public SearchResult FindSimular(string key, int resultOffset, int resultLength, bool matchCategory)
{
var pageQuery = new TermQuery(new Term("key", key));
var topDocs = _searcher.Search(pageQuery, 1);
if (topDocs.TotalHits == 0)
{
return(new SearchResult());
}
var doc = topDocs.ScoreDocs[0].Doc;
var moreLikeThis = new MoreLikeThis(_reader)
{
Analyzer = _analyzer,
MinWordLen = 3
};
moreLikeThis.SetFieldNames(new[] { "title", "summary", "content", "tags" });
moreLikeThis.SetStopWords(StopWords.DefaultEnglish);
moreLikeThis.MinDocFreq = 2;
var query = moreLikeThis.Like(doc);
var startTime = DateTime.Now;
var ticks = DateTime.Now.ToUniversalTime().Ticks;
Query publishStartQuery = NumericRangeQuery.NewLongRange("publishStart", null, ticks, true, false);
Query publishStopQuery = NumericRangeQuery.NewLongRange("publishStop", ticks, null, false, true);
var booleanQuery = new BooleanQuery {
{ query, Occur.MUST },
{ pageQuery, Occur.MUST_NOT },
{ publishStartQuery, Occur.MUST },
{ publishStopQuery, Occur.MUST }
};
if (matchCategory)
{
var document = _searcher.Doc(doc);
var field = document.GetField("category");
if (field != null && !string.IsNullOrEmpty(field.StringValue))
{
var categoryQuery = new TermQuery(new Term("category", field.StringValue.ToLowerInvariant()));
booleanQuery.Add(categoryQuery, Occur.MUST);
}
}
var scoreDocs = _searcher.Search(booleanQuery, null, MaxHits, Sort.RELEVANCE).ScoreDocs;
var result = new SearchResult {
NumberOfHits = scoreDocs.Length
};
if (resultOffset < scoreDocs.Length)
{
var resultUpperOffset = resultOffset + resultLength;
if (resultUpperOffset > scoreDocs.Length)
{
resultUpperOffset = scoreDocs.Length;
}
for (int i = resultOffset; i < resultUpperOffset; i++)
{
Document document = _searcher.Doc(scoreDocs[i].Doc);
Guid pageId;
(document.Get("pageId") ?? string.Empty).TryParseGuid(out pageId);
var hit = new SearchHit {
PageId = pageId,
Path = document.Get("path"),
Title = document.Get("title"),
Excerpt = document.Get("summary")
};
//foreach (string key in metaData) {
// hit.MetaData.Add(key, document.Get(key));
//}
result.Hits.Add(hit);
}
}
var timeTaken = DateTime.Now - startTime;
result.SecondsTaken = timeTaken.TotalSeconds;
return(result);
}
private SearchResult ExecuteQuery(string[] metaData, int resultOffset, int resultLength, Query query)
{
var startTime = DateTime.Now;
var ticks = DateTime.Now.ToUniversalTime().Ticks;
//针对多个域的一次性查询
//Query publishStartQuery = NumericRangeQuery.NewLongRange("publishStart", null, ticks, true, false);
//Query publishStopQuery = NumericRangeQuery.NewLongRange("publishStop", ticks, null, false, true);
var booleanQuery = new BooleanQuery {
{ query, Occur.MUST },
//{publishStartQuery, Occur.MUST},
//{publishStopQuery, Occur.MUST}
};
//TopDocs docs = _searcher.Search(query, (Filter)null, MaxHits);
var scoreDocs = _searcher.Search(booleanQuery, null, MaxHits, Sort.RELEVANCE).ScoreDocs;
var result = new SearchResult {
NumberOfHits = scoreDocs.Length
};
// Create highlighter
IFormatter formatter = new SimpleHTMLFormatter("<span class=\"search-highlight;\">", "</span>");
var fragmenter = new SimpleFragmenter(120);
var scorer = new QueryScorer(query);
var highlighter = new Highlighter(formatter, scorer)
{
TextFragmenter = fragmenter
};
if (resultOffset < scoreDocs.Length)
{
var resultUpperOffset = resultOffset + resultLength;
if (resultUpperOffset > scoreDocs.Length)
{
resultUpperOffset = scoreDocs.Length;
}
for (var i = resultOffset; i < resultUpperOffset; i++)
{
var doc = scoreDocs[i];
var document = _searcher.Doc(doc.Doc);
var content = document.Get("content");
var excerpt = "";
if (content != null)
{
var stream = _analyzer.TokenStream("", new StringReader(document.Get("content")));
excerpt = highlighter.GetBestFragments(stream, document.Get("content"), 2, "...");
}
Guid pageId;
(document.Get("pageId") ?? string.Empty).TryParseGuid(out pageId);
var hit = new SearchHit {
PageId = pageId,
Path = document.Get("path"),
Title = document.Get("title"),
Excerpt = excerpt
};
foreach (var key in metaData)
{
hit.MetaData.Add(key, document.Get(key));
}
result.Hits.Add(hit);
}
}
var timeTaken = DateTime.Now - startTime;
result.SecondsTaken = timeTaken.TotalSeconds;
return(result);
}
