Martijn Faassen wrote at 2005-8-24 12:27 +0200:
>Underfeatured query API
>I do think that currently the API to query it is woefully underfeatured.
>I've tried to work on this problem and am sitting on some code that just
>needs a bit of time to polish and release that allows a simple query
>language on top of the catalog. It's just building up a tree of python
>objects for queries, nothing special, but it is a lot higher level than
>what's already there.
>Fast, easy batching/sorting
>I don't know how to do easy, efficient batching/sorting with the
>catalog. I'd like to be able to query *just* a batch of objects, sorted,
>for user interface purposes. There doesn't seem to be a straightforward
>way to do this yet, and this is a very common use case. The batching
>implementation sitting out there in zope.bugtracker.batching is nice,
>but doesn't deal with the catalog.
>I think this should be fixable with a bit more infrastructure though.
>Getting the right batch is just a query on an index, and the result can
>be sorted afterwards, though there are tricky issues getting the right
You may have a look at "AdvancedQuery"
It uses Python classes to contruct queries with "&" ("and"), "|" ("or")
and "~" ("not") out of elementary classes.
It solves the batching "problem" by means of lazy sorting.
This way, you can use any batching, the catalog does not need
to know about it.
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