Multi-Field Lucene Example
Storing and search more than one field is very easy to do in Lucene — This can make your lucene search engine much more powerful!
Tip: If you’re not already familiar with how to index and search single field documents, this is intended to build on our Simple Lucene Example.
Lucene Example Code: Multi-Field Documents
Create a Lucene document with more than one field
String content = "This is the example text I want to have Lucene index";
Document doc = new Document();
doc.add(Field.Keyword("keyword","Java"));
doc.add(Field.Text("title","My Document Title"));
doc.add(Field.Text("content",content));
You would then add the document to the index like normal.
Create a Lucene MultiFieldQueryParser
String fields[] = {"keyword","title","content"};
String queryString = "Java";
try {
Query query = MultiFieldQueryParser.parse(queryString,fields,new StandardAnalyzer());
} catch (ParseException e) {
System.out.println("Lucene ParseException: " + e. getMessage);
e.printStackTrace();
}
Read the additional fields from the returned hits
int hitCount = hits.length();
for(int i=0; (i < hitCount && i < 10); i++){
Document doc = hits.doc(i);
System.out.println(doc.get("keyword") + ", " + doc.get("title") + ", " + doc.get("content"));
}
That’s it!
That all you need to do to take the step to multi-field Lucene documents and searching from a single field.
Thanks you so much. It is really helpful article and I wanted this to search for an item that may exist multiple colums in a database. One improper approach here is, it requires to provide multiple or copy of keywords for all colums to be searched in it. Like this:
String fields[] = {”color”,”details”};
String keywords[] = {”white”,”white”};
This could have been made to provide single keyword over multiple fields, but unfortunately it is not possible. Anyway its ok and serves better
Thank you!
- Veeresh
Comment by Veeresh — May 13, 2009 @ 5:40 am