Question

对于一项要求，我必须存储多对多关系的信息。每个邮政编码都有N个courseIds，每个课程代码都有N个邮政编码。我将此信息存储在 Lucene 版本6.4 中。

private static void updateDoc(IndexWriter w, String id, String zipCode, String courseId) throws IOException {
        Term term = new Term("id", id);
        Document doc = new Document();
        doc.add(new StringField("id", id, Field.Store.YES));
        doc.add(new StringField("zipCode", zipCode, Field.Store.YES));
        doc.add(new StringField("courseName", courseId, Field.Store.YES));
        w.updateDocument(term, doc);

    }

public static void main(String[] args) throws Exception {

        File dataDir = new File("E:/local/data/");
        IndexWriter indexWriter = getIndexWriter(dataDir);

        //Zip Code
        for (int i = 0; i < 5; i++) {

            String zipCode = String.format("%05d", i);

            for (int j = 0; j < 10; j++) {

                String courseCode = "Course" + String.format("%03d", j);
                String id = getID();
                System.out.println(zipCode + "<---->" + courseCode);
                updateDoc(indexWriter, id, zipCode, courseCode);
            }
        }

        try {
            indexWriter.close();
        } catch (IOException e) {
            e.printStackTrace();
        }

    }

但问题是在搜索时，我没有获得针对邮政编码的课程ID的点击。

对于以下代码，我得到了正确的结果。

     String queryStr = "00003";//For zip code only
StandardAnalyzer analyzer = new StandardAnalyzer();
            Query q = new QueryParser("zipCode", analyzer).parse(queryStr);
            System.out.println(q.toString());

            IndexSearcher searcher = getIndexSearcher();
            TopDocs docs = searcher.search(q, 10);
            System.out.println("Total :::" + docs.totalHits);
            ScoreDoc[] hits = docs.scoreDocs;
            System.out.println("Found " + hits.length + " hits.");
            for (int i = 0; i < hits.length; ++i) {
                int docId = hits[i].doc;
                Document d = searcher.doc(docId);
                System.out.println((i + 1) + ". " + "---" + d.get("id") + " " + d.get("zipCode") + "\t" + d.get("courseName"));
            }

但是对于下面的代码，我没有得到结果，理想情况下它应该提供结果。我试图以与我为邮政编码类似的方式检索课程代码的结果。

    String queryStr = "Course005";//For course code only
StandardAnalyzer analyzer = new StandardAnalyzer();
            Query q = new QueryParser("courseName", analyzer).parse(queryStr);

            System.out.println(q.toString());

            IndexSearcher searcher = getIndexSearcher();
            TopDocs docs = searcher.search(q, 10);
            System.out.println("Total :::" + docs.totalHits);
            ScoreDoc[] hits = docs.scoreDocs;
            System.out.println("Found " + hits.length + " hits.");
            for (int i = 0; i < hits.length; ++i) {
                int docId = hits[i].doc;
                Document d = searcher.doc(docId);
                System.out.println((i + 1) + ". " + "---" + d.get("id") + " " + d.get("zipCode") + "\t" + d.get("courseName"));
            }

如果你查看上面两个代码片段，两者都是相同的，但字段名称是不同的。

请帮助我理解并让我知道它为什么不起作用。请通过仅传递查询字符串和字段名称来帮助如何实现结果。

为什么Lucene查询不能用于其他字段，如StringField类型

0 个答案: