How about using range query?
private Term begin, end;
begin = new Term("dateField",
DateTools.dateToString(Date.valueOf(<"backInTimeStringDate">)));
end = new Term("dateField",
DateTools.dateToString(Date.valueOf(<"farFutureStringDate">)));
RangeQuery query = new RangeQuery(begin, end, true);
IndexSearcher searcher = new IndexSearcher(directory);
Hits hits = searcher.search(query);
Document minDoc = hits.doc(0);
Document maxDoc = hits.doc(hits.length()-1);
String minDateString = minDoc.get("dateField");
String maxDateString = maxDoc.get("dateField");
That sould give you the min and max date fields.
Andrew
-----Original Message-----
From: Kevin Burton <[EMAIL PROTECTED]>
Sent: May 31, 2005 2:06 AM
To: java-user@lucene.apache.org
Subject: Finding minimum and maximum value of a field?
I have an index with a date field. I want to quickly find the minimum
and maximum values in the index.
Is there a quick way to do this? I looked at using TermInfos and
finding the first one but how to I find the last?
I also tried the new sort API and the performance was horrible :-/
Any ideas?
Kevin
--
Use Rojo (RSS/Atom aggregator)! - visit http://rojo.com.
See irc.freenode.net #rojo if you want to chat.
Rojo is Hiring! - http://www.rojonetworks.com/JobsAtRojo.html
Kevin A. Burton, Location - San Francisco, CA
AIM/YIM - sfburtonator, Web - http://peerfear.org/
GPG fingerprint: 5FB2 F3E2 760E 70A8 6174 D393 E84D 8D04 99F1 4412
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
---------------------------------------------------------------------
To unsubscribe, e-mail: [EMAIL PROTECTED]
For additional commands, e-mail: [EMAIL PROTECTED]
