Zend_Db_Table_Abstract::_setupMetadata PHP Method

    protected function _setupMetadata()
    {
        if ($this->metadataCacheInClass() && count($this->_metadata) > 0) {
            return true;
        }
        // Assume that metadata will be loaded from cache
        $isMetadataFromCache = true;
        // If $this has no metadata cache but the class has a default metadata cache
        if (null === $this->_metadataCache && null !== self::$_defaultMetadataCache) {
            // Make $this use the default metadata cache of the class
            $this->_setMetadataCache(self::$_defaultMetadataCache);
        }
        // If $this has a metadata cache
        if (null !== $this->_metadataCache) {
            // Define the cache identifier where the metadata are saved
            //get db configuration
            $dbConfig = $this->_db->getConfig();
            $port = isset($dbConfig['options']['port']) ? ':' . $dbConfig['options']['port'] : (isset($dbConfig['port']) ? ':' . $dbConfig['port'] : null);
            $host = isset($dbConfig['options']['host']) ? ':' . $dbConfig['options']['host'] : (isset($dbConfig['host']) ? ':' . $dbConfig['host'] : null);
            // Define the cache identifier where the metadata are saved
            $cacheId = md5($port . $host . '/' . $dbConfig['dbname'] . ':' . $this->_schema . '.' . $this->_name);
        }
        // If $this has no metadata cache or metadata cache misses
        if (null === $this->_metadataCache || !($metadata = $this->_metadataCache->load($cacheId))) {
            // Metadata are not loaded from cache
            $isMetadataFromCache = false;
            // Fetch metadata from the adapter's describeTable() method
            $metadata = $this->_db->describeTable($this->_name, $this->_schema);
            // If $this has a metadata cache, then cache the metadata
            if (null !== $this->_metadataCache && !$this->_metadataCache->save($metadata, $cacheId)) {
                trigger_error('Failed saving metadata to metadataCache', E_USER_NOTICE);
            }
        }
        // Assign the metadata to $this
        $this->_metadata = $metadata;
        // Return whether the metadata were loaded from cache
        return $isMetadataFromCache;
    }

 protected function _setupMetadata()
 {
     //hier drinnen damits nur gemacht wird sobald di erste Table erstellt wird
     if (!self::getDefaultMetadataCache()) {
         $frontendOptions = array('automatic_serialization' => true, 'write_control' => false);
         if (extension_loaded('apc') && PHP_SAPI != 'cli') {
             $backendOptions = array();
             $backend = 'Apc';
         } else {
             $backendOptions = array('cache_dir' => 'cache/model', 'file_name_prefix' => 'dbtable');
             $backend = 'File';
         }
         $cache = Kwf_Cache::factory('Core', $backend, $frontendOptions, $backendOptions);
         self::setDefaultMetadataCache($cache);
     }
     parent::_setupMetadata();
 }