hi Snaky, Some apps are just not suitable for GAE such as when you need a C based library. But any simple web2py app should work on GAE too, with at most minor changes. Last year I tried running the wiki app on GAE and most of it worked out of the box.
A few things I needed to consider when developing for GAE: - may only use inequality filters (<, <=, >=, >, !=) on one property across all of its filters - the maximum 1000 records used to be a problem, but no longer - CPU is the only quota I have ever exhausted because inserting/ deleting records is expensive And a few problems that can be solved but then you are tied to GAE: - use blobstore API to store more than 1MB records - no string matching with LIKE but workaround using ngrams and: prop >= term AND prop < term + u"\ufffd" - each request can only last ~20 seconds (DeadlineExceededError) so you need to break heavy requests into small chunks with task queues Have a try uploading a simple app to GAE and I think you will be pleasantly surprised how well it works. Richard On Feb 23, 1:43 am, Snaky Love <[email protected]> wrote: > Hi, > > is there a how-to on what to avoid doing wrong when building a webapp > with web2py which should run on Google App Engine? I found, of course, > everything that is listed here: > > http://web2py.com/book/default/search?search=app+engine > > But I still do not feel very confident about which traps to avoid > stepping in... > > Of course I really, really would like to have the app also beeing able > to run not only on GAE but everywhere else - as I understand it now, a > simple change of the connection string will make it able to use, let´s > say mysql with a more "traditional" hosting environment? > > That would look like > > db = DAL('gae') > > to run on appengine and change to > > db = DAL('mysql://username:passw...@localhost/test', pool_size=0) > > to make it run anywhere else? > > [Of course, only if I do not use libs that are blacklisted on GAE] > > Or will the need for datastore-specific programming break my app for > other databases? > Certainly it will not be optimized for SQL-Engines, but still run? > > Sorry for too many questions :) > > Thanks you very much for your attention, > Snaky -- You received this message because you are subscribed to the Google Groups "web2py-users" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/web2py?hl=en.
