c# - Lucene.Net 创建空索引

Question

我在我的 asp .net mvc 应用程序中使用 Lucene.Net + SimpleLucene。从数据库创建索引时出现问题。索引似乎开始创建得很好，但我得到的只是 5 个大小为 0 和 1 KB 的文件:

_0.fdt             0KB  _0.fdx             0KB  segment.gen        1KB  segments_1         1KB  write.lock         0KB

I have such a model from which i want to create index:

public class Feed : BaseEntity
{

    public virtual string Address { get; set; }

    public virtual string Title { get; set; }

    public virtual string Description { get; set; }

    public virtual bool IsExported { get; set; }

    public virtual DateTime LastUpdateTime { get; set; }

    public virtual int UserId { get; set; }

    public virtual User User { get; set; }

    public virtual ICollection<FeedPost> Posts { get; set; }

    public virtual ICollection<Tag> Tags { get; set; }

    public virtual Filter Filter { get; set; }
}

我已经从 lucene 库中实现了两个必要的接口(interface):IIndexDefinition 和 IResultDefinition:

public class FeedIndexDefinition : IIndexDefinition<Feed>
{
    public Document Convert(Feed entity)
    {
        var document = new Document();
        document.Add(new Field("id", entity.Id.ToString(), Field.Store.YES, Field.Index.NOT_ANALYZED));
        document.Add(new Field("description", entity.Description, Field.Store.YES, Field.Index.ANALYZED));
        document.Add(new Field("title", entity.Title, Field.Store.YES, Field.Index.ANALYZED));
        return document;
    }

    public Term GetIndex(Feed entity)
    {
        return new Term("id", entity.Id.ToString());
    }
}


public class SearchResultDefinition : IResultDefinition<Feed>
{
    public Feed Convert(Document document)
    {
        Guid id = Guid.Parse(document.GetValue<String>("id"));
        var context = new UnitOfWork();
        Feed feed = context.FeedRepository.GetById(id);
        return feed;
    }
}

索引是这样执行的:

    private static readonly UnitOfWork Context = new UnitOfWork();
    public static void IndexAllFeeds()
    {
        var indexWriter = new DirectoryIndexWriter(new DirectoryInfo(IndexPath), true);
        var feeds = Context.FeedRepository.Get().AsEnumerable();
        var indexService = new IndexService(indexWriter);
        IEnumerable<Feed> array = feeds.ToList();
        indexService.IndexWriter.IndexOptions.OptimizeIndex = true;
        indexService.IndexEntities(array, new FeedIndexDefinition());
    }

这是创建查询以执行搜索的方法

public FeedQuery Search(string keywords)
    {
        if(!String.IsNullOrEmpty(keywords))
        {
            String[] fields = {"title", "description"};
            var parser = new MultiFieldQueryParser(
                Lucene.Net.Util.Version.LUCENE_29,
                fields,
                new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29));
            Query q = parser.Parse(keywords);
            this.AddQuery(q);
        }
        return this;
    }

最后是 Controller 中应该找到结果的方法

private static IEnumerable<Feed> SearchUserFeeds(string keywords)
    {
        keywords = "title5 description5 title4 description4 title3 description3";
        IEnumerable<Feed> searchResults;
        var indexSearcher = new DirectoryIndexSearcher(new DirectoryInfo(LuceneHelper.IndexPath));
        using (var searchService = new SearchService(indexSearcher))
        {
            var query = new FeedQuery().Search(keywords);
            searchResults = searchService.SearchIndex(query.Query, new SearchResultDefinition()).Results;
        }
        return searchResults;
    }

如果有人能够指出我的问题，我将不胜感激。

Answer 1

当您的 IndexWriter 未关闭或刷新时没关系。

如果这是关闭编写器后索引的凝视 - 尝试使用名为 lukeall 的第 3 方 java 工具检查索引