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Timo Westkämper 2008-10-16 12:25:02 +00:00
parent a84fd06c10
commit 3735eb5b60
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querydsl-root/src/site/xdoc/index.xml
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<document>
<properties>
<author email="timo@mysema.com">Timo Westkämper</author>
<title>querydsl</title>
<title>Querydsl</title>
</properties>
<body>
<section name="querydsl">
<section name="Querydsl">
<p>
querydsl (spell: querydiesel) is a framework which enables the construction of statically typed SQL-like queries.
Querydsl (spell: query diesel) is a framework which enables the construction of statically typed SQL-like queries.
Instead of writing queries as inline strings or externalizing them into XML files they can be constructed via a
<a href="http://www.martinfowler.com/bliki/FluentInterface.html">fluent</a>
<a href="http://www.martinfowler.com/bliki/DomainSpecificLanguage.html">DSL</a>/API like querydsl.
<a href="http://www.martinfowler.com/bliki/DomainSpecificLanguage.html">DSL</a>/API like Querydsl.
</p>
<p>
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<p>
Here a quick example for the impatient ones :
<source>
public SearchResults&lt;Bookmark&gt; findBookmarksWithTags(String[] tagNames,
<span style="font-weight:bold;">public</span> SearchResults&lt;Bookmark&gt; findBookmarksWithTags(String[] tagNames,
QueryModifiers mod) {
return select(distinct(bookmark)).from(bookmark)
.innerJoin(FETCH, bookmark.address)
.innerJoin(bookmark.tags.as(tag1))
.where(tag1.name.in(tagNames))
.orderBy(bookmark.created.desc()).restrict(mod).listResults();
<span style="font-weight:bold;">return</span> select(distinct(<span style="color:blue;">bookmark</span>)).from(<span style="color:blue;">bookmark</span>)
.innerJoin(<span style="color:blue;">FETCH</span>, <span style="color:blue;">bookmark.address</span>)
.innerJoin(<span style="color:blue;">bookmark.tags</span>.as(<span style="color:blue;">tag1</span>))
.where(<span style="color:blue;">tag1.name</span>.in(tagNames))
.orderBy(<span style="color:blue;">bookmark.created</span>.desc()).restrict(mod).listResults();
}
</source>
which represents the followoing HQL query
<source>
select distinct bookmark from Bookmark bookmark
inner join fetch bookmark.address
inner join bookmark.tags as tag1
where tag1.name in :tagNames
oirder by bookmark.created desc
</source>
</p>
<p>