问题描述

我正在使用 Lucene.net 来尝试了解如何在我的应用程序中实现它.

I am playing around with Lucene.net to try and get a handle of how to implement it in my application.

我有以下代码

            .....
            // Add 2 documents
            var doc1 = new Document();
            var doc2 = new Document();

            doc1.Add(new Field("id", "doc1", Field.Store.YES, Field.Index.ANALYZED));
            doc1.Add(new Field("content", "This is my first document", Field.Store.YES, Field.Index.ANALYZED));
            doc2.Add(new Field("id", "doc2", Field.Store.YES, Field.Index.ANALYZED));
            doc2.Add(new Field("content", "The big red fox jumped", Field.Store.YES, Field.Index.ANALYZED));

            writer.AddDocument(doc1);
            writer.AddDocument(doc2);

            writer.Optimize();
            writer.Close();

            // Search for doc2
            var parser = new QueryParser(Lucene.Net.Util.Version.LUCENE_29, "content", new StandardAnalyzer(Lucene.Net.Util.Version.LUCENE_29));
            var query = parser.Parse("big abcdefg test1234");
            var searcher = new IndexSearcher(indexDirectory, true);
            var hits = searcher.Search(query);

            Assert.AreEqual(1, hits.Length());

            var document = hits.Doc(0);

            Assert.AreEqual("doc2", document.Get("id"));
            Assert.AreEqual("The big red fox jumped", document.Get("content"));

这个测试通过了，这让我有点沮丧.我认为这意味着 Lucene.Net 使用 OR 来搜索术语而不是 AND，但我找不到任何有关如何实际执行 AND 搜索的信息.

This test passes, which dismays me a bit. I assume this means that Lucene.Net uses OR for searches between terms and not an AND, but I can't find any information on how to actually perform an AND search.

我想要的最终结果是，如果有人搜索Matthew Anderson"，我不希望它显示引用Matthew Doe"的文档，因为这与任何方式、形状或形式都不相关.

The end result I am going for is if someone searches for "Matthew Anderson" I don't want it to bring up documents that refer to "Matthew Doe" , as that isn't relevant in any way, shape or form.

推荐答案

A.如果您要求所有单词都在文档中，但不要求单词是连续的并且按照您指定的顺序:查询

A. If you require all words to be in a document but don't require the words to be consecutive and in the order you specify: The query

+big +red

匹配

* the big red fox jumped
* the red big fox jumped
* the big fast red fox jumped

但不匹配

* the small red fox jumped

B.如果你想匹配一个短语(即所有单词都需要；单词必须是连续的并且按照指定的顺序):查询

B. If you want to match a phrase (i.e. all words required; the words have to be consecutive and in the order specified) instead: The query

+"big red"

匹配

* the big red fox jumped

但不匹配

* the red big fox jumped
* the big fast red fox jumped
* the small red fox jumped

这篇关于当搜索中使用多个单词时，如何在 Lucene.net 中执行 AND 搜索?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持编程学习网！