Database Reference
In-Depth Information
Since we want to display pages of three, we should try to fetch more results before dis-
playing this page to the user. Knowing that we've reached the end of
bob
's partition, let's
see if we can find two more results in partitions that are situated after
bob
's:
SELECT * FROM "user_status_updates"
WHERE TOKEN("username") > TOKEN('bob')
LIMIT 2;
By asking for usernames whose partition token is greater than
bob
's token, we guarantee
that we get back results we haven't seen yet. The rows returned are the first two in
alice
's status updates:
Since we requested two rows and retrieved two rows, we know that there might be more
rows in
alice
's partition. Once again, we ask for
id
values greater than the last one that
we saw in
alice
's status updates:
SELECT * FROM "user_status_updates"
WHERE "username" = 'alice'
AND id > 3f9b5f00-e8f7-11e3-9211-5f98e903bf02
LIMIT 3;
The query returns two remaining status updates for
alice
:
Since we asked for three rows and only got back two, we know that we've now seen all
the status updates in
alice
's partition. Now, we should check if there are any more parti-
tions to iterate over; we'll just ask for one, since we already have the first two rows of this
page:
