How to jump to specific page using Query Cursor?

Question

I am developing my website in python(webapp2) and google data store in back end. I have added query cursor for pagination and it\'s working good but it has only next and pre

Answer 1

You can't. Datastore doesn't know the number of results found by your query.

You can however use some tricks to simulate a full pagination. For example one technique is to generate a certain number of cursors in a loop and generating the "last page" one.

Like in the following pseudo-code:

(results, next_curs, more) = model.query....fetch_page(...)

for p in xrange(5):
    # generate cursor for page number 'b' 
    # by using the next_cursor from previous page
    (results, next_curs, more) = model.....fetch_page(cursor=next_cursor,...)

As you don't access the results cursor the performance is somewhat acceptable (depending on your models complexity, query complexity and such). You can tweak it on your data.