Thanks for this example. I am uncertain about one detail: How do I achieve a
search for multiple keywords. Not just "green tree" but also "short road",
"sky", "bird"? Is there a chance to add those keywords to the "Query q =
qp.parse("\"green tree\"");" command?
Shai Erera wrote:
>
> How about using MultiFieldQueryParser. Here is a short main I wrote:
>
> Directory dir = new RAMDirectory();
> Analyzer analyzer = new StandardAnalyzer();
> IndexWriter writer = new IndexWriter(dir, analyzer);
> Document doc = new Document();
> doc.add(new Field("field1", "green tree", Store.NO,
> Index.TOKENIZED
> ));
> writer.addDocument(doc);
> doc = new Document();
> doc.add(new Field("field2", "green tree", Store.NO,
> Index.TOKENIZED
> ));
> writer.addDocument(doc);
> writer.close();
>
> IndexSearcher searcher = new IndexSearcher(dir);
> MultiFieldQueryParser qp = new MultiFieldQueryParser(new String[]
> {
> "field1", "field2" }, analyzer);
> Query q = qp.parse("\"green tree\"");
> if (q instanceof BooleanQuery /* Basically this should almost
> always
> be true */) {
> BooleanClause[] clauses = ((BooleanQuery) q).getClauses();
> for (int i = 0; i < clauses.length; i++) {
> clauses[i].setOccur(Occur.SHOULD); /* This is their
> setting
> by default though */
> }
> }
> Hits hits = searcher.search(q);
> System.out.println(hits.length()); /* Should print 2. */
> searcher.close();
>
>
> On Nov 22, 2007 3:26 PM, Erick Erickson <[EMAIL PROTECTED]> wrote:
>
>> The semantics of the phrase query you're constructing probably aren't
>> what you think. As best I can infer, you are trying to do something
>> like
>>
>> "green tree" in field1
>> or
>> "green tree" in field 2
>>
>> but that's not even close to what you're constructing.
>>
>> It would help a show what the query you want is in some form
>> like that above before trying to code it, because the actual
>> query you're making is something like asking for the phrase
>> "word1 in field1 word1 in field2 word2 in field1 word2 in field2"
>>
>> Actually, I can't render the semantics of what you're doing int English.
>> And Lucene can't parse it either.
>>
>> I suspect you want something like
>> PhraseQuery pq1
>> PhraseQuery pq2
>> for (String word : words) {
>> pq1.add(...);
>> pq2.add(...)
>> }
>> BooleanQuery bq().
>> bq.add(p1, .... SHOULD);
>> bq.add(p2, ... SHOULD);
>>
>> Index.search(bq);
>>
>> Best
>> Erick
>>
>> On Nov 22, 2007 7:17 AM, Rapthor <[EMAIL PROTECTED]> wrote:
>>
>> >
>> > There is no option to provide an Occur.SHOULD to the PhraseQuery. So
>> where
>> > does it go? I changed the source to look like this:
>> >
>> > PhraseQuery pq = new PhraseQuery();
>> > for (String word : words) {
>> > for (String field : fields) {
>> > pq.add(new Term(field, word));
>> > }
>> > }
>> > Hits hits = indexSearcher.search(pq);
>> >
>> > However, I get an exception:
>> > java.lang.IllegalArgumentException: All phrase terms must be in the
>> same
>> > field: description:green tree
>> >
>> > I don't understand how to a) search for combinations of words like
>> "green
>> > tree", b) search in multiple fields (description, text, ...) and c)
>> search
>> > by a SHOULD restriction.
>> > --
>> > View this message in context:
>> > http://www.nabble.com/AND-query-in-SHOULD-tf4855719.html#a13895700
>> > Sent from the Lucene - Java Users mailing list archive at Nabble.com.
>> >
>> >
>> > ---------------------------------------------------------------------
>> > To unsubscribe, e-mail: [EMAIL PROTECTED]
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>> >
>> >
>>
>
>
>
> --
> Regards,
>
> Shai Erera
>
>
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