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<title>Many-to-one mapping</title>
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<p><a id="BABHFAFJ" name="BABHFAFJ"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>Many-to-one mapping</h1>
<p><a id="sthref250" name="sthref250"></a><a id="sthref251" name="sthref251"></a><a id="sthref252" name="sthref252"></a><a id="sthref253" name="sthref253"></a>Use a <span class="bold">Many-to-One</span> mapping to defines a single-valued association to another entity class that has many-to-one 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 > Many-to-One</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="sthref254" name="sthref254"></a>
<p class="titleinfigure">JPA Details, Many-to-one mapping</p>
<img src="img/jpa_details_manytoone.png" alt="JPA Details, Many-to-one mapping" title="JPA Details, Many-to-one mapping" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Complete each field in the <a href="reference039.htm#CACHAEDB">Many-to-One 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">
@JoinTable(joinColumns=@JoinColumn(name="<span class="italic"><JOIN_COLUMN></span>"),
name = "<span class="italic"><JOIN_TABLE_NAME></span>")
@ManyToOne(
targetEntity=<span class="italic"><TARGET_ENTITY></span>,
fetch=<span class="italic"><FETCH_TYPE></span>,
=<span class="italic"><_TYPE></span>
)
</pre>
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<p class="subhead2">Related tasks</p>
<ul>
<li>
<p><a href="task_mapping.htm#BABDGBIJ">Mapping an entity</a></p>
</li>
</ul>
<a id="sthref256" name="sthref256"></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="reference048.htm#CACGHHGB">Derived Identity</a></p>
</li>
</ul>
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<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>
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