如何在 Lucene 中进行多字段 - 短语搜索？

Question

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

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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Add

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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Update

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.

Answer 2

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...

Answer 3

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")