1。資料庫中新增資料

增加新紀錄：

IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(), false);

false：在原先基礎上新增，不覆蓋之前，增量索引

true：重新建立

2。資料庫中更新資料

判斷是否有

刪除陳舊記錄：

public void updateIndex(){

  String INDEX_DIR = "d:\\index_update";
  Directory dir;
  try {
   dir = FSDirectory.getDirectory(INDEX_DIR);
   IndexReader reader = IndexReader.open(dir);
   Term term = new Term("ID","1"); //---精確查詢，刪除此紀錄

   dir = FSDirectory.getDirectory(INDEX_DIR);
   IndexReader reader1 = IndexReader.open(dir);
   Term term1 = new Term("ID","1"); 
   Query query1 = new TermQuery(term);
   IndexSearcher is1 = new IndexSearcher(dir);
   Hits hits1 = is1.search(query1);
   System.out.println("刪除後"+ hits1.length() + "  個結果! ");

//   IndexWriter writer = new IndexWriter(dir, new StandardAnalyzer(), false);
//   Document doc = new Document();
//   doc.add(new Field("TicketType", "演唱會111", Field.Store.YES, Field.Index.TOKENIZED)); 
//   writer.addDocument(doc);
//   writer.optimize();
//   System.out.println("更改索引："+doc.getField("TicketType").stringValue());
//   writer.close();
  } catch (IOException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
  } 
  

 }