function _performUpgrade()
{
$this->_deleteSmartyFiles();
$this->_deleteProxyFiles();
require_once KT_LIB_DIR . '/cache/cache.inc.php';
$oCache =& KTCache::getSingleton();
$oCache->deleteAllCaches();
require_once KT_LIB_DIR . '/permissions/permissionutil.inc.php';
$po =& new KTRebuildPermissionObserver($this);
$po->start();
$oChannel =& KTPermissionChannel::getSingleton();
$oChannel->addObserver($po);
set_time_limit(0);
ignore_user_abort(true);
KTPermissionUtil::rebuildPermissionLookups(true);
$po->end();
$versionFile = KT_DIR . '/docs/VERSION-NAME.txt';
$fp = fopen($versionFile, 'rt');
$systemVersion = fread($fp, filesize($versionFile));
fclose($fp);
$query = "UPDATE system_settings SET value = ? WHERE name = ?";
$aParams = array($systemVersion, "knowledgetreeVersion");
DBUtil::runQuery(array($query, $aParams));
$query = "UPDATE system_settings SET value = ? WHERE name = ?";
$aParams = array($this->version, "databaseVersion");
return DBUtil::runQuery(array($query, $aParams));
}
