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<title>One-to-many mapping</title>
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<meta name="date" content="2013-04-05T12:21:35Z" />
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<meta name="doctitle" content="One-to-many mapping" />
<meta name="relnum" content="Release 3.3" />
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<p><a id="BABHGEBD" name="BABHGEBD"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>One-to-many mapping</h1>
<p><a id="sthref258" name="sthref258"></a><a id="sthref259" name="sthref259"></a><a id="sthref260" name="sthref260"></a><a id="sthref261" name="sthref261"></a>Use a <span class="bold">One-to-Many Mapping</span> to define a relationship with one-to-many multiplicity.</p>
<ol>
<li>
<p>In the <a href="ref_persistence_outline.htm#BABEGGFE">JPA Structure view</a>, select the field to map.</p>
</li>
<li>
<p>Right-click the field and then select <span class="bold">Map As &gt; One-to-many</span>. The <a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a> displays the properties for the selected.</p>
<div class="figure"><a id="sthref262" name="sthref262"></a>
<p class="titleinfigure">JPA Details, One-to-many Mapping</p>
<img src="img/jpa_details_onetomany.png" alt="JPA Details, One-to-many Mapping" title="JPA Details, One-to-many Mapping" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Complete each field in the <a href="reference040.htm#CACHGGHH">One-to-Many 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>
<ul>
<li>
<p><a href="reference047.htm#CACIJEGI">Joining Strategy</a></p>
</li>
<li>
<p><a href="reference045.htm#CACJCHJB">Converters</a></p>
</li>
<li>
<p><a href="reference046.htm#CACBIJFD">Ordering</a></p>
</li>
</ul>
</li>
</ol>
<p>Eclipse adds the following annotations to the field:</p>
<pre xml:space="preserve" class="oac_no_warn">
@OneToMany(targetEntity=<span class="italic">&lt;TARGET_ENTITY&gt;</span>)
@Column(name="<span class="italic">&lt;COLUMN&gt;</span>")


@OneToMany(targetEntity=<span class="italic">&lt;TARGET_ENTITY&gt;</span>.class, 
    =Type.<span class="italic">&lt;_TYPE&gt;</span>, 
    fetch = FetchType.<span class="italic">&lt;FETCH_TYPE&gt;</span>, 
    mappedBy = "<span class="italic">&lt;MAPPED_BY&gt;</span>"
)@OrderBy("<span class="italic">&lt;ORDER_BY&gt;</span>")
@JoinTable(name="<span class="italic">&lt;JOIN_TABLE_NAME&gt;</span>", joinColumns=@JoinColumn(name=
    "<span class="italic">&lt;JOIN_COLUMN_NAME&gt;</span>", referencedColumnName="<span class="italic">&lt;JOIN_COLUMN_REFERENCED_COLUMN&gt;</span>"), 
    inverseJoinColumns=@JoinColumn(name="<span class="italic">&lt;INVERSE_JOIN_COLUMN_NAME&gt;</span>", 
    referencedColumnName="<span class="italic">&lt;INVERSE_JOIN_COLUMN_REFERENCED_COLUMN&gt;</span>"))

</pre>
<a id="sthref263" name="sthref263"></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="sthref264" name="sthref264"></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="reference047.htm#CACIJEGI">Joining Strategy</a></p>
</li>
<li>
<p><a href="reference045.htm#CACJCHJB">Converters</a></p>
</li>
<li>
<p><a href="reference046.htm#CACBIJFD">Ordering</a></p>
</li>
</ul>
<a id="sthref265" name="sthref265"></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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