"There should be one-- and preferably only one --obvious way to do it." (The Zen of Python)
Shortcuts are nice, but they get me confused sometimes. On Mon, Nov 4, 2013 at 8:09 PM, Anthony <[email protected]> wrote: > On Monday, November 4, 2013 1:23:59 PM UTC-5, Annet wrote: >> >> Thanks for your reply. I had a look at the shortcuts in the book: >> >> http://web2py.com/books/default/chapter/29/06/#Shortcuts >> >> The first shortcut makes a significant difference in performance > > > The first shortcut is for a select. It says this: > > myrecord = db.mytable[id] > > is equivalent to: > > myrecord = db(db.mytable.id==id).select().first() > > > But in fact, it is really equivalent to this: > > myrecord = db(db.mytable.id==id).select(limitby=(0, 1), > orderby_on_limitby=False).first() > > > You shouldn't notice any performance difference in comparison to the latter. > >> so I thought maybe this: >> >> db.mytable[0] = dict(myfield='somevalue') >> >> an impact on performance too? > > > No, the above will not be any faster. If anything, it could be ever so > slightly slower because it requires a call to ._filter_fields(). > > Anthony > > -- > Resources: > - http://web2py.com > - http://web2py.com/book (Documentation) > - http://github.com/web2py/web2py (Source code) > - https://code.google.com/p/web2py/issues/list (Report Issues) > --- > You received this message because you are subscribed to the Google Groups > "web2py-users" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to [email protected]. > For more options, visit https://groups.google.com/groups/opt_out. -- Resources: - http://web2py.com - http://web2py.com/book (Documentation) - http://github.com/web2py/web2py (Source code) - https://code.google.com/p/web2py/issues/list (Report Issues) --- You received this message because you are subscribed to the Google Groups "web2py-users" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. For more options, visit https://groups.google.com/groups/opt_out.
