CODEWITHSUNDEEP
c#lucene.net
Thomas
Thomas

Reputation: 34188

How Lucene.net filter works

i got a piece of code to add filter with Lucene.net but good explanation was not there to understand the code. so here i paste the code for explanation.

List<SearchResults> Searchresults = new List<SearchResults>();

        string indexFileLocation = @"C:\o";
        Lucene.Net.Store.Directory dir =     Lucene.Net.Store.FSDirectory.GetDirectory(indexFileLocation);

        string[] searchfields = new string[] { "fname", "lname", "dob", "id"};
        IndexSearcher indexSearcher = new IndexSearcher(dir);

        Filter fil= new QueryWrapperFilter(new TermQuery( new Term(field, "5/12/1998")));
        var hits = indexSearcher.Search(QueryMaker(searchString, searchfields), fil);

        for (int i = 0; i < hits.Length(); i++)
        {
            SearchResults result = new SearchResults();
            result.fname = hits.Doc(i).GetField("fname").StringValue();
            result.lname = hits.Doc(i).GetField("lname").StringValue();
            result.dob = hits.Doc(i).GetField("dob").StringValue();
            result.id = hits.Doc(i).GetField("id").StringValue();
            Searchresults.Add(result);

        }

i need explanation for the below two line

    Filter fil= new QueryWrapperFilter(new TermQuery( new Term(field, "5/12/1998")));
    var hits = indexSearcher.Search(QueryMaker(searchString, searchfields), fil);

i just like to know first lucene search & pull all data and after implement filter or from the beginning lucene pull data based on filter? please guide. thanks.

Upvotes: 1

Views: 2768

Answers (1)

Bruno Costa
Bruno Costa

Reputation: 2720

i just like to know first lucene search & pull all data and after implement filter or from the beginning lucene pull data based on filter? please guide. thanks.

Lucene.Net will perform your search AND your filtered query and after it, it will "merge" the result. The reason to do it I believe is to cache the filtered query, because it will be more likely to have a hit on the next time than the search query.

Upvotes: 2

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