConnectionInterface $connection Connection instance.
  */
 protected function prepareConnection(NodeConnectionInterface $connection)
 {
     $parameters = $connection->getParameters();
     if (isset($parameters->password)) {
         $connection->addConnectCommand(new RawCommand(array('AUTH', $parameters->password)));
     }
     if (isset($parameters->database)) {
         $connection->addConnectCommand(new RawCommand(array('SELECT', $parameters->database)));
     }
 }