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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="description" content="Querydsl">
<meta name="author" content="Timo Westkämper">
<link rel="shortcut icon" href="ico/favicon.ico">
<title>Querydsl - Unified Queries for Java</title>
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<body class="frontpage">
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<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
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<a class="navbar-brand" href="index.html">Querydsl</a>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="team.html">Team</a></li>
<li><a href="releases.html">Releases</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="http://www.github.com/querydsl/querydsl">GitHub</a></li>
<li><a href="https://groups.google.com/forum/#!forum/querydsl">Google Group</a></li>
<li><a href="http://www.github.com/querydsl/querydsl/issues">Issues</a></li>
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</div>
<div class="hero">
<h1>Unified Queries for Java.<br/>
Querydsl is compact, safe<br/>
and easy to learn.<br/>
</h1>
</div>
<div class="container">
<!--
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<h1>Querydsl</h1>
<h2>Unified Queries for Java</h2>
<p>Querydsl provides a unified querying layer for multiple backends in Java. Compared to the alternatives Querydsl is more compact, safer and easier to learn. Try it today!</p>
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</td>
</tr>
</table>
</div>
<section id="modules">
<div class="row">
<div class="col-md-3">
<h2>Modules</h2>
</div>
<div class="col-md-3">
<h4>JPA</h4>
<p>The popular choice for SQL persistence with a focus on CRUD and simple queries for object loading. <a href="https://github.com/querydsl/querydsl/tree/master/querydsl-jpa">more...</a></p>
</div>
<div class="col-md-3">
<h4>SQL</h4>
<p>The alternative SQL abstraction with a focus on SQL operations and the full expressivity of the SQL standard. <a href="https://github.com/querydsl/querydsl/tree/master/querydsl-sql">more...</a></p>
</div>
<div class="col-md-3">
<h4>Mongodb</h4>
<p>ODM support via Morphia or Spring Data for MongoDB, the NoSQL of choice for many. <a href="https://github.com/querydsl/querydsl/tree/master/querydsl-mongodb">more...</a></p>
</div>
</div>
<div class="row">
<div class="col-md-3"> </div>
<div class="col-md-3">
<h4>JDO</h4>
<p>JDO support for Object, SQL and NoSQL storage abstraction. <a href="https://github.com/querydsl/querydsl/tree/master/querydsl-jdo">more...</a></p>
</div>
<div class="col-md-3">
<h4>Lucene</h4>
<p>Full text indexing via Lucene, the most popular fulltext index for Java. <a href="https://github.com/querydsl/querydsl/tree/master/querydsl-lucene4">more...</a></p>
</div>
<div class="col-md-3">
<h4>Collections</h4>
<p>Java Collection querying for Java Beans and POJOs. <a href="https://github.com/querydsl/querydsl/tree/master/querydsl-collections">more...</a></p>
</div>
</div>
</section>
<section id="docs">
<div class="row">
<div class="col-md-3">
<h2>Documentation</h2>
</div>
<div class="col-md-3">
<h4>Releases</h4>
<p>Version selection <select class="version"></select></p>
<ul>
<li><a class="docs" href="#">Reference documentation</a></li>
<li><a class="javadocs" href="#">Javadocs</a></li>
</ul>
</div>
<div class="col-md-3">
<h4>Blog posts</h4>
<p>Documentation is also available in the form of blog posts.</p>
<ul>
<li><a href="http://blog.mysema.com/2013/03/querydsl-30-in-nutshell.html">Querydsl 3.0 in a nutshell</a></li>
<li><a href="http://blog.mysema.com/2011/08/querydsl-in-wild.html">Querydsl in the wild</a>
</li><li><a href="http://blog.mysema.com/2011/01/querying-in-sql-with-querydsl.html">Querying in SQL with Querydsl</a></li>
<li><a href="http://blog.mysema.com/2010/07/querying-hibernate-with-querydsl.html">Querying Hibernate with Querydsl</a></li>
<li><a href="http://blog.mysema.com/2010/11/mongodb-with-querydsl.html">MongoDB with Querydsl</a></li>
<li><a href="http://blog.mysema.com/2010/10/sql-queries-in-scala.html">SQL queries in Scala</a></li>
<li><a href="http://blog.mysema.com/2010/10/using-querydsl-in-eclipse.html">Using Querydsl in Eclipse</a></li>
<li><a href="http://blog.mysema.com/2010/09/querying-with-scala.html">Querying with Scala</a></li>
<li><a href="http://blog.mysema.com/2010/07/query-extensions-in-action.html">Query Extensions in Action</a></li>
<li><a href="http://blog.mysema.com/2010/04/querydsl-as-alternative-to-jpa-2.html">Querydsl as an alternative to the JPA 2 Criteria API</a></li>
</ul>
</div>
</div>
</section>
<section id="examples">
<div class="row">
<div class="col-md-3">
<h2>Examples</h2>
</div>
<div class="col-md-5">
<h4>Basic query</h4>
<pre class="prettyprint">
List<Person> persons = queryFactory.selectFrom(person)
.where(
person.firstName.eq("John"),
person.lastName.eq("Doe"))
.fetch();
</pre>
</div>
<div class="col-md-4">
<h4>Order</h4>
<pre class="prettyprint">
List<Person> persons = queryFactory.selectFrom(person)
.orderBy(person.lastName.asc(),
person.firstName.desc())
.fetch();
</pre>
</div>
</div>
<div class="row">
<div class="col-md-3"> </div>
<div class="col-md-5">
<h4>Subqueries</h4>
<pre class="prettyprint">
List<Person> persons = queryFactory.selectFrom(person)
.where(person.children.size().eq(
JPAExpressions.select(parent.children.size().max())
.from(parent)))
.fetch();
</pre>
</div>
<div class="col-md-4">
<h4>Tuple projection</h4>
<pre class="prettyprint">
List<Tuple> tuples = queryFactory.select(
person.lastName, person.firstName, person.yearOfBirth)
.from(person)
.fetch();
</pre>
</div>
</div>
</section>
<section id="community">
<div class="row">
<div class="col-md-3">
<h2>Community</h2>
</div>
<div class="col-md-3">
<h4>Querydsl Group</h4>
<a href="https://groups.google.com/forum/#!forum/querydsl">Querydsl Group</a> provides a free support forum and a place to discuss Querydsl design issues.
