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<title>One-to-one mapping</title>
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<meta name="doctitle" content="One-to-one mapping" />
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<p class="betadraftsubtitle">Beta Draft: 2013-01-03</p>
<p><a id="BABFHBCJ" name="BABFHBCJ"></a></p>
<div class="sect2"><!-- infolevel="all" infotype="General" -->
<h1>One-to-one mapping</h1>
<p><a id="sthref266" name="sthref266"></a><a id="sthref267" name="sthref267"></a><a id="sthref268" name="sthref268"></a><a id="sthref269" name="sthref269"></a>Use a <span class="bold">One-to-One 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-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="sthref270" name="sthref270"></a>
<p class="titleinfigure">JPA Details, One-to-one Mapping</p>
<img src="img/jpa_details_onetoone.png" alt="JPA Details, One-to-one Mapping" title="JPA Details, One-to-one Mapping" /><br /></div>
<!-- class="figure" --></li>
<li>
<p>Complete each field in the <a href="reference041.htm#CACGGHDD">One-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>
<ul>
<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>
</li>
</ol>
<p>Eclipse adds the following annotations to the field:</p>
<pre xml:space="preserve" class="oac_no_warn">
@OneToOne(targetEntity=<span class="italic">&lt;TARGET_ENTITY&gt;</span>, =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>")
@JoinColumn(name="<span class="italic">&lt;JOIN_COLUMN_NAME&gt;</span>", referencedColumnName=
    "<span class="italic">&lt;JOIN_COLUMN_REFERENCED_COLUMN&gt;</span>", insertable = <span class="italic">&lt;INSERTABLE&gt;</span>, 
    updatable = <span class="italic">&lt;UPDATABLE&gt;</span>)
</pre>
<a id="sthref271" name="sthref271"></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="sthref272" name="sthref272"></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>
<a id="sthref273" name="sthref273"></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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