Question

我如何根据开始日期在lucene中实现评分和排序。

应在搜索结果中首先显示具有最新开始日期的事件。我正在使用lucene Version.LUCENE_44

我已从数据库中检索数据并将其存储在Lucene Document中，

public static Document createDoc(Event e) {
    Document d = new Document();
    //event id
    d.add(new StoredField("id", e.getId()));
    //event name
    d.add(new StoredField("eventname", e.getEName());
    TextField field = new TextField("enameSrch", e.getEName(), Store.NO);
    field.setBoost(10.0f);
    d.add(field);
    //event owner
    d.add(new StoredField("eventowner", e.getEOwner());
    //event start date
    d.add(new LongField("edateSort", Long.MAX_VALUE-e.getEStartTime(), Store.YES)); 
    //event tags    
    if (e.eventTags()!=null) {
        field = new TextField("eTagSrch", e.getTags(), Store.NO);
        field.setBoost(5.0f);
        d.add(field);
        d.add(new StoredField("eTags", e.getTags()));
    }

在搜索时我正在做，

public List search(String srchTxt){
        PhraseQuery enameQuery = new PhraseQuery();
        Term term = new Term("enameSrch", srchTxt.toLowerCase());
        enameQuery .add(term);

        PhraseQuery etagQuery = new PhraseQuery();
        term = new Term("eTagSrch", srchTxt.toLowerCase());
        etagQuery.add(term);

        BooleanQuery b= new BooleanQuery();
        b.add(enameQuery , Occur.SHOULD);
        b.add(etagQuery , Occur.SHOULD);

        SortField startField = new SortField("edateSort", Type.LONG);
        SortField scoreField = SortField.FIELD_SCORE;
        Sort sort = new Sort(scoreField, startField);

         TopFieldDocs tfd = searcher.search(b, 10, sort);
         ScoreDoc[] myscore= tfd.scoreDocs;

要改述：我想按日期对文档进行排序，在我的文档中存储为长字段（参见上面的代码）

Answer 1

您的代码所做的是按分数排序，然后按日期排序，因为您的分数不太可能相同，所以它们几乎总是按分数排序。

这就是我要做的事情：

Sort sorter = new Sort(); // new sort object

String field = "fieldName"; // enter the field to sort by
Type type = Type.Long; // since your field is long type
boolean descending = false; // ascending by default

SortField sortField = new SortField(field, type, descending);

sorter.setSort(sortField); // now set the sort field

这将按您指定的字段排序。你也可以这样做：

sorter.setSort(sortField, SortField.FIELD_SCORE); // this will sort by field, then by score

按日期排序lucene文档

1 个答案: