Ruckusing_Adapter_MySQL_TableDefinition::keys PHP Method

    private function keys()
    {
        if (count($this->_primary_keys) > 0) {
            $lead = ' PRIMARY KEY (';
            $quoted = array();
            foreach ($this->_primary_keys as $key) {
                $quoted[] = sprintf("%s", $this->_adapter->identifier($key));
            }
            $primary_key_sql = ",\n" . $lead . implode(",", $quoted) . ")";
            return $primary_key_sql;
        } else {
            return '';
        }
    }