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<title>Element collection mapping</title>
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<p class="betadraftsubtitle">Beta Draft: 2013-01-03</p>
<p><a id="CIHHJEBJ" name="CIHHJEBJ"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>Element collection mapping<a id="sthref209" name="sthref209"></a><a id="sthref210" name="sthref210"></a><a id="sthref211" name="sthref211"></a></h1>
<p>Use an <span class="bold">Element Collection</span> to define a collection of <span class="bold">Basic</span> objects. The Basic values are stored in a separate collection table. Because the target is a Basic value (instead of an Entity), you can easily define collections of simple values without having to define a class for the value.</p>
<p>To create an element collection mapping:</p>
<ol>
<li>
<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, right-click the field to map. Select <span class="bold">Map As &gt; Element Collection</span>. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected field.</p>
<div class="figure"><a id="sthref212" name="sthref212"></a>
<p class="titleinfigure">JPA Details, Element collection mapping</p>
<img src="img/jpa_details_elementcollection.png" alt="PA Details, Element collection mapping" title="PA Details, Element collection mapping" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Complete each field in the <a href="reference034.htm#CACBCGDI">Element Collection Mapping</a> area.</p>
</li>
<li>
<p>Complete the remaining areas in the <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a>.</p>
</li>
</ol>
<p>Eclipse adds the following annotations to the field:</p>
<pre xml:space="preserve" class="oac_no_warn">
@ElementCollection
@CollectionTable(
        name="<span class="italic">&lt;TABLE_NAME&gt;</span>",
        joinColumns=@JoinColumn(name="<span class="italic">&lt;COLUMN_TABLE&gt;</span>")
)
@Column(name="<span class="italic">&lt;COLUMN_TABLE&gt;</span>")
</pre>
<a id="sthref213" name="sthref213"></a>
<p class="subhead2">Related tasks</p>
<ul>
<li>
<p><a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a></p>
</li>
</ul>
<a id="sthref214" name="sthref214"></a>
<p class="subhead2">Related references</p>
<ul>
<li>
<p><a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a></p>
</li>
<li>
<p><a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a></p>
</li>
<li>
<p><a href="tasks011.htm#BABBABCE">Basic mapping</a></p>
</li>
<li>
<p><a href="reference053.htm#CIADGCID">Converters</a></p>
</li>
<li>
<p><a href="reference046.htm#CACBIJFD">Ordering</a></p>
</li>
<li>
<p><a href="reference044.htm#CACJBFEA">Value</a></p>
</li>
</ul>
<a id="sthref215" name="sthref215"></a>
<p class="subhead2">Related concepts</p>
<ul>
<li>
<p><a href="concept_mapping.htm#BABBDJFI">Understanding OR mappings</a></p>
</li>
<li>
<p><a href="concepts001.htm#BABBGFJG">Understanding Java Persistence API</a></p>
</li>
</ul>
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