Apache lucene query example how to#
Apache lucene query example full#

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Subclasses of Query should use createWeight(.Searcher), instead. Here's a simple example: String str 'foo bar' String id '123456' BooleanQuery bq new BooleanQuery() Query query qp.parse(str) bq.add(query, ) bq. Configuring the Index .

Apache lucene query example how to#

This example application demonstrates how to perform some operations with Apache Lucene: This application parses some JSON files with Jackson, indexes their content with Lucene and performs some searches. Apache Lucene is a high-performance text search engine library written entirely in Java. Never ever use this method in Weight implementations. Example of indexing and searching with Apache Lucene. Prints a query to a string, with field assumed to be the default field and omitted.ĭeprecated. Comparisons are fast The term dictionary is enumerated in an intelligent way, to avoid comparisons. Sets the boost for this query clause to b. A fast regular expression query based on the .automaton package. queries)Įxpert: Merges the clauses of a set of BooleanQuery's into a single BooleanQuery.Įxpert: Called to re-write queries into primitive queries. Static Query mergeBooleanQueries(BooleanQuery. Instead of using 'runtime' subclassing/delegation, subclass the Weight instead. Similarity getSimilarity(Searcher searcher)ĭeprecated. The following table shows the different class methods − S.No.Įxpert: Called when re-writing queries under MultiSearcher.Įxpert: Constructs an appropriate Weight implementation for this query.Įxpert: Adds all terms occurring in this query to the terms set. The following table shows a class constructor − S.No. Class Declarationįollowing is the declaration for .Query class − TopDocs results = arch(query, 10) įor (ScoreDoc result : results.Query is an abstract class and contains various utility methods and is the parent of all types of queries that Lucene uses during search process. You can also use the project created in Lucene - First Application chapter as such for this chapter to understand the searching process. With its wide array of configuration options and. Create a project with a name LuceneFirstApplication under a package as explained in the Lucene - First Application chapter.

Apache lucene query example full#

Users enter one or more terms to query an index, and they receive their answer back. Apache Lucene is a powerful Java library used for implementing full text search on a corpus of text. Search for results of the query in the index Ad hoc queries are the user-friendly queries of Lucene. A Lucene querys syntax has three parts a field name, an operator, and a search term which is often enclosed in double quotes. The Lucene parser supports complex query formats, such as field-scoped queries, fuzzy search, infix and suffix wildcard search, proximity search. QueryParser parser = new QueryParser('text', analyzer) When constructing queries for Azure Cognitive Search, you can replace the default simple query parser with the more powerful Lucene query parser to formulate specialized and advanced query expressions. IndexSearcher searcher = new IndexSearcher(reader) This Java tutorial shows how to use Lucenes PhraseQuery and QueryParser classes to perform queries. IndexReader reader = DirectoryReader.open(dir) Index the document and close the writer IndexWriter writer = new IndexWriter(dir, config) ĭoc.add(new TextField('text', 'Hello World!', )) IndexWriterConfig config = new IndexWriterConfig(analyzer) Public static void main(String args) throws IOException, ParseExceptionĪnalyzer analyzer = new StandardAnalyzer() Note: RAMDirectory creates a memory-resident index, and is handy for experimenting and testing, but in practice most people will need to have an index stored in the file system (see FSDirectory.open). This basic Lucene example creates a simple index, and searches on it.