15.17. Collection member references

<div class="paragraph">

References to collection-valued associations actually refer to the _values_ of that collection.

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<div id="hql-collection-valued-associations-example" class="exampleblock">
<div class="title">Example 379. Collection references example</div>
<div class="content">
<div class="listingblock">
<div class="content">
<pre class="prettyprint highlight">`List&lt;Phone&gt; phones = entityManager.createQuery(
    "select ph " +
    "from Person pr " +
    "join pr.phones ph " +
    "join ph.calls c " +
    "where pr.address = :address " +
    "  and c.duration &gt; :duration", Phone.class )
.setParameter( "address", address )
.setParameter( "duration", duration )
.getResultList();

// alternate syntax
List&lt;Phone&gt; phones = session.createQuery(
    "select pr " +
    "from Person pr, " +
    "in (pr.phones) ph, " +
    "in (ph.calls) c " +
    "where pr.address = :address " +
    "  and c.duration &gt; :duration" )
.setParameter( "address", address )
.setParameter( "duration", duration )
.list();`</pre>
</div>
</div>
</div>
</div>
<div class="paragraph">

In the example, the identification variable `ph` actually refers to the object model type `Phone`, which is the type of the elements of the `Person#phones` association.

</div>
<div class="paragraph">

The example also shows the alternate syntax for specifying collection association joins using the `IN` syntax.
Both forms are equivalent.
Which form an application chooses to use is simply a matter of taste.

</div>
</div>
<div class="sect2">