nextcloud / calendar

		}

	}

	//deletes all confirmations where otoLayerId = $otoLayerId

	public function deleteConfirmationsByOtoLayer($otoLayerId){

		$sql = 'DELETE FROM `*PREFIX*calendar_oto_confirmations` WHERE `oto_layer_id` = ?';

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

		$stmt->bindParam(1,$otoLayerId, \PDO::PARAM_INT);

		$stmt -> execute();

	}

	//deletes all confirmations with the given sourceId

	public function deleteBySourceId($sourceId,$userId){

		$sql = 'DELETE `t1` FROM `*PREFIX*calendar_oto_confirmations` AS `t1` ' .

		}

	}

	//deletes all layers where otoLayerId = $otoLayerId

	public function deleteLayer($otoLayerId){

		$sql = 'DELETE FROM `*PREFIX*calendar_oto_layers` WHERE `oto_layer_id` = ?';

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

		$stmt->bindParam(1,$otoLayerId, \PDO::PARAM_INT);

		$stmt -> execute();

	}

	//checks if a calendar layer is being used for scheduling

	public function isOtoLayer($sourceId){

		$sql = 'SELECT COUNT(*) AS `count` FROM `*PREFIX*calendar_oto_layers` ' .