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)
答案 0 :(得分: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