Beautiful. I am impressed at the elegance of this sample and the others also.
pjjH On Apr 15, 3:26 pm, "Michael Bayer" <mike...@zzzcomputing.com> wrote: > for SQLA integration you'd probably build this into the Session/Query, > which is most easily accomplished by subclassing Query. some examples > are in the distribution in examples/query_caching. I use a variant of the > "with_cache_key" version for my own purposes. > > phrrn...@googlemail.com wrote: > > > Hi, > > I would like to export a 'lookup' interface to programmers that does > > object caching (a bounded size cache with a LRU replacement policy) > > and prefetching of small tables for read-only reference data. This is > > a rewrite in Python over SQL Alchemy of similar functionality in Perl > > (originally implemented over Class::DBI) > > > I would like to use some general purpose and configurable mechanism > > such as Shove : > >http://pypi.python.org/pypi/shove > > > for c in lookup(Country, [23, 45, 47, 48, 'CA', 'IE', 'FR']): > > print "%s %s" % (c.name, c.iso_code) > > > Ideally, the above code should cause an initialization of a cache for > > 'Country' objects followed by a prefetch of all countries (as the > > table is small). The lookup() function would return a list of the same > > cardinality as the input list where the elements of the return list > > are the corrosponding object ref or -- in the case that the element > > could not be found -- None. > > > I intend to use the session to retrieve the data, inflate the objects > > and so on. > > I am wondering where is a good place to put this kind of behavior in? > > a session or mapper extension? > > > In the meantime, I will implement the behavior I want 'outside' of SA > > and hope that I can eventually use a native SA mechanism. > > > thanks, > > pjjH > > --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "sqlalchemy" group. To post to this group, send email to sqlalchemy@googlegroups.com To unsubscribe from this group, send email to sqlalchemy+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
