Lucene in Action阅读笔记（1）--Yin

为了保证项目按时完成，我每天都会抽出一定的时间阅读《Lucene in Action 2nd edtion》，以下为读书笔记，形式可能略显杂乱，但都是我的个人心得，或者原文摘录的经典之处。

1. how to delete a Document or update a existing Document

Delete a Document

ƒ deleteDocuments(Term)　　deletes all documents containing the provided term.
ƒ deleteDocuments(Term[])　　deletes all documents containing any of the terms in the provided array.
ƒ deleteDocuments(Query)　　deletes all documents matching the provided query.
ƒ deleteDocuments(Query[])　　deletes all documents matching any of the queries in the provided array.
ƒ deleteAll()　　deletes all documents in the index. This is exactly the same as closing the writer and opening a new writer with create=true, without having to close your writer

Usage:

writer.deleteDocuments(new Term("ID", documentID));

Update a Document

writer.updateDocument(new Term("ID", documenteId), newDocument);

Warning:由于updateDocument()内部通过调用deleteDocuments首先删除包含指定Term的文档，因此，需要保证Term的唯一性