我尝试使用 DateTools.dateToString()
方法来索引日期.它可以正常用于索引和搜索.
I tried it to index date with DateTools.dateToString()
method. Its working properly for indexing as well as searching.
但是我已经索引的数据有一些引用,它已经将 Date 索引为一个新的 Date().getTime()
.
But my already indexed data which has some references is in such a way that it has indexed Date as a new Date().getTime()
.
所以我的问题是如何对这些数据执行 RangeSearch Query
...
So my problem is how to perform RangeSearch Query
on this data...
有什么解决办法吗???
Any solution to this???
提前致谢.
您需要在日期字段上使用 TermRangeQuery
.该字段始终需要使用 DateTools.dateToString()
进行索引才能正常工作.下面是使用 Lucene 3.0 对日期范围进行索引和搜索的完整示例:
You need to use a TermRangeQuery
on your date field. That field always needs to be indexed with DateTools.dateToString()
for it to work properly. Here's a full example of indexing and searching on a date range with Lucene 3.0:
public class LuceneDateRange {
public static void main(String[] args) throws Exception {
// setup Lucene to use an in-memory index
Directory directory = new RAMDirectory();
Analyzer analyzer = new StandardAnalyzer(Version.LUCENE_30);
MaxFieldLength mlf = MaxFieldLength.UNLIMITED;
IndexWriter writer = new IndexWriter(directory, analyzer, true, mlf);
// use the current time as the base of dates for this example
long baseTime = System.currentTimeMillis();
// index 10 documents with 1 second between dates
for (int i = 0; i < 10; i++) {
Document doc = new Document();
String id = String.valueOf(i);
String date = buildDate(baseTime + i * 1000);
doc.add(new Field("id", id, Store.YES, Index.NOT_ANALYZED));
doc.add(new Field("date", date, Store.YES, Index.NOT_ANALYZED));
writer.addDocument(doc);
}
writer.close();
// search for documents from 5 to 8 seconds after base, inclusive
IndexSearcher searcher = new IndexSearcher(directory);
String lowerDate = buildDate(baseTime + 5000);
String upperDate = buildDate(baseTime + 8000);
boolean includeLower = true;
boolean includeUpper = true;
TermRangeQuery query = new TermRangeQuery("date",
lowerDate, upperDate, includeLower, includeUpper);
// display search results
TopDocs topDocs = searcher.search(query, 10);
for (ScoreDoc scoreDoc : topDocs.scoreDocs) {
Document doc = searcher.doc(scoreDoc.doc);
System.out.println(doc);
}
}
public static String buildDate(long time) {
return DateTools.dateToString(new Date(time), Resolution.SECOND);
}
}
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