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<title>Inheritance</title>
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<meta name="doctitle" content="Inheritance" />
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<p class="betadraftsubtitle">Beta Draft: 2013-01-03</p>
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<div class="sect3"><!-- infolevel="all" infotype="General" -->
<h1>Inheritance</h1>
<p><a id="sthref488" name="sthref488"></a><a id="sthref489" name="sthref489"></a>This table lists the fields available on the <span class="gui-object-title">Inheritance</span> area in the <span class="gui-object-title">JPA Details</span> view for each entity type.</p>
<div class="inftblhruleinformal">
<table class="HRuleInformal" title="This table describes the options on the Persistence Properties view, Inheritance tab." summary="This table describes the options on the Persistence Properties view, Inheritance tab." dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0">
<col width="16%" />
<col width="*" />
<col width="15%" />
<col width="20%" />
<thead>
<tr align="left" valign="top">
<th align="left" valign="bottom" id="r1c1-t28">Property</th>
<th align="left" valign="bottom" id="r1c2-t28">Description</th>
<th align="left" valign="bottom" id="r1c3-t28">Default</th>
<th align="left" valign="bottom" id="r1c4-t28">Available for Entity Type</th>
</tr>
</thead>
<tbody>
<tr align="left" valign="top">
<td align="left" id="r2c1-t28" headers="r1c1-t28">
<p>Strategy</p>
</td>
<td align="left" headers="r2c1-t28 r1c2-t28">
<p>Specify the strategy to use when mapping a class or class hierarchy:</p>
<ul>
<li>
<p><span class="bold">Single table</span> – All classes in the hierarchy are mapped to a single table.</p>
</li>
<li>
<p><span class="bold">Joined</span> – The root of the hierarchy is mapped to a single table; each child maps to its own table.</p>
</li>
<li>
<p><span class="bold">Table per class</span> – Each class is mapped to a separate table.</p>
</li>
</ul>
<p>This field corresponds to the <code>@Inheritance</code> annotation.</p>
</td>
<td align="left" headers="r2c1-t28 r1c3-t28">
<p>Single table</p>
</td>
<td align="left" headers="r2c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r3c1-t28" headers="r1c1-t28">
<p><a id="sthref490" name="sthref490"></a><a id="sthref491" name="sthref491"></a>Discriminator Value</p>
</td>
<td align="left" headers="r3c1-t28 r1c2-t28">
<p>Specify the discriminator value used to differentiate an entity in this inheritance hierarchy. The value must conform to the specified <span class="bold">Discriminator Type</span>.</p>
</td>
<td align="left" headers="r3c1-t28 r1c3-t28"><br /></td>
<td align="left" headers="r3c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r4c1-t28" headers="r1c1-t28">
<p><a id="sthref492" name="sthref492"></a><a id="sthref493" name="sthref493"></a><span class="bold">Discriminator Column</span></p>
</td>
<td align="left" headers="r4c1-t28 r1c2-t28">
<p>These fields are available when using a <span class="bold">Single</span> or <span class="bold">Joined</span> inheritance strategy.</p>
<p>This field corresponds to the <code>@DiscriminatorColumn</code> annotation.</p>
<p>Use the <span class="bold">Details</span> area to define the <span class="bold">Length</span> and <span class="bold">Column definition</span> of this Discriminator Column.</p>
</td>
<td align="left" headers="r4c1-t28 r1c3-t28"><br /></td>
<td align="left" headers="r4c1-t28 r1c4-t28"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r5c1-t28" headers="r1c1-t28">
<p>Name</p>
</td>
<td align="left" headers="r5c1-t28 r1c2-t28">
<p>Name of the discriminator column</p>
</td>
<td align="left" headers="r5c1-t28 r1c3-t28"><br /></td>
<td align="left" headers="r5c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r6c1-t28" headers="r1c1-t28">
<p>Type</p>
</td>
<td align="left" headers="r6c1-t28 r1c2-t28">
<p>Set this field to set the discriminator type to <code>Char</code> or <code>Integer</code> (instead of its default: <code>String</code>). The <span class="bold">Discriminator Value</span> must conform to this type.</p>
</td>
<td align="left" headers="r6c1-t28 r1c3-t28">
<p>String</p>
</td>
<td align="left" headers="r6c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r7c1-t28" headers="r1c1-t28">
<p>Length</p>
</td>
<td align="left" headers="r7c1-t28 r1c2-t28">
<p>The column length for String-based discriminator types.</p>
</td>
<td align="left" headers="r7c1-t28 r1c3-t28">
<p>0</p>
</td>
<td align="left" headers="r7c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r8c1-t28" headers="r1c1-t28">
<p>Column definition</p>
</td>
<td align="left" headers="r8c1-t28 r1c2-t28">
<p>The SQL fragment that is used when generating the DDL for the discriminator column.</p>
</td>
<td align="left" headers="r8c1-t28 r1c3-t28"><br /></td>
<td align="left" headers="r8c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r9c1-t28" headers="r1c1-t28">
<p><span class="bold">Primary Key Join Columns</span></p>
</td>
<td align="left" headers="r9c1-t28 r1c2-t28">
<p>Use to override the default primary key join columns. Select <span class="bold">Override Default</span>, then click <span class="bold">Add</span> to select new Join Column with the <a href="reference077.htm#CACDGGDB">Add Primary Key Join Column dialog</a>.</p>
<p>This field corresponds with @<code>PrimaryKeyJoinColum</code>n annotation.</p>
</td>
<td align="left" headers="r9c1-t28 r1c3-t28"><br /></td>
<td align="left" headers="r9c1-t28 r1c4-t28">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
</tbody>
</table>
<br /></div>
<!-- class="inftblhruleinformal" -->
<p>Refer to <a href="task_inheritance.htm#CIHCCCJD">"Specifying entity inheritance"</a> for additional information.</p>
<a id="sthref494" name="sthref494"></a>
<p class="subhead2">Related tasks</p>
<ul>
<li>
<p><a href="task_inheritance.htm#CIHCCCJD">Specifying entity inheritance</a></p>
</li>
<li>
<p><a href="task_add_persistence.htm#BABHICAI">Adding persistence to a class</a></p>
</li>
</ul>
<a id="sthref495" name="sthref495"></a>
<p class="subhead2">Related reference</p>
<ul>
<li>
<p><a href="ref_persistence_prop_view.htm#BABFAEBB">JPA Details view (for entities)</a></p>
</li>
<li>
<p><a href="reference077.htm#CACDGGDB">Add Primary Key Join Column dialog</a></p>
</li>
</ul>
</div>
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