我想根据一个字段获取最近的文章:pubdate。我现在有这种方法:
private void GetLastIndexId()
{
string indexLocation = @"C:\inetpubwwwrootMyWebsiteDataindexesnewsArticle";
Directory dir = FSDirectory.GetDirectory(indexLocation);
IndexReader indexReader = IndexReader.Open(dir);
IndexSearcher indexSearch = new IndexSearcher(indexReader);
Analyzer analyzer = new StandardAnalyzer();
QueryParser qp = new QueryParser("id", analyzer);
Query query = qp.Parse("pubdate: [2012-01-01T00:00:000-00:00 3012-01-01T00:00:000-00:00]");
Hits hits = indexSearch.Search(query);
List<Document> myHits = new List<Document>();
for (int i = 0; i < hits.Length(); i++)
{
if (i == hits.Length() - 1)
{
Document doc = hits.Doc(i);
lastPubDate = doc.GetValues("pubdate").First();
}
}
}
编辑:我这样做了,我从内容项目中获取长度-1项目。这是一种黑客攻击,因为如果文件夹结构发生变化,那么这可能会失败。
您是否尝试过接受排序参数的 IndexSearcher.Search 重载?
var sortField = new SortField("pubdate", SortField.STRING, /*reverse*/ true);
var hits = searcher.Search(query, /*filter*/ null, /*count*/ 1, new Sort(sortField));
我做了这样的事情:
var sortField = new SortField("pubdate", SortField.STRING, true);
for (int i = 0; i < hits.Length(); i++)
{
Document doc = hits.Doc(i);
string getDate = doc.GetValues("pubdate").First();
if (string.Compare(getDate, lastPubDate) > 0)
{
lastPubDate = doc.GetValues("pubdate").First();
}
}