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From Trevor Watson <twat...@datassimilate.com>
Subject C# - Bulk Update
Date Mon, 23 Jul 2012 15:05:21 GMT
     I've come across this piece of code in a project that I've been 
working on and was wondering if there's a more efficient way to 
bulk-update items.  I know there is no in-library bulk update and we'll 
have to loop through documents, but this seemed messy to me.

Any assistance would be greatly appreciated

Trevor

----------- C# Code Start  -----------
  public static int BulkUpdateField(string indexPath, string 
queryString, string fieldName, object newValue)
         {
             int rowCount = 0;

             // Create needed Lucene connections
             using (IndexReader reader = IndexReader.Open(new 
Lucene.Net.Store.SimpleFSDirectory(new DirectoryInfo(indexPath))))
             using (Lucene.Net.Analysis.Analyzer analyzer = getAnalyzer())
             using (Lucene.Net.Search.Searcher searcher = 
getSearcher(indexPath))
             using (IndexWriter writer = new IndexWriter(new 
Lucene.Net.Store.SimpleFSDirectory(new DirectoryInfo(indexPath)), false, 
analyzer, false))
             {

                 // Create query
                 Lucene.Net.QueryParsers.QueryParser qp = new 
Lucene.Net.QueryParsers.QueryParser("FileId", analyzer);
                 Query query = qp.Parse(queryString);
                 // Run query (to get total count of documents)
                 TopDocs td = searcher.Search(query, 1);
                 // Make sure there are documents
                 if (td.TotalHits == 0)
                     return 0;

                 // Get all documents in query
                 td = searcher.Search(query, td.TotalHits);

                 // Foreach document
                 foreach (ScoreDoc doc in td.ScoreDocs)
                 {
                     rowCount++;

                     // Update document
                     Document currentDoc = reader.Document(doc.Doc);
currentDoc.GetField(fieldName).SetValue(newValue.ToString());
                     // Resave document
                     writer.UpdateDocument(new Term("FileId", 
currentDoc.GetField("FileId").StringValue()), currentDoc);
                 }

                 // Clean out deletes from UpdateDocument
                 writer.ExpungeDeletes();

                 // Save to index
                 writer.Commit();
                 // Close connections
                 writer.Close();
                 reader.Close();
                 searcher.Close();
                 analyzer.Close();
             }

             return rowCount;
         }
----------- C# Code End -----------

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