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From Peter Carlson <carl...@bookandhammer.com>
Subject Re: Order by date
Date Tue, 03 Sep 2002 04:56:18 GMT
Phil,

Lucene returns results in the same order as they were added to the  
index. So if you want to sort by date, and only by date then add  
documents to your index in chronological order.

If you want to sort by more than one field, then one solution (and  
probably the fastest) is to get all terms of a given field and sort  
them along with their unique Lucene ID. Then, when you want to sort the  
subset of results, so the sort yourself based on the ID without using  
the index (using the index to get the values to sort will be much  
slower then getting all the values first and storing them). This was  
done in SearchBean in the contributions area if you want to see an  
example.

I hope this helps

--Peter


On Monday, September 2, 2002, at 01:32 PM, Philipp Chudinov wrote:

> Thank you, Terry. But I need to do it without additional classes or  
> smth.
> I just can not understand the problem... I've tried to reindex the  
> stuff
> with
>
> doc.add(Field.Keyword("_published", DateField.dateToString(date)));
>
> and to search with
>
>       Query query = new RangeQuery(null, new Term("_published",
> DateField.dateToString(new java.util.Date())), true);
>       DateFilter filter = DateFilter.Before("_published", new
> java.util.Date());
>       Hits hits = searcher.search(query, filter);
>
> maybe, I misunderstand how to use this filter? Does RangeQuery  
> automatically
> order results by field? Looks like it should... people in the  
> mailinglist
> says, that my first approach works well (when encoding date to string  
> with
> pattern(yyyyMMdd), but iam still lobotomized;(
> Phil.
>
> ----- Original Message -----
> From: "Terry Steichen" <terry@net-frame.com>
> To: "Lucene Users List" <lucene-user@jakarta.apache.org>
> Sent: Tuesday, September 03, 2002 1:16 AM
> Subject: Re: Order by date
>
>
>> Try Peter Carlson's SearchBean contribution.  Check the messages -  
>> there
> was
>> quite a bit of discussion on it.
>>
>> Regards,
>>
>> Terry
>>
>> ----- Original Message -----
>> From: "Philipp Chudinov" <morpheus@basko.ru>
>> To: "Lucene Users List" <lucene-user@jakarta.apache.org>
>> Sent: Monday, September 02, 2002 3:21 PM
>> Subject: Order by date
>>
>>
>>> Hi!
>>> How can I order search results by date? I just need to show n  
>>> documents,
>>> ordered by date (desc). I index documents with
>>>
>>> doc.add(Field.Keyword("_published", new
>>> SimpleDateFormat("yyyyMMddHHmmss").format(date)));
>>>
>>> , so it gives something like "20020619165800" in this field. Then I  
>>> use
>>> RangeQuery(null, currentdate(formatted the same way
>>> indexed("yyyyMMddHHmmss"), true). But results are not ordered  
>>> properly.
>>> Looks like this:
>>>
>>> 20020619165800
>>> 20020619165800
>>> 20020619165800
>>> 20020711170700
>>> 20020711170700
>>> 20020705131800
>>> 20020705131800
>>> 20020619165900
>>>
>>> So, how can I order them? Should I write some kind of "DateFilter"  
>>> (as
>>> suggested here
>>>
> http://www.mail-archive.com/lucene-user@jakarta.apache.org/ 
> msg01266.html)?
>>> If so, can't anybody explane me, how can I do this, since I feel  
>>> myself
> as
>> a
>>> lobotomized flatworm now:(
>>>
>>> Thanx.
>>>
>>>
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