1
通过期限删除文件下面的代码不能按预期期限由删除文件:从Lucene的
RAMDirectory idx = new RAMDirectory();
IndexWriter writer = new IndexWriter(idx,
new SnowballAnalyzer(Version.LUCENE_30, "English"),
IndexWriter.MaxFieldLength.LIMITED);
Document doc = new Document();
doc.add(new Field("title", "mydoc", Field.Store.YES, Field.Index.NO));
doc.add(new Field("content", "some content, deleteme", Field.Store.YES, Field.Inde
x.ANALYZED));
writer.addDocument(doc);
Document doc2 = new Document();
doc2.add(new Field("title", "mydoc2", Field.Store.YES, Field.Index.NO));
doc2.add(new Field("content", "other content, don't deleteme", Field.Store.YES, Field.I
ndex.ANALYZED));
writer.addDocument(doc2);
writer.optimize();
writer.close();
/*
IndexReader reader = IndexReader.open(idx, false);
int docs_up_for_deletion = reader.docFreq(new Term("title"));
int before = reader.numDocs();
int docs_deleted = reader.deleteDocuments(new Term("title", "mydoc"));
reader.close();
*/
IndexWriter writer2 = new IndexWriter(idx,
new SnowballAnalyzer(Version.LUCENE_30, "English"),
IndexWriter.MaxFieldLength.LIMITED);
int before = writer2.numDocs();
writer2.deleteDocuments(new Term("title", "mydoc"));
writer2.commit();
writer2.optimize();
int after = writer2.numDocs();
writer2.close();
int docs_deleted = before - after;
我试着用的IndexReader和IndexWriter类既不作品删除。
我也试过在上面的代码之后添加另一个IndexReader搜索,以防数字在关闭writer2后出现更新(在this FAQ中提到),但这没有帮助。做一个writer.deleteAll()的作品,而不是根据术语删除。
我发现了一个旧引用的事实,只有类型Field.Keyword的字段可以被删除,但这不再是Lucene的3.x的一个有效字段类型