Getting all items at once not possible

Android
1

Hey there,
we are using Version 3.0.11 of your Android SDK and have the following problem: We cannot fetch all items of one class by using the find method.
E.g. this code:

BackendlessDataQuery query = new BackendlessDataQuery();
QueryOptions options = new QueryOptions();
options.setSortBy(Arrays.asList("street"));
query.setQueryOptions(options);
BackendlessCollection<MyClass> result = Backendless.Persistence.of( MyClass.class ).find( query );

Results in this error: BackendlessException{ code: ‘Internal client exception’, message: ‘null’ }
However, using this code it works:

MyClass.findAsync(query, new AsyncCallback<BackendlessCollection<MyClass>>() {
@Override
public void handleResponse(BackendlessCollection< MyClass > response) {
 int size = response.getCurrentPage().size();
 if (size > 0) {
 elements.addAll(response.getData());
 response.nextPage(this);
 } else {
 EventBus.getDefault().post(new BackendlessCollectionEvent(response, elements));
 }
}
@Override
public void handleFault(BackendlessFault fault) {
 EventBus.getDefault().post(new BackendlessFaultEvent(fault));
}
});

Of course, since the paging needs multiple requests, it is slower than using a simple find. I am using this in a similar way on iOS and there it works just fine. Any hints?
Thanks a lot!
Best regards,
Martin

2

Hi Martin,
Do you use it on Android? If so, Android restricts long-running operations in main thread. That is why AsyncCallback is used.
Artur.

3

Hi Artur,

this is a good point, yes I am using Android. Okay then instead use this example:

Backendless.Persistence.of(MyClass.class).find(query, new AsyncCallback<BackendlessCollection<MyClass>>() {
    @Override
    public void handleResponse(BackendlessCollection< MyClass > response) {

        ArrayList<MyClass> arrayList = new ArrayList<>();
        arrayList.addAll(response.getData());

        EventBus.getDefault().post(new BackendlessCollectionEvent(response, arrayList));

    }

    @Override
    public void handleFault(BackendlessFault fault) {
        EventBus.getDefault().post(new BackendlessFaultEvent(fault));
    }
});

In this case paging is automatically enabled. Thus, this is not simply an async find. I still have to iterate over the pages. Can I somehow turn paging off here or is it mandatory when using Android in contrast to the iOS implementation?

Thank you!
Best,
Martin

4

The paging cannot be turned off. We’re planning to increase the max page size value, but for now it’s 100.