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 to 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 ?

Answer

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.

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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.

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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.