public static void OptimizeLuceneIndex()
{
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = SearcherBase.GetAnalyzer();
using (var writer = new IndexWriter(SearcherBase.Directory, analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
analyzer.Close();
writer.Optimize();
}
}
/// <summary>
/// 按id清楚
/// </summary>
/// <param name="recordId"></param>
public static void ClearLuceneIndexRecord(int recordId)
{
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = SearcherBase.GetAnalyzer();
using (var writer = new IndexWriter(SearcherBase.Directory, analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
var searchQuery = new TermQuery(new Term("Id", recordId.ToString()));
writer.DeleteDocuments(searchQuery);
analyzer.Close();
}
}
public static void UpdateLuceneIndex(IEnumerable <Article> data)
{
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = SearcherBase.GetAnalyzer();
using (var writer = new IndexWriter(SearcherBase.Directory, analyzer, IndexWriter.MaxFieldLength.UNLIMITED))
{
// replaces older entry if any
foreach (var sd in data)
{
AddToLuceneIndex(sd, writer);
}
analyzer.Close();
}
}
/// <summary>
/// 清楚全部
/// </summary>
/// <returns></returns>
public static bool ClearLuceneIndex()
{
try
{
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = SearcherBase.GetAnalyzer();
using (var writer = new IndexWriter(SearcherBase.Directory, analyzer, true, IndexWriter.MaxFieldLength.UNLIMITED))
{
writer.DeleteAll();
analyzer.Close();
}
}
catch (Exception e)
{
return(false);
}
return(true);
}
private static IEnumerable <Article> SearchQuery(string searchQuery, int pageIndex, int pageSize, string searchField = "")
{
if (string.IsNullOrEmpty(searchQuery.Replace("*", "").Replace("?", "")))
{
return(new List <Article>());
}
using (var searcher = new IndexSearcher(SearcherBase.Directory, false))
{
var hitsLimit = 1000;
//var analyzer = new StandardAnalyzer(Version.LUCENE_30);
var analyzer = SearcherBase.GetAnalyzer();
if (!string.IsNullOrEmpty(searchField))
{
var parser = new QueryParser(Version.LUCENE_30, searchField, analyzer);
var query = ParseQuery(searchQuery, parser);
var hits = searcher.Search(query, hitsLimit).ScoreDocs;
hits = hits.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToArray();
var results = MapLuceneToDataList(hits, searcher);
analyzer.Dispose();
return(results);
}
else
{
var parser = new MultiFieldQueryParser(Version.LUCENE_30, new[] { "Id", "Title", "Description", "Time", "Browses", "Category", "UserId" }, analyzer);
var query = ParseQuery(searchQuery, parser);
var hits = searcher.Search(query, null, hitsLimit, Sort.RELEVANCE).ScoreDocs;
hits = hits.Skip((pageIndex - 1) * pageSize).Take(pageSize).ToArray();
var results = MapLuceneToDataList(hits, searcher);
foreach (var item in results)
{
item.Description = SearcherBase.SimpleHighLighter(item.Description, searchQuery, "<font color='#C60A00'>", "</font>", 226);
}
analyzer.Close();
return(results);
}
}
}
