//Create row object
    $db = JFactory::getDBO();
    $row = new JObject();
    $row->id = (int)$user->id;
    $row->title = 'My Favorites';
    $row->alias = JFilterOutput::stringUrlSafe($row->title); //format in slashed alias format
    $row->default = 1;
     
    //third parameter is key field
    $ret = $db->updateObject('#__jxgallery_lightboxes', $row, 'id');
     
    if (!$ret) {
    $this->setError($db->getErrorMsg());
    return false;
    }

Updating Table Using JDatabase::updateObject() in Joomla

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