Lucene的.NET搜索结果 [英] Lucene .NET search results

问题描述

我使用此代码指数：

public void IndexEmployees(IEnumerable<Employee> employees)
{
    var indexPath = GetIndexPath();
    var directory = FSDirectory.Open(indexPath);

    var indexWriter = new IndexWriter(directory, new StandardAnalyzer(Version.LUCENE_29), true, IndexWriter.MaxFieldLength.UNLIMITED);

    foreach (var employee in employees)
    {
        var document = new Document();
        document.Add(new Field("EmployeeId", employee.EmployeeId.ToString(), Field.Store.YES, Field.Index.NO, Field.TermVector.NO));
        document.Add(new Field("Name", employee.FirstName + " " + employee.LastName, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO));
        document.Add(new Field("OfficeName", employee.OfficeName, Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO));
        document.Add(new Field("CompetenceRatings", string.Join(" ", employee.CompetenceRatings.Select(cr => cr.Name)), Field.Store.YES, Field.Index.ANALYZED, Field.TermVector.NO));

        indexWriter.AddDocument(document);
    }

    indexWriter.Optimize();
    indexWriter.Close();

    var indexReader = IndexReader.Open(directory, true);
    var spell = new SpellChecker.Net.Search.Spell.SpellChecker(directory);
    spell.ClearIndex();

    spell.IndexDictionary(new LuceneDictionary(indexReader, "Name"));
    spell.IndexDictionary(new LuceneDictionary(indexReader, "OfficeName"));
    spell.IndexDictionary(new LuceneDictionary(indexReader, "CompetenceRatings"));
}

public DirectoryInfo GetIndexPath()
{
    return new DirectoryInfo(HttpContext.Current.Server.MapPath("/App_Data/EmployeeIndex/"));
}

和这段代码找到结果（以及建议）：

And this code to find results (as well as suggestions):

public SearchResult Search(DirectoryInfo indexPath, string[] searchFields, string searchQuery)
{
    var directory = FSDirectory.Open(indexPath);

    var standardAnalyzer = new StandardAnalyzer(Version.LUCENE_29);

    var indexReader = IndexReader.Open(directory, true);
    var indexSearcher = new IndexSearcher(indexReader);

    var parser = new MultiFieldQueryParser(Version.LUCENE_29, searchFields, standardAnalyzer);
    //parser.SetDefaultOperator(QueryParser.Operator.OR);
    var query = parser.Parse(searchQuery);

    var hits = indexSearcher.Search(query, null, 5000);

    return new SearchResult
                {
                    Suggestions = FindSuggestions(indexPath, searchQuery),
                    LuceneDocuments = hits
                        .scoreDocs
                        .Select(scoreDoc => indexSearcher.Doc(scoreDoc.doc))
                        .ToArray()
                };
}

public string[] FindSuggestions(DirectoryInfo indexPath, string searchQuery)
{
    var directory = FSDirectory.Open(indexPath);

    var spell = new SpellChecker.Net.Search.Spell.SpellChecker(directory);

    var similarWords = spell.SuggestSimilar(searchQuery, 20);

    return similarWords;
}

var searchResult = Search(GetIndexPath(), new[] { "Name", "OfficeName", "CompetenceRatings" }, "admin*");

简单查询：管理员或管理员*犯规给我任何结果。我知道，有一个与该名员工。我希望能够找到詹姆斯·詹姆森，如果我搜索詹姆斯。

Simple queries like: admin or admin* doesnt give me any results. I know that there is an employee with that name. I want to be able to find James Jameson if I search for James.

谢谢！

推荐答案

第一件事。你必须提交更改指数

First thing. You have to commit the changes to the index.

indexWriter.Optimize();
indexWriter.Commit(); //Add This
indexWriter.Close();

编辑＃2
此外，保持简单，直到你得到一些作品。

Edit#2 Also, keep it simple until you get something that works.

评论此东西出来。

//var indexReader = IndexReader.Open(directory, true);
//var spell = new SpellChecker.Net.Search.Spell.SpellChecker(directory);
//spell.ClearIndex();

//spell.IndexDictionary(new LuceneDictionary(indexReader, "Name"));
//spell.IndexDictionary(new LuceneDictionary(indexReader, "OfficeName"));
//spell.IndexDictionary(new LuceneDictionary(indexReader, "CompetenceRatings"));

编辑＃3

Edit#3

字段你正在搜索很可能不会经常改变。我将它们包括在搜索功能。

The fields you are searching are probably not going to change often. I would include them in your search function.

string[] fields = new string[] { "Name", "OfficeName", "CompetenceRatings" };

我认为这是一个字段是区分大小写的，有时你不会得到任何结果的最大原因那是因为你搜索名称字段（不存在），而不是名称字段。容易看出错误了这种方式。

The biggest reason I suggest this is that Fields are case-sensitive and sometimes you wont get any results and it's because you search the "name" field (which doesn't exist) instead of the "Name" field. Easier to spot the mistake this way.

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