</div>
<div class="col-md-3">
<h4>GitHub</h4>
<a href="https://github.com/querydsl/querydsl">GitHub</a> is where Querydsl is hosted. Querydsl is licensed under the
<a href="http://www.apache.org/licenses/LICENSE-2.0.html">Apache 2.0 license</a>
</div>
<div class="col-md-3">
<h4>Twitter</h4>
<a href="http://www.twitter.com/querydsl">Twitter</a> is used for release announcements and links to articles on Querydsl
</div>
</div>
<div class="row">
<div class="col-md-3"> </div>
<div class="col-md-4">
<h4>Community blog posts</h4>
</div>
</div>
<div class="row">
<div class="col-md-3"> </div>
<div class="col-md-3">
<ul>
<li><a href="https://www.baeldung.com/intro-to-querydsl">Intro to Querydsl</a></li>
<li><a href="https://www.baeldung.com/querydsl-with-jpa-tutorial">Querydsl with JPA tutorial</a></li>
<li><a href="http://www.hascode.com/2014/02/creating-elegant-typesafe-queries-for-jpa-mongodbmorphia-and-lucene-using-querydsl/">Creating elegant, typesafe Queries ...</a></li>
<li><a href="https://vaadin.com/blog/-/blogs/querydsl-powered-vaadin-persistence">Querydsl powered Vaadin persistence</a></li>
<li><a href="http://luisfpg.blogspot.fi/2013/02/the-beauty-of-querydsl-in-sorting.html">The beauty of Querydsl: calling database functions</a></li>
<li><a href="http://mnmlst-dvlpr.blogspot.fi/2013/07/xtend-and-querydsl-concise-typesafe.html">Xtend and Querydsl</a></li>
<li><a href="http://www.baeldung.com/rest-api-search-language-spring-data-querydsl">REST Query Language with Spring Data JPA and Querydsl</a></li>
</ul>
</div>
<div class="col-md-3">
<ul>
<li><a href="http://www.petrikainulainen.net/programming/spring-framework/spring-data-jpa-tutorial-using-querydsl-in-a-multi-module-maven-project/">Using Querydsl in a Multi-module Maven Project</a></li>
<li><a href="http://www.petrikainulainen.net/programming/spring-framework/spring-data-jpa-tutorial-part-five-querydsl/">Spring Data JPA Tutorial Part Five</a></li>
<li><a href="http://koelec.blogspot.fi/2012/03/filter-expressions-in-rest-urls.html">Filter expressions in Rest urls leveraging Querydsl Part 1</a></li>
<li><a href="http://www.techsand.com/2013/05/simple-pagination-for-mongodb-queries.html">Simple Pagination for MongoDB Queries Using Querydsl</a></li>
</ul>
</div>
<div class="col-md-3">
<ul>
<li><a href="https://blog.42.nl/articles/spring-data-jpa-with-querydsl-repositories-made-easy/">Spring Data JPA with QueryDSL</a></li>
<li><a href="http://spring.io/blog/2011/04/26/advanced-spring-data-jpa-specifications-and-querydsl/">Advanced Spring Data JPA - Specifications and Querydsl</a></li>
<li><a href="http://windowputty.blogspot.fi/2011/09/first-look-at-querydsl-with-jpa-2.html">First Look at Querydsl with JPA 2</a></li>
<li><a href="http://rjewalker.blogspot.fi/2010/06/querydsl-vs-jpa-20-criteria-api-first.html">Querydsl vs JPA 2.0 Criteria API: First-round knockout</a></li>
</ul>
</div>
</div>
</section>
<section id="related">
<div class="row">
<div class="col-md-3">
<h2>Related projects</h2>
</div>
<div class="col-md-3">
<h4>Integrations</h4>
<ul>
<li>Spring Data Querydsl integrations</li>
<ul>
<li><a href="https://spring.io/projects/spring-data-jpa">Spring Data JPA</a></li>
<li><a href="https://spring.io/projects/spring-data-mongodb">Spring Data MongoDB</a></li>
<a href="https://github.com/spring-projects/spring-data-examples/blob/master/mongodb/querydsl/README.md">Example</a>
</ul>
<li><a href="https://github.com/Blazebit/blaze-persistence">Blaze Persistence</a></li>
</ul>
</div>
<div class="col-md-3">
<h4>Extensions</h4>
<ul>
<li><a href="https://github.com/infobip/infobip-spring-data-querydsl">Infobip Spring Data Querydsl</a></li>
<li><a href="https://github.com/eXsio/querydsl-entityql">QueryDSL-EntityQL</a></li>
</ul>
</div>
</section>
</div> <!-- /container -->
<div id="footer">
<p>© 2015 - 2020 by The Querydsl Team</p>
<p>Querydsl licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0.html">Apache License, Version 2.0</a></p>
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