Object Updated Event Overview¶
When an object is updated in the Backendless Real-Time Database, it instantly notifies connected clients about the change using the
update event. Objects can be updated either using the Backendless Data API or in Backendless Console. A listener for the
update event can be notified about either updates of any object in the database or only those which match a pattern expressed as a where clause.
An event listener itself is an object which receives a callback when an event is triggered by the real-time database. To add an event listener, it is necessary to obtain a handler for a database table first. The handler provides methods for registering an event listener.
Backendless Database provides two APIs for object deletion: (1) single object deletion and (2) deletion in bulk. As a result, there are two different types of listeners which can be added to an event handler: Single Object Update Listener and Bulk Update Listener.