owncloud / core

	 * @param int $operation 1 = add, 2 = modify, 3 = delete.

	 * @return void

	 */

	protected function addChange($calendarId, $objectUri, $operation) {

		$stmt = $this->db->prepare('INSERT INTO `*PREFIX*calendarchanges` (`uri`, `synctoken`, `calendarid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `*PREFIX*calendars` WHERE `id` = ?');

		$stmt->execute([

			$objectUri,

			$calendarId,

			$operation,

			$calendarId

		]);

		$stmt = $this->db->prepare('UPDATE `*PREFIX*calendars` SET `synctoken` = `synctoken` + 1 WHERE `id` = ?');

		$stmt->execute([

			$calendarId

		]);

	}

	/**

	 * Parses some information from calendar objects, used for optimized

	 * @param int $operation 1 = add, 2 = modify, 3 = delete

	 * @return void

	 */

	protected function addChange($addressBookId, $objectUri, $operation) {

		$sql = 'INSERT INTO `*PREFIX*addressbookchanges`(`uri`, `synctoken`, `addressbookid`, `operation`) SELECT ?, `synctoken`, ?, ? FROM `*PREFIX*addressbooks` WHERE `id` = ?';

		$stmt = $this->db->prepare($sql);

		$stmt->execute([

			$objectUri,

			$addressBookId,

			$operation,

			$addressBookId

		]);

		$stmt = $this->db->prepare('UPDATE `*PREFIX*addressbooks` SET `synctoken` = `synctoken` + 1 WHERE `id` = ?');

		$stmt->execute([

			$addressBookId

		]);

	}

	private function readBlob($cardData) {

		if (is_resource($cardData)) {