Updating Multiple Objects¶

This API updates multiple objects in a data table with a single request. Consider the following example, it demonstrates an API call which updates all objects in the Person data table where the value of the property age is greater than 20. As a result of the request, all updated objects will have the contactType property set to "personal":

Map changes = {"contactType": "personal"};
Backendless.data.of("Person").update("age > 20", changes).then((objectsUpdated) {
  print("Server has updated $objectsUpdated objects");
});

Method¶

Using Map

Future<int> Backendless.data.of("TABLE-NAME").update(String whereClause, Map changes);

Custom Class

Future<int> Backendless.data.withClass<E>().update(String whereClause, Map changes);

where:

Argument	Description
`TABLE-NAME`	Name of the table where the objects expressed via `java.util.Map` instances will be updated.
`E`	Java class of the data objects to update in the database.
`whereClause`	A condition for selecting objects in the data table which will be updated.
`changes`	An instance of `java.util.Map` containing the changes which will be applied to all objects in the data table which match the condition expressed via `whereClause`.

Return Value¶

The method returns the number of objects updated in the database.