Lucene 3.0.3数字术语查询 [英] Lucene 3.0.3 Numeric term query

问题描述

我在Lucene 3.0.3中有一个数字字段，它可以很好地处理范围查询。如果我们切换到TermQuery，它不会产生任何结果。例如：

I have a numeric field in Lucene 3.0.3 and it works perfectly fine with the range queries. If we switch to the TermQuery it doesnt produce any result. For example:

    Document doc = new Document();
    String name = "geolongitude";
    NumericField numericField = new NumericField(name);
    double value = 29.0753505;
    String valueAsString = "29.0753505";
    numericField.setDoubleValue(value);
    doc.add(numericField);
    indexWriter.addDocument(doc);
    indexWriter.commit();
    indexWriter.close();
    IndexSearcher indexSearcher = new IndexSearcher(open);
    Query termQ = new TermQuery(new Term(name, valueAsString));
    TopDocs search = indexSearcher.search(termQ, 10);

在这种情况下，我得不到任何结果。我试图弄清楚是否存在任何NumericTermQuery但却无法找到。我可以做一些棘手的事情（对我正在搜索的术语进行范围查询）但我不喜欢这个解决方案。

In this case I dont get any result. I tried to figure out whether exist any "NumericTermQuery" but couldnt find that. I could do something tricky (make a range query for the term that I am searching) but I dont like the solution.

谢谢！

推荐答案

好的，我找到了不同的解决方案，

Ok, I have figure out a different solution,

String doubleToPrefixCoded = NumericUtils.doubleToPrefixCoded(value);
Query termQ = new TermQuery(new Term(name, doubleToPrefixCoded));

我发现它来自： http://www.gossamer-threads.com/lists/lucene/java-user/88516 并且它可以正常工作

I found it out from : http://www.gossamer-threads.com/lists/lucene/java-user/88516 and it works correctly

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