How to do a Multi field - Phrase search in Lucene?

Title asks it all... I want to do a multi field - phrase search in Lucene.. How t开发者_开发百科o do it ?

for example : I have fields as String s[] = {"title","author","content"};

I want to search harry potter across all fields.. How do I do it ?

Can someone please provide an example snippet ?

1. Use MultiFieldQueryParser, its a QueryParser which constructs queries to search multiple fields..

2. Other way is to use Create a BooleanQuery consisting of TermQurey (in your case phrase query).

3. Third way is to include the content of other fields into your default content field.

Generally speaking, querying on multiple fields isn’t the best practice for user-entered queries. More commonly, all words you want searched are indexed into a contents or keywords field by combining various fields.

Usage:

Query query = MultiFieldQueryParser.parse(Version.LUCENE_30, new String[] {"harry potter","harry potter","harry potter"},   new String[] {"title","author","content"},new SimpleAnalyzer());
IndexSearcher searcher = new IndexSearcher(...);
Hits hits = searcher.search(query);

The MultiFieldQueryParser will resolve the query in this way: (See javadoc)

Parses a query which searches on the fields specified. If x fields are specified, this effectively constructs:

(field1:query1) (field2:query2) (field3:query3)...(fieldx:queryx)

Hope this helps.

intensified googling revealed this :
http://lucene.472066.n3.nabble.com/Phrase-query-on-multiple-fields-td2292312.html.
Since it is latest and best, I'll go with his approach I guess.. Nevertheless, it might help someone who is looking for something like I am...

You need to use MultiFieldQueryParser with escaped string. I have tested it with Lucene 8.8.1 and it's working like magic.

String queryStr = "harry potter";
queryStr = "\"" + queryStr.trim() + "\"";
Query query = new MultiFieldQueryParser(new String[]{"title","author","content"}, new StandardAnalyzer()).parse(queryStr);
System.out.println(query);

It will print.

(title:"harry potter") (author:"harry potter") (content:"harry potter")