I was just reading UserDict and thought how getitem, setitem, delitem could be added to db.Table for these:
person = db.person[person.id] -> shortcut syntax for db(db.person.id==person.id).select()[0] db.person[person.id] = db.person(age=lambda attrs: attrs.age+=1) -> update a record without having to fetch it first del db.person[person.id] -> delete a record without having to fetch it first There are more to be had: len(db.posts) -> count() for post in db.posts: post.update_record(...) Robin On Jan 22, 10:13 pm, mdipierro <[email protected]> wrote: > Could you elaborate on dictmixin? > > SQLStorage already extends a dict. Which methods do you think are > missing? > > Massimo > > On Jan 22, 9:03 pm, Robin B <[email protected]> wrote: > > > Simple queries could be generated from lists of filters, also simple > > queries require fewer ()'s: > > > db(*programmatic_filters).select() > > db(programmatic_filters).select() > > db(db.person.last_name=='Obama',db.person.first_name=='Barack').select > > () > > > vs > > > db((db.person.last_name=='Obama')& > > (db.person.first_name=='Barack')).select() > > > and > > > db(db.person.last_name=='Obama')(db.person.first_name=='Barack').select > > () > > > You have to iteratively build the query from the list, it would be > > easier to just pass in the list with or without a * (splat). > > > The real benefit is that drivers that do not allow "|" (GAE, MEMDB) > > could use trivial query parsers, which would make those drivers simple > > to write and maintain. > > > > > person = db.person(party='Republican') > > > > -> returns a person with default= values populated and **attrs set > > > > person.first_name = 'John' > > > > response.render(person=person) > > > > -> the record can be printed on a page without inserting it in db > > > > person.insert() > > > > -> actually inserts the record, returns 1 for success, 0 for failure, > > > > updates person attrs > > > > Not convinced about this one. > > > The benefit here is that you have easy access to all the default > > values without doing an insert, this become especially useful if > > db.Field(default=lamda:foo(123)) becomes possible. > > > > > person = db.person[person.id] > > > > -> shortcut syntax for db(db.person.id==person.id).select()[0] > > > > love this one > > > > > db.person[person.id] = db.person(age=lambda attrs: attrs.age+=1) > > > > -> update a record without having to fetch it first > > > > this depends on the one above I am not convinced about. One could do > > > db.person[person.id].update_record(age=...) > > > db.person[person.id].update_record(age=...) > > -> would require 2 db requests (select,update) > > > db.person[person.id] = db.person(age=...) > > -> would require 1 db request (update) > > > Since __setitem__(self,key,value) maps to self[key] = value, > > if implemented properly in the driver, > > this eliminates the redundant db request. > > > > > del db.person[person.id] > > > > -> delete a record without having to fetch it first > > > > love this one too > > > DictMixin could be used to implement a lot of functionality in the > > driver:http://svn.python.org/view/python/trunk/Lib/UserDict.py?view=markup > > > Robin --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "web2py Web Framework" 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 -~----------~----~----~----~------~----~------~--~---
