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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><a id="CACGGHDD" name="CACGGHDD"></a></p>
<div class="sect3"><!-- infolevel="all" infotype="General" -->
<h1><a id="sthref564" name="sthref564"></a><a id="sthref565" name="sthref565"></a><a id="sthref566" name="sthref566"></a>One-to-One Mapping</h1>
<div class="inftblhruleinformal">
<table class="HRuleInformal" summary="JPA Details view, One-to-one page" dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0">
<col width="29%" />
<col width="*" />
<col width="24%" />
<thead>
<tr align="left" valign="top">
<th align="left" valign="bottom" id="r1c1-t40">Property</th>
<th align="left" valign="bottom" id="r1c2-t40">Description</th>
<th align="left" valign="bottom" id="r1c3-t40">Default</th>
</tr>
</thead>
<tbody>
<tr align="left" valign="top">
<td align="left" id="r2c1-t40" headers="r1c1-t40">
<p>Target entity</p>
</td>
<td align="left" headers="r2c1-t40 r1c2-t40">
<p>The persistent entity to which the attribute is mapped.</p>
</td>
<td align="left" headers="r2c1-t40 r1c3-t40"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r3c1-t40" headers="r1c1-t40">
<p>Fetch</p>
</td>
<td align="left" headers="r3c1-t40 r1c2-t40">
<p>Defines how data is loaded from the database:</p>
<ul>
<li>
<p>Eager – Data is loaded in before it is actually needed.</p>
</li>
<li>
<p>Lazy – Data is loaded only when required by the transaction.</p>
</li>
</ul>
</td>
<td align="left" headers="r3c1-t40 r1c3-t40">
<p>Eager</p>
</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r4c1-t40" headers="r1c1-t40">
<p>Join fetch</p>
</td>
<td align="left" headers="r4c1-t40 r1c2-t40">
<p>The type of fetch to use:</p>
<ul>
<li>
<p>Inner – Provides the inner join fetching of the related object.</p>
<p><span class="bold">Note</span>: Inner joining does not allow for null or empty values</p>
</li>
<li>
<p>Outer – Provides the outer join fetching of the related object</p>
<p><span class="bold">Note</span>: Outer joining allows for null or empty values.</p>
</li>
</ul>
</td>
<td align="left" headers="r4c1-t40 r1c3-t40"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r5c1-t40" headers="r1c1-t40">
<p>Optional</p>
</td>
<td align="left" headers="r5c1-t40 r1c2-t40">
<p>Specifies if this field is can be null.</p>
</td>
<td align="left" headers="r5c1-t40 r1c3-t40">
<p>True</p>
</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r6c1-t40" headers="r1c1-t40">
<p>Private owned</p>
</td>
<td align="left" headers="r6c1-t40 r1c2-t40">
<p>Specify that a relationship is privately owned; target object is a dependent part of the source object and is not referenced by any other object and cannot exist on its own.</p>
</td>
<td align="left" headers="r6c1-t40 r1c3-t40">
<p>False</p>
</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r7c1-t40" headers="r1c1-t40">
<p>Orphan removal</p>
</td>
<td align="left" headers="r7c1-t40 r1c2-t40"><br /></td>
<td align="left" headers="r7c1-t40 r1c3-t40">
<p>False</p>
</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r8c1-t40" headers="r1c1-t40">
<p>Cascade</p>
</td>
<td align="left" headers="r8c1-t40 r1c2-t40">
<p>Specify which operations are propagated throughout the entity.</p>
<ul>
<li>
<p>All – All operations</p>
</li>
<li>
<p>Persist</p>
</li>
<li>
<p>Merge</p>
</li>
<li>
<p>Move</p>
</li>
<li>
<p>Remove</p>
</li>
<li>
<p>Refresh</p>
</li>
</ul>
</td>
<td align="left" headers="r8c1-t40 r1c3-t40">
<p>True</p>
</td>
</tr>
</tbody>
</table>
<br /></div>
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<p>One-to-one mappings also include the following areas:</p>
<ul>
<li>
<p><a href="reference048.htm#CACGHHGB">Derived Identity</a></p>
</li>
<li>
<p><a href="reference047.htm#CACIJEGI">Joining Strategy</a></p>
</li>
</ul>
</div>
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