Deleting Multiple Objects¶
This API deletes multiple objects in a data table with a single request. Consider the following example, it demonstrates an API call which deletes all objects in the Person
data table where the value of the age
property is greater than 20
:
Backendless.Data.of( "Person" ).remove( "age > 20", new AsyncCallback<Integer>()
{
@Override
public void handleResponse( Integer objectsDeleted )
{
Log.i( "MYAPP", "Server has deleted " + objectsDeleted + " objects" );
}
@Override
public void handleFault( BackendlessFault fault )
{
Log.e( "MYAPP", "Server reported an error - " + fault );
}
} );
Blocking API¶
public int Backendless.Data.of( "TABLE-NAME" ).remove(
String whereClause ) throws BackendlessException
public <E> int Backendless.Data.of( E ).remove(
String whereClause ) throws BackendlessException
Non-Blocking API¶
public void Backendless.Data.of( "TABLE-NAME" ).remove(
String whereClause,
AsyncCallback<Integer> responder )
public <E> void Backendless.Data.of( E ).update(
String whereClause,
AsyncCallback<Integer> responder )
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 to be deleted in the data table. |
responder |
a responder object which will receive a callback when the method successfully deleted the objects or if an error occurs. Applies to the non-blocking method only. |
Return Value¶
The method returns the number of objects deleted in the database.