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| <title>Element collection mapping</title> |
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| <meta name="doctitle" content="Element collection mapping" /> |
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| <p class="betadraftsubtitle">Beta Draft: 2013-01-03</p> |
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| <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 > 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"><TABLE_NAME></span>", |
| joinColumns=@JoinColumn(name="<span class="italic"><COLUMN_TABLE></span>") |
| ) |
| @Column(name="<span class="italic"><COLUMN_TABLE></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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