Am Mittwoch, 13. April 2005 12:19 schrieb Pierre-Yves Delens: > Bonjour,
Guten Tag, > I'm developing my first ZODB app (without Zope). > I need to display sorted items from a BTree. > Sorting should happen by one of the fields value, not by key order. You can use "decorate sort undecorate". There are some examples in the python cookbook. > - Is IndexedCatalog the good solution ? You don't need indexedCatalog for sorting. If your whole btree fits into memory you can use it like a python dictionary. I looked at IndexedCatalog, but diceded to use may own Catalog which implements a small subset of the Index-API of Zope2. IndexedCatalog is more implicit than explicit. If I could do a rewrite of my app, I would have a look at the indexes of Zope3. Building simple indexes with btrees is not dificult: Just map the value of your object to the ID of your object: catalog.name["Pierre"]=.... # Every object has an integer ID in my app. Be sure to write unittests, which check that the (redundant) data of the catalog don't get out of sync. HTH, Thomas -- Thomas Güttler, TBZ-PARIV GmbH, Bernsdorfer Str. 210-212, 09126 Chemnitz Tel.: 0371/5221217 Fax: 0371/5221216 _______________________________________________ For more information about ZODB, see the ZODB Wiki: http://www.zope.org/Wikis/ZODB/ ZODB-Dev mailing list - ZODB-Dev@zope.org http://mail.zope.org/mailman/listinfo/zodb-dev
