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dan0
 Post subject: How to Include Hyphen in Hibernate Search Query?
PostPosted: Tue Apr 19, 2011 6:15 pm 
Newbie

Joined: Mon Oct 26, 2009 3:38 pm
Posts: 18
Does anyone know how to avoid queries being split on hyphens? My queries are being split on hyphens resulting in the following lucene query:
Quote:
+(topic:news -topic:international +topic:news -topic:domestic)

However, I want:
Quote:
+(topic:news - international topic:news - domestic)


To build the query I put together a convenience method (see below) using hibernate search 3.4.0.Final.
Code:
public org.apache.lucene.search.Query buildLuceneQuery(String[] queries, String[] fields, BooleanClause.Occur[] clauses) {
        try {                   
           org.apache.lucene.search.Query luceneQuery = MultiFieldQueryParser.parse(Version.LUCENE_31, queries, fields, clauses, new StandardAnalyzer(Version.LUCENE_31));
            LOGGER.debug("Parsed lucene search query: {}", luceneQuery.toString());
            return luceneQuery;
        } catch (Exception e) {
           LOGGER.error("Unable to parse lucene search query: {}", StringUtils.join(queries, ", "));
            throw new RuntimeException("Unable to parse multifield query", e);
        }
    }
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hardy.ferentschik
 Post subject: Re: How to Include Hyphen in Hibernate Search Query?
PostPosted: Wed Apr 20, 2011 4:16 am 
Hibernate Team
Hibernate Team

Joined: Thu Apr 05, 2007 5:52 am
Posts: 1689
Location: Sweden
There are several approaches to this problem, depending on your use-case. Are this user entered queries? If not and you are creating this queries programmatically in your code I would consider using the programmatic query API instead of using a query parser.

If you need the query parser you need to escape the '-', because it is alternative way to specify NOT terms. See also the Lucene query parser syntax - http://lucene.apache.org/java/3_1_0/que ... yntax.html

Last, but not least your search results will heavily depend on how your data is indexed. Is "news - international" indexed as two tokens "news" and "international" or is this maybe an un-tokenised field in which case you would have to use a phrase query to get a hit.

--Hardy
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dan0
 Post subject: Re: How to Include Hyphen in Hibernate Search Query?
PostPosted: Sat Apr 23, 2011 8:29 pm 
Newbie

Joined: Mon Oct 26, 2009 3:38 pm
Posts: 18
hardy.ferentschik wrote:
There are several approaches to this problem, depending on your use-case. Are this user entered queries? If not and you are creating this queries programmatically in your code I would consider using the programmatic query API instead of using a query parser.


The queries are user generated.

hardy.ferentschik wrote:
If you need the query parser you need to escape the '-', because it is alternative way to specify NOT terms. See also the Lucene query parser syntax - http://lucene.apache.org/java/3_1_0/que ... yntax.html


Since the queries are user generated, I'll have to scan and escape the "-"; do you have any suggestions on how best to do so?

hardy.ferentschik wrote:
Last, but not least your search results will heavily depend on how your data is indexed. Is "news - international" indexed as two tokens "news" and "international" or is this maybe an un-tokenised field in which case you would have to use a phrase query to get a hit.


The field is un-tokenised; so are you saying I need to ensure the user generated query is enclosed by double quotes before passing it to the multifield parser?

Thanks.

-Dan
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