Sync object retrieval on Backendless 4.0

iOS
1

I need to retrieve objects synchronously using Backendless 4.0. How can I prepare the Data Query Builder next page synchronously using iOS SDK?

2

Did you see the doc on data paging?

3

Yes, I saw it, but I didn’t find out how to access next page using the sync method.

4

The nextPage method simply recalculates the offset. You would need to use the find method to fetch data.

5

Please, check this:

-(void)paging:(DataQueryBuilder *)queryBuilder {
    NSArray *people = [[backendless.data of:[Person class]] find:queryBuilder];
    if (people.count != 0) {
        NSLog(@"Loaded %d people in the current page", (int)people.count);
        for (Person *person in people) {
            NSLog(@"%@, age %i", person.name, (int)person.age);
        }
        [self paging:[queryBuilder prepareNextPage]];
    }
    else {
        NSLog(@"Reached the end of collection");
    }
}

Regards, Olga

6

Well, but now it obligates us to increase the number of requisitions to the database once I need to use a recursive method.

7

Whether you use the sync approach or the async one, the number of database requests would be the same.

8

Yes, but it will be greater than the Backendless 3.0 API

9

This is not right. The prepareNextPage method is not an API call, it merely does the following:

offset += pageSize;