📅 最后修改于: 2020-11-12 04:47:33 🧑 作者: Mango
我们在上一章的Lucene-搜索操作中已经看到过，Lucene使用IndexSearcher进行搜索，并且使用QueryParser创建的Query对象作为输入。在本章中，我们将讨论各种类型的Query对象以及以编程方式创建它们的不同方法。创建不同类型的Query对象可以控制要进行的搜索类型。
考虑由许多应用程序提供的高级搜索的情况，其中为用户提供了多种选择来限制搜索结果。通过查询编程，我们可以很容易地实现相同目的。
以下是我们将在适当时候讨论的查询类型的列表。
| S.No. | Class & Description |
|---|---|
| 1 | TermQuery
This class acts as a core component which creates/updates indexes during the indexing process. |
| 2 | TermRangeQuery
TermRangeQuery is used when a range of textual terms are to be searched. |
| 3 | PrefixQuery
PrefixQuery is used to match documents whose index starts with a specified string. |
| 4 | BooleanQuery
BooleanQuery is used to search documents which are result of multiple queries using AND, OR or NOT operators. |
| 5 | PhraseQuery
Phrase query is used to search documents which contain a particular sequence of terms. |
| 6 | WildCardQuery
WildcardQuery is used to search documents using wildcards like ‘*’ for any character sequence,? matching a single character. |
| 7 | FuzzyQuery
FuzzyQuery is used to search documents using fuzzy implementation that is an approximate search based on the edit distance algorithm. |
| 8 | MatchAllDocsQuery
MatchAllDocsQuery as the name suggests matches all the documents. |