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<title>Element Collection Mapping</title>
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<p class="betadraftsubtitle">Beta Draft: 2013-01-03</p>
<p><a id="CACBCGDI" name="CACBCGDI"></a></p>
<div class="sect3"><!-- infolevel="all" infotype="General" -->
<h1><a id="sthref549" name="sthref549"></a><a id="sthref550" name="sthref550"></a>Element Collection Mapping</h1>
<div class="inftblhruleinformal">
<table class="HRuleInformal" summary="JPA Details view, Version 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-t35">Property</th>
<th align="left" valign="bottom" id="r1c2-t35">Description</th>
<th align="left" valign="bottom" id="r1c3-t35">Default</th>
</tr>
</thead>
<tbody>
<tr align="left" valign="top">
<td align="left" id="r2c1-t35" headers="r1c1-t35">
<p>Target class</p>
</td>
<td align="left" headers="r2c1-t35 r1c2-t35">
<p>The class (basic or embeddable) that is the element type of the collection.</p>
</td>
<td align="left" headers="r2c1-t35 r1c3-t35"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r3c1-t35" headers="r1c1-t35">
<p>Fetch</p>
</td>
<td align="left" headers="r3c1-t35 r1c2-t35">
<p>Defines how data is loaded from the database:</p>
<ul>
<li>
<p>Eager &ndash; Data is loaded in before it is actually needed.</p>
</li>
<li>
<p>Lazy &ndash; Data is loaded only when required by the transaction.</p>
</li>
</ul>
</td>
<td align="left" headers="r3c1-t35 r1c3-t35">
<p>Lazy</p>
</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r4c1-t35" headers="r1c1-t35">
<p>Join fetch</p>
</td>
<td align="left" headers="r4c1-t35 r1c2-t35">
<p>The type of fetch to use:</p>
<ul>
<li>
<p>Inner &ndash; 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 &ndash; 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-t35 r1c3-t35">
<p>None</p>
</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r5c1-t35" headers="r1c1-t35">
<p><span class="bold">Collection Table</span></p>
</td>
<td align="left" headers="r5c1-t35 r1c2-t35"><br /></td>
<td align="left" headers="r5c1-t35 r1c3-t35"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r6c1-t35" headers="r1c1-t35">
<p>Name</p>
</td>
<td align="left" headers="r6c1-t35 r1c2-t35">
<p>Name of the database table used for the mapping.</p>
</td>
<td align="left" headers="r6c1-t35 r1c3-t35"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r7c1-t35" headers="r1c1-t35">
<p>Schema</p>
</td>
<td align="left" headers="r7c1-t35 r1c2-t35">
<p>Database schema of the <span class="bold">Collection Table</span>.</p>
</td>
<td align="left" headers="r7c1-t35 r1c3-t35"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r8c1-t35" headers="r1c1-t35">
<p>Catalog</p>
</td>
<td align="left" headers="r8c1-t35 r1c2-t35">
<p>Database Catalog of the <span class="bold">Collection Table</span>.</p>
</td>
<td align="left" headers="r8c1-t35 r1c3-t35"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r9c1-t35" headers="r1c1-t35">
<p><span class="bold">Join Columns</span></p>
</td>
<td align="left" headers="r9c1-t35 r1c2-t35"><br /></td>
<td align="left" headers="r9c1-t35 r1c3-t35"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r10c1-t35" headers="r1c1-t35">
<p>Override default</p>
</td>
<td align="left" headers="r10c1-t35 r1c2-t35">
<p>Click <span class="bold">Add</span> to create a new join column, by using the <a href="reference072.htm#CACJJBAD">Add Join Column dialog</a>.</p>
</td>
<td align="left" headers="r10c1-t35 r1c3-t35">
<p>0</p>
</td>
</tr>
</tbody>
</table>
<br /></div>
<!-- class="inftblhruleinformal" -->
<p>Element collection mappings also include the following areas:</p>
<ul>
<li>
<p><a href="reference044.htm#CACJBFEA">Value</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>
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