isDbConnected() public static method

Check if database connection has been created
public static isDbConnected ( ) : boolean
return boolean
 /**
  * Handle getUpdates method
  *
  * @param int|null $limit
  * @param int|null $timeout
  *
  * @return \Longman\TelegramBot\Entities\ServerResponse
  */
 public function handleGetUpdates($limit = null, $timeout = null)
 {
     if (!DB::isDbConnected()) {
         return new Entities\ServerResponse(['ok' => false, 'description' => 'getUpdates needs MySQL connection!'], $this->bot_name);
     }
     //DB Query
     $last_update = DB::selectTelegramUpdate(1);
     //As explained in the telegram bot api documentation
     $offset = isset($last_update[0]['id']) ? $last_update[0]['id'] + 1 : null;
     $response = Request::getUpdates(['offset' => $offset, 'limit' => $limit, 'timeout' => $timeout]);
     if ($response->isOk()) {
         //Process all updates
         foreach ((array) $response->getResult() as $result) {
             $this->processUpdate($result);
         }
     }
     return $response;
 }
 public function preExecute()
 {
     if (!$this->need_mysql | $this->need_mysql & $this->telegram->isDbEnabled() & DB::isDbConnected()) {
         return $this->execute();
     }
     return $this->executeNoDB();
 }
 /**
  * Start a fake conversation for the passed command and return the randomly generated ids.
  *
  * @return array
  */
 public static function startFakeConversation()
 {
     if (!DB::isDbConnected()) {
         return false;
     }
     //Just get some random values.
     $message_id = mt_rand();
     $user_id = mt_rand();
     $chat_id = mt_rand();
     //Make sure we have a valid user and chat available.
     $message = self::getFakeMessageObject(['message_id' => $message_id], ['id' => $user_id], ['id' => $chat_id]);
     DB::insertMessageRequest($message);
     DB::insertUser($message->getFrom(), null, $message->getChat());
     return compact('message_id', 'user_id', 'chat_id');
 }