Lucene.NET - 按 int 排序

发布于 2024-08-29 13:24:15 字数 431 浏览 2 评论 0原文

在最新版本的 Lucene（或 Lucene.NET）中，按排序顺序获取搜索结果的正确方法是什么？

我有一个这样的文档：

var document = new Lucene.Document();
document.AddField("Text", "foobar");
document.AddField("CreationDate", DateTime.Now.Ticks.ToString()); // store the date as an int

indexWriter.AddDocument(document);

现在我想要进行搜索并按最新的顺序获取结果。

如何执行按 CreationDate 对结果进行排序的搜索？ 我看到的所有文档均适用于使用现已弃用的 API 的旧 Lucene 版本。

原文

In the latest version of Lucene (or Lucene.NET), what is the proper way to get the search results back in sorted order?

I have a document like this:

var document = new Lucene.Document();
document.AddField("Text", "foobar");
document.AddField("CreationDate", DateTime.Now.Ticks.ToString()); // store the date as an int

indexWriter.AddDocument(document);

Now I want do a search and get my results back in order of most recent.

How can I do a search that orders results by CreationDate? All the documentation I see is for old Lucene versions that use now-deprecated APIs.

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春庭雪 2024-09-05 13:24:15

在做了一些研究并摸索 API 后，我终于找到了一些未弃用的 API（从 v2.9 和 v3.0 开始），它们允许您按日期排序：

// Find all docs whose .Text contains "hello", ordered by .CreationDate.
var query = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "Text", new StandardAnalyzer()).Parse("hello");
var indexDirectory = FSDirectory.Open(new DirectoryInfo("c:\\foo"));
var searcher = new IndexSearcher(indexDirectory, true);
try
{
   var sort = new Sort(new SortField("CreationDate", SortField.LONG));
   var filter =  new QueryWrapperFilter(query);
   var results = searcher.Search(query, , 1000, sort);
   foreach (var hit in results.scoreDocs)
   {
       Document document = searcher.Doc(hit.doc);
       Console.WriteLine("\tFound match: {0}", document.Get("Text"));
   }
}
finally
{
   searcher.Close();
}

注意，我正在对创建日期进行排序长比较。这是因为我将创建日期存储为 DateTime.Now.Ticks，它是一个 System.Int64，或者在 C# 中为 long。

After doing some research and poking around with the API, I've finally found some non-deprecated APIs (as of v2.9 and v3.0) that will allow you to order by date:

// Find all docs whose .Text contains "hello", ordered by .CreationDate.
var query = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "Text", new StandardAnalyzer()).Parse("hello");
var indexDirectory = FSDirectory.Open(new DirectoryInfo("c:\\foo"));
var searcher = new IndexSearcher(indexDirectory, true);
try
{
   var sort = new Sort(new SortField("CreationDate", SortField.LONG));
   var filter =  new QueryWrapperFilter(query);
   var results = searcher.Search(query, , 1000, sort);
   foreach (var hit in results.scoreDocs)
   {
       Document document = searcher.Doc(hit.doc);
       Console.WriteLine("\tFound match: {0}", document.Get("Text"));
   }
}
finally
{
   searcher.Close();
}

Note I'm sorting the creation date with the LONG comparison. That's because I store the creation date as DateTime.Now.Ticks, which is a System.Int64, or long in C#.

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