$comparams = JComponentHelper::getParams('#__extensions');
            $comparams->set('your_param', "dev.com");
            $componentid = JComponentHelper::getComponent('com_comonentname')->id;
            $table = JTable::getInstance('extension');
            $table->load($componentid);
            $table->bind(array('params' => $comparams->toString()));
            // check for error
            if (!$table->check()) {
                $this->setError('your_website_domain: check: ' . $table->getError());
                return false;
            }
            // Save to database
            if (!$table->store()) {
                $this->setError('your_website_domain: store: ' . $table->getError());
                return false;
            }