Unconditional Delivery Listeners¶
The where clause
argument in the addDeleteListener
method is optional. When it is not provided, the real-time database will deliver any object which is being deleted from the database's table:
EventHandler<Map> orderEventHandler = Backendless.data.of("Order").rt(); orderEventHandler.addDeleteListener((deletedOrder) { print("An Order object has been deleted. Object ID - ${deletedOrder['objectId']}"); });
EventHandler<Order> orderEventHandler = Backendless.data.withClass<Order>().rt(); orderEventHandler.addDeleteListener((deletedOrder) { print("An Order object has been deleted. Object ID - ${deletedOrder.objectId}"); });