用dotLucene为数据库内容建立索引
//建立索引的类
public class Indexer
{
private IndexWriter writer;
Document doc = new Document();
public Indexer(string Directory)
{
InitializeIndex(Directory);
}
public void InitializeIndex(string Directory)
{
writer = new IndexWriter(Directory, new StandardAnalyzer(), true);
writer.SetUseCompoundFile(true);
}
public void AddDocument(string DateAdded , string Description , string URL , string Title )
{
doc.Add(Field.Keyword("date", DateAdded));
doc.Add(Field.Text("description", Description));
doc.Add(Field.Text("url", URL));
doc.Add(Field.Text("title", Title));
doc.Add(Field.Keyword("sortdate", ReturnSortDate(DateTime.Parse(DateAdded)).ToString()));
writer.AddDocument(doc);
}
private int ReturnSortDate(DateTime DateAdded)
{
string thisMonth = DateAdded.Month.ToString();
if (thisMonth.Length == 1)
{
thisMonth = "0" + thisMonth;
}
string thisYear = DateAdded.Year.ToString();
string thisDay = DateAdded.Day.ToString();
if( thisDay.Length == 1 )
{
thisDay = "0" + thisDay;
}
int time = int.Parse(thisYear+thisMonth +thisDay);
return time;
}
public void Close()
{
writer.Optimize();
writer.Close();
}
}
//搜索的类
public class Searcher
{
private IndexSearcher searcher;
public Searcher(string Directory)
{
searcher = new IndexSearcher(Directory);
}
public DataTable Search(string Query, string SortBy)
{
DataTable Results = new DataTable();
Results.Columns.Add("Title");
Results.Columns.Add("Description");
Results.Columns.Add("URL");
Results.Columns.Add("Published");
Query MyQuery = QueryParser.Parse(Query, "description", new StandardAnalyzer());
Sort sort = new Sort(SortBy, true);
Hits Hits = searcher.Search(MyQuery, sort);
int mTotalRecs = Hits.Length();
int iCount = 0;
while (iCount < mTotalRecs)
{
Document doc = Hits.Doc(iCount);
DataRow row = Results.NewRow();
row["url"] = doc.Get("url");
row["Title"] = doc.Get("title");
row["Description"] = doc.Get("description");
row["Published"] = doc.Get("date");
Results.Rows.Add(row);
iCount++;
}
searcher.Close();
return Results;
}
}
本文来自博客园,作者:古道轻风,转载请注明原文链接:https://www.cnblogs.com/88223100/archive/2008/08/18/1270630.html
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