Lucene学习总结-高级查询

Field cache：在一个IndexReader生命周期内，用于排序。

Sort：Sort.RELEVANCE，Sort.INDEXORDER，按照Field排序new Sort("category")，升序new Sort("pubmonth", true)，

IndexSearcher searcher = new IndexSearcher(directory);
TopDocs results = searcher.search(query, null, 20, sort);

多个Field排序：

new Sort(new SortField[]{
new SortField("category"),
SortField.FIELD_SCORE,
new SortField("pubmonth", SortField.INT, true)
})

MultiPhraseQuery：类似于PhraseQuery，可以设置多个短语的查询。

MultiPhraseQuery query = new MultiPhraseQuery();
query.add(new Term[] { // #1
new Term("field", "quick"), // #1
new Term("field", "fast") // #1
});
query.add(new Term("field", "fox"));
TopDocs hits = searcher.search(query, 10);
query.setSlop(1);
hits = searcher.search(query, 10);

SpanTermQuery：没神马特殊。

SpanFirstQuery：从开头开始的n个term包含查询项。

SpanFirstQuery sfq = new SpanFirstQuery(brown, 2);

SpanQuery，不能用QueryParser。

过滤查询：

String jan1 = TestUtil.parseDate("2004-01-01");
String jan31 = TestUtil.parseDate("2004-01-31");
String dec31 = TestUtil.parseDate("2004-12-31");
RangeFilter filter = new RangeFilter("modified", jan1, dec31, true, true);

Filter filter = new FieldCacheTermsFilter("pubmonth",new String[] {"199910","200406"});

TermQuery categoryQuery = new TermQuery(new Term("category", "/philosophy/eastern"));
Filter categoryFilter = new QueryWrapperFilter(categoryQuery);

Filter prefixFilter = new PrefixFilter(new Term("pubmonth", "19"));

MultiSearcher：

MultiSearcher searcher = new MultiSearcher(searchers);
// range spans documents across both indexes
RangeQuery query = new RangeQuery("animal", "h", "t", true, true);// #3
query.setConstantScoreRewrite(true);
TopDocs hits = searcher.search(query, 10);

ParallelMultiSearcher：

远程查询：

LocateRegistry.createRegistry(1099);
Searchable[] searchables = new Searchable[ALPHABET.length()];
Searcher multiSearcher = new MultiSearcher(searchables);
RemoteSearchable multiImpl = new RemoteSearchable(multiSearcher);
Naming.rebind("//localhost/LIA_Multi", multiImpl);
Searcher parallelSearcher = new ParallelMultiSearcher(searchables);
RemoteSearchable parallelImpl = new RemoteSearchable(parallelSearcher);
Naming.rebind("//localhost/LIA_Parallel", parallelImpl);

TermFreqVector：

FieldSelector：