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64 lines
1.7 KiB
Markdown
64 lines
1.7 KiB
Markdown
## Querydsl Lucene 5
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The Lucene module provides integration with the Lucene 5 indexing library.
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**Maven integration**
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Add the following dependencies to your Maven project :
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```XML
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<dependency>
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<groupId>com.querydsl</groupId>
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<artifactId>querydsl-lucene5</artifactId>
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<version>${querydsl.version}</version>
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</dependency>
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<dependency>
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<groupId>org.slf4j</groupId>
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<artifactId>slf4j-log4j12</artifactId>
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<version>1.6.1</version>
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</dependency>
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```
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**Creating the query types**
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With fields year and title a manually created query type could look something like this:
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```JAVA
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public class QDocument extends EntityPathBase<Document>{
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private static final long serialVersionUID = -4872833626508344081L;
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public QDocument(String var) {
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super(Document.class, PathMetadataFactory.forVariable(var));
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}
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public final StringPath year = createString("year");
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public final StringPath title = createString("title");
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}
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```
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QDocument represents a Lucene document with the fields year and title.
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Code generation is not available for Lucene, since no schema data is available.
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**Querying**
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Querying with Querydsl Lucene is as simple as this:
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```JAVA
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QDocument doc = new QDocument("doc");
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IndexSearcher searcher = new IndexSearcher(index);
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LuceneQuery query = new LuceneQuery(true, searcher);
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List<Document> documents = query
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.where(doc.year.between("1800", "2000").and(doc.title.startsWith("Huckle"))
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.list();
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```
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which is transformed into the following Lucene query :
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```
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+year:[1800 TO 2000] +title:huckle*
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```
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For more information on the Querydsl Lucene module visit the reference documentation http://www.querydsl.com/static/querydsl/latest/reference/html/ch02s05.html
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