CODEWITHSUNDEEP
javalucenesearch-engine
Pedro Neves
Pedro Neves

Reputation: 374

Getting results of a search - lucene 4.4.0

I'm experiencing some problems on lucene. I'm querying a database. As far as i know the indexes are OK (i checked it with lukeall-4.4.0). the Query is constructed as following:

                Q = Query.split(" ");

                booleanQuery = new BooleanQuery();

                //Query[] Queryy = new Query[5 + 5 * Q.length];
                Query[] Queryy = new Query[3 + 3*Q.length];

                //USING THE ALL TEXT
                Queryy[0] = new TermQuery(new Term("DESIGNACAO", Query));
                Queryy[1] = new TermQuery(new Term("DESCRICAO", Query));
                Queryy[2] = new TermQuery(new Term("TAG", Query));

                //USING THE SEPARETED VALUES 
               for (int i = 3, j = 0; j < Q.length; i++, j++) {

                    Queryy[i] = new TermQuery(new Term("DESIGNACAO", Q[j]));
                    Queryy[++i] = new TermQuery(new Term("DESCRICAO", Q[j]));
                    Queryy[++i] = new TermQuery(new Term("TAG", Q[j]));

                }

                for (int i = 0; i < Queryy.length; i++) {
                    booleanQuery.add(Queryy[i], BooleanClause.Occur.MUST);
                }

The query is OK. For searching for "not or" the query (a booleanQuery) is going to be as following:

 +DESIGNACAO:not or  +DESCRICAO:not or  +TAG:not or  +DESIGNACAO:not +DESCRICAO:not +TAG:not +DESIGNACAO:or +DESCRICAO:or +TAG:or

I'm using SimpleAnalyser, thus the words not and or will not be removed. The problem is that i can't get hits. I can only have hits if i make a search with lukeall-4.4.0 but not with my code. My search method is the following one:

IndexReader reader = IndexReader.open(directory1);
        TopScoreDocCollector collector = TopScoreDocCollector.create(50, true);
        searcher = new IndexSearcher(reader);
        searcher.search(booleanQuery, collector);
        hits = collector.topDocs().scoreDocs;
        int total = collector.getTotalHits();
        displayResults();

Is there anything wrong in collecting the data or something??

Kind regards

Upvotes: 0

Views: 301

Answers (1)

Pedro Neves
Pedro Neves

Reputation: 374

Piece of cake. The problem was in the construction of the query:

for (int i = 0; i < Queryy.length; i++) {
    booleanQuery.add(Queryy[i], BooleanClause.Occur.MUST);
}

The BooleanClause.Occur.MUST means that this has to exist. Thus, all the terms i was adding to the booleanquery must exist (term1 AND term2 AND term3). The correct is:

booleanQuery.add(Queryy[i], BooleanClause.Occur.SHOULD);

This way I can say that has to exist one of those terms I have added (term1 OR term2 OR term3).

Kind regards

Upvotes: 2

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