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<title>Primary Key Generation information</title>
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<meta name="doctitle" content="Primary Key Generation information" />
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<div class="sect3"><!-- infolevel="all" infotype="General" -->
<h1>Primary Key Generation information</h1>
<p>This table lists the fields available in the <span class="gui-object-title">Primary Key Generation</span> area in JPA Details view for <a href="tasks013.htm#BABGCBHG">ID mapping</a> types.</p>
<div class="inftblruleinformal">
<table class="RuleInformal" title="This table describes the options on the Join Columns tab." summary="This table describes the options on the Join Columns tab." dir="ltr" border="1" width="100%" frame="border" rules="all" cellpadding="3" cellspacing="0">
<col width="26%" />
<col width="*" />
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<thead>
<tr align="left" valign="top">
<th align="left" valign="bottom" id="r1c1-t19">Property</th>
<th align="left" valign="bottom" id="r1c2-t19">Description</th>
<th align="left" valign="bottom" id="r1c3-t19">Default</th>
</tr>
</thead>
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<tr align="left" valign="top">
<td align="left" id="r2c1-t19" headers="r1c1-t19"><a id="CACBAJBC" name="CACBAJBC"></a>Primary Key Generation</td>
<td align="left" headers="r2c1-t19 r1c2-t19"><a id="sthref251" name="sthref251"></a><a id="sthref252" name="sthref252"></a>These fields define how the primary key is generated. These fields correspond to the <code>@GeneratedValue</code> annotation.</td>
<td align="left" headers="r2c1-t19 r1c3-t19">Generated Value</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r3c1-t19" headers="r1c1-t19"><a id="CACJEEEC" name="CACJEEEC"></a>&nbsp;&nbsp;&nbsp;Strategy</td>
<td align="left" headers="r3c1-t19 r1c2-t19">
<ul>
<li>Auto</li>
<li>
<p>Identity &ndash; Values are assigned by the database's <span class="bold">Identity</span> column.</p>
</li>
<li>
<p>Sequence &ndash; Values are assigned by a sequence table (see <a href="#CACFFHEH">Sequence&nbsp;Generator</a>).</p>
</li>
<li>
<p>Table &ndash; Values are assigned by a database table (see <a href="#CACGFEAH">Table Generator</a>).</p>
</li>
</ul>
</td>
<td align="left" headers="r3c1-t19 r1c3-t19">Auto</td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r4c1-t19" headers="r1c1-t19"><a id="BABEEAHJ" name="BABEEAHJ"></a>&nbsp;&nbsp;Generator Name</td>
<td align="left" headers="r4c1-t19 r1c2-t19">Unique name of the generated value.</td>
<td align="left" headers="r4c1-t19 r1c3-t19"><br /></td>
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<tr align="left" valign="top">
<td align="left" id="r5c1-t19" headers="r1c1-t19"><a id="CACGFEAH" name="CACGFEAH"></a>Table Generator</td>
<td align="left" headers="r5c1-t19 r1c2-t19">These fields define the database table used for generating the primary key and correspond to the <code>@TableGenerator</code> annotation.
<p>These fields apply only when <span class="bold">Strategy</span>&nbsp;=&nbsp;<span class="bold">Table</span>.</p>
</td>
<td align="left" headers="r5c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r6c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Name</td>
<td align="left" headers="r6c1-t19 r1c2-t19">Unique name of the generator.</td>
<td align="left" headers="r6c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r7c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Table</td>
<td align="left" headers="r7c1-t19 r1c2-t19">Database table that stores the generated ID values.</td>
<td align="left" headers="r7c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r8c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Primary Key Column</td>
<td align="left" headers="r8c1-t19 r1c2-t19">The column in the table generator's <span class="bold">Table</span> that contains the primary key.</td>
<td align="left" headers="r8c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r9c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Value Column</td>
<td align="left" headers="r9c1-t19 r1c2-t19">The column that stores the generated ID values.</td>
<td align="left" headers="r9c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r10c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Primary Key Column Value</td>
<td align="left" headers="r10c1-t19 r1c2-t19">The value for the <span class="bold">Primary Key Column</span> in the generator table.</td>
<td align="left" headers="r10c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r11c1-t19" headers="r1c1-t19"><a id="CACFFHEH" name="CACFFHEH"></a>Sequence&nbsp;Generator</td>
<td align="left" headers="r11c1-t19 r1c2-t19"><a id="sthref253" name="sthref253"></a><a id="sthref254" name="sthref254"></a>These fields define the specific sequence used for generating the primary key and correspond to the <code>@SequenceGenerator</code> annotation.
<p>These fields apply only when <span class="bold">Strategy</span> = <span class="bold">Sequence</span>.</p>
</td>
<td align="left" headers="r11c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r12c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Name</td>
<td align="left" headers="r12c1-t19 r1c2-t19">Name of the sequence table to use for defining primary key values.</td>
<td align="left" headers="r12c1-t19 r1c3-t19"><br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r13c1-t19" headers="r1c1-t19">&nbsp;&nbsp;Sequence</td>
<td align="left" headers="r13c1-t19 r1c2-t19">Unique name of the sequence.</td>
<td align="left" headers="r13c1-t19 r1c3-t19"><br /></td>
</tr>
</tbody>
</table>
<br /></div>
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<p>&nbsp;</p>
<img src="img/ngrelt.png" alt="Related task" title="Related task" /><br />
<br />
<a href="tasks013.htm#BABGCBHG">ID mapping</a>
<p>&nbsp;</p>
<img src="img/ngrelr.png" alt="Related task" title="Related task" /><br />
<br />
<a href="ref_persistence_map_view.htm#BABIFBAF">JPA Details view (for attributes)</a></div>
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