On 23 Nov 2005, at 18:37, Alan Chandler wrote:
My home page wants to have a summary of perhaps the most recent
five blogs
entries.
Personifying your home page... cute :)
It looks as though I can use the Datefield class to store the
publication date
in an orderable form - so that I can effectively do a ordered
search using
this field as the sort field.
Is there anyway to limit the number of hits returned in the search
to 5 (or
does it not generate any storage overhead to return them all and
just use the
first 5)
I recommend against using DateField, because it's granularity is down
to the millisecond and has some nuances to it, but there are a few
options to doing what you want. Use a date field as YYYYMMDD format
instead (unless you need a time also).
1) Documents in Lucene are in order of insertion, so if you're
inserting them in chronological order, you could simply direct access
the last five documents without a search. 2) There is no (well,
minimal) storage overhead in doing a full search and only getting the
most recent 5 documents, provided you sort the search by the date
field. 3) There are expert-level search() methods that do allow
limiting to N number of results, but that isn't really necessary (see
javadocs for details - they literally are marked as "expert").
Erik
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