protected function connectToMySql($mySQLconfig)
    {
        if (is_null($this->mySQLconnection)) {
            extract($mySQLconfig);
            $this->mySQLconnection = new \mysqli($host, $username, $password, $database, $port);
            if ($this->mySQLconnection->connect_error) {
                $this->mySQLconnection = null;
                $erNo                  = $this->mySQLconnection->connect_errno;
                $erMsg                 = $this->mySQLconnection->connect_error;
                $msg                   = $this->lclMsgCmn('i18n_Feedback_ConnectionError');
                return sprintf($msg, $erNo, $erMsg, $host, $port, $username, $database);
            }
            return '';
        }
    }