获取特定查询的错误

Question

这是Lucene的新手.我在Java客户端中使用Hibernate,并且在特定查询中遇到此错误:

HSEARCH000146: The query string 'a' applied on field 'name' has no meaningfull tokens to  
be matched. Validate the query input against the Analyzer applied on this field.

搜索适用于所有其他查询,即使是空结果集.我的测试数据库确实记录了'a'.这可能有什么问题？

Answer 1

'a'是一个停用词,将由StandardAnalyzer过滤掉您的查询.停用词是您搜索的语言中常见的单词,对于生成搜索结果不具有意义.这是一个简短的清单,但'a'是英语中的一个.

由于分析器已经摆脱了该术语,并且它是唯一存在的术语,因此您现在发送一个空查询,这是不可接受的,并且搜索失败.

对于好奇,这些是标准的Lucene英语关键词:

"a", "an", "and", "are", "as", "at", "be", "but", "by",
"for", "if", "in", "into", "is", "it",
"no", "not", "of", "on", "or", "such",
"that", "the", "their", "then", "there", "these",
"they", "this", "to", "was", "will", "with"

如果你不想删除停用词,那么你应该设置你Analyzer没有StopFilter,或者设置一个空的停止词.在这种情况下StandardAnalyzer,您可以将自定义停止集传递给构造函数:

Analyzer analyzer = new StandardAnalyzer(CharArraySet.EMPTY_SET);