在lucene.net中,我们可以在不提供字段名称的情况下搜索内容.它将搜索所有已编入索引的字段吗？

Question

在lucene.net中,我们可以在不提供字段名称的情况下搜索内容.它将搜索所有已编制索引的字段.

Answer 1

您不能在不提供字段名称的情况下搜索内容,但是您可以使用MultiFieldQueryParser搜索所有可用字段.

例如

Dim queryParser = New MultiFieldQueryParser(Version.LUCENE_29, _
    indexReader__1.GetFieldNames(IndexReader.FieldOption.ALL).ToArray(), analyzer)

这是一个完整的例子.

'get index directory
Dim directory As Directory = FSDirectory.Open(New DirectoryInfo(HostingEnvironment.MapPath(VirtualIndexPath)))

'get analyzer
Dim analyzer As Analyzer = New StandardAnalyzer(Version.LUCENE_29)

'get index reader and searcher
Dim indexReader__1 As IndexReader = IndexReader.Open(directory, True)
Dim indexSearch As Searcher = New IndexSearcher(indexReader__1)

'add all possible fileds in multifieldqueryparser using indexreader getFieldNames method
Dim queryParser = New MultiFieldQueryParser(Version.LUCENE_29, _
    indexReader__1.GetFieldNames(IndexReader.FieldOption.ALL).ToArray(), analyzer)
Dim query = queryParser.Parse(Criteria)
Dim resultDocs As TopDocs = Nothing

'perform search
resultDocs = indexSearch.Search(query, indexReader__1.MaxDoc())
Dim hits = resultDocs.scoreDocs

希望有所帮助