some time ago i posted a list of my ideas along this.. http://groups.google.com/group/sqlalchemy/browse_thread/thread/d886963fe58d7abb > be ware: its all pure theory. > -1 (horizontal) (eager) loading ONLY of the needed row attributes, > also hierarhicaly (a.b.c.d) > -2 (vertical) simultanously loading of columns - e.g. the lazy > attribites - wholly, or in portions/slices (depending on UI > visibility or other slice-size) > -3 skipping creation of objects - only using the data, if time of > creation gets critical. For example a simple report for a > name.alias and age of person, the creation of 100,000 Persons can > be ommitted. To be able to do drill-down, the person.db_id would be > needed+stored too. > -4 cacheing of some aggregations/calculations in special > columns/tables, so they're not re-invented everytime > -5 translate the whole report - calculations, aggregations, > grouping etc. into sql and use the result as is (with same thing > about db_id's)
except the #4/aggregation which is pretty automated now, i dont have yet implementation of the rest. i think u're talking about #2 ? ciao svilen > Hey All, > > I have a conceptual question. > > You have two ways to get relations; lazy and nonlazy. Nonlazy works > great for saving queries but can get pretty slow with complicated > joins. So I was wondering if there was a third way; pre fetching > all the data for relations and let the mapper get the relation data > from a cache instead of doing another query. > > It's kinda hard to explain, so I wrote an example script at: > http://paste.pocoo.org/show/55145/ > > I guess this should be possible by writing some MapperExtension? > Did anyone do anything like this, or maybe has some pointers? > > Thanks! > > Koen > --~--~---------~--~----~------------~-------~--~----~ 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 [EMAIL PROTECTED] For more options, visit this group at http://groups.google.com/group/sqlalchemy?hl=en -~----------~----~----~----~------~----~------~--~---
