gistfile1.txt

        public function setFlagForOrder($incrementIds) {
             /**
             * Get Core Resource
             */
             $resource = Mage::getSingleton('core/resource');
             /**
             * Get Write Connection
             */
             $writeConnection = $resource->getConnection('core_write');

             $incrementIds = implode( ',', (array) $incrementIds );

             /**
             * Prepare Query
             */
             $query = "UPDATE sales_flat_order SET imported=1 WHERE increment_id IN ({$incrementIds}$
             /**
             * Execute the query
             */
             try {
                 $writeConnection->query($query);
                 return true;
             } catch (Mage_Core_Exception $e) {
                 $this->_fault('data_invalid', $e->getMessage());
             }

        }