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<title>Primary Key Generation</title>
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<meta name="doctitle" content="Primary Key Generation" />
<meta name="relnum" content="Release 3.3" />
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<p><a id="CACCJJDC" name="CACCJJDC"></a></p>
<div class="sect3"><!-- infolevel="all" infotype="General" -->
<h1><a id="sthref502" name="sthref502"></a><a id="sthref503" name="sthref503"></a>Primary Key Generation</h1>
<p>Use the Primary Key Generation area in the <span class="gui-object-title">JPA Details</span> view to specify how to generate a primary key for a given entity.</p>
<div class="inftblhruleinformalwide">
<table class="HRuleInformalWide" title="JPA Details view, Primary key page" summary="JPA Details view, Primary key page" dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0">
<col width="16%" />
<col width="*" />
<col width="17%" />
<col width="25%" />
<thead>
<tr align="left" valign="top">
<th align="left" valign="bottom" id="r1c1-t31">Property</th>
<th align="left" valign="bottom" id="r1c2-t31">Description</th>
<th align="left" valign="bottom" id="r1c3-t31">Default</th>
<th align="left" valign="bottom" id="r1c4-t31">Available for Entity&nbsp;Type</th>
</tr>
</thead>
<tbody>
<tr align="left" valign="top">
<td align="left" id="r2c1-t31" headers="r1c1-t31">
<p><span class="bold">Table Generator</span></p>
</td>
<td align="left" headers="r2c1-t31 r1c2-t31">
<p>These fields define the database table used for generating the primary key and correspond to the <code>@TableGenerator</code> annotation.</p>
</td>
<td align="left" headers="r2c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r2c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r3c1-t31" headers="r1c1-t31">
<p>Name</p>
</td>
<td align="left" headers="r3c1-t31 r1c2-t31">
<p>Unique name of the generator.</p>
</td>
<td align="left" headers="r3c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r3c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r4c1-t31" headers="r1c1-t31">
<p>Table</p>
</td>
<td align="left" headers="r4c1-t31 r1c2-t31">
<p>Database table that stores the generated ID values.</p>
</td>
<td align="left" headers="r4c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r4c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r5c1-t31" headers="r1c1-t31">
<p>Schema</p>
</td>
<td align="left" headers="r5c1-t31 r1c2-t31">
<p>Database schema of the <span class="bold">Table</span>.</p>
</td>
<td align="left" headers="r5c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r5c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r6c1-t31" headers="r1c1-t31">
<p>Catalog</p>
</td>
<td align="left" headers="r6c1-t31 r1c2-t31">
<p>Database catalog of the <span class="bold">Table</span>.</p>
</td>
<td align="left" headers="r6c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r6c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r7c1-t31" headers="r1c1-t31">
<p>Primary key column</p>
</td>
<td align="left" headers="r7c1-t31 r1c2-t31">
<p>The column in the table generator's <span class="bold">Table</span> that contains the primary key.</p>
</td>
<td align="left" headers="r7c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r7c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r8c1-t31" headers="r1c1-t31">
<p>Value column</p>
</td>
<td align="left" headers="r8c1-t31 r1c2-t31">
<p>The column that stores the generated ID values.</p>
</td>
<td align="left" headers="r8c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r8c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r9c1-t31" headers="r1c1-t31">
<p>Allocation size</p>
</td>
<td align="left" headers="r9c1-t31 r1c2-t31">
<p>The value for the <span class="bold">Primary Key Column</span> in the generator table.</p>
</td>
<td align="left" headers="r9c1-t31 r1c3-t31">
<p>50</p>
</td>
<td align="left" headers="r9c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r10c1-t31" headers="r1c1-t31">
<p>Initial value</p>
</td>
<td align="left" headers="r10c1-t31 r1c2-t31">
<p>The starting value of the generated primary key.</p>
</td>
<td align="left" headers="r10c1-t31 r1c3-t31">
<p>0</p>
</td>
<td align="left" headers="r10c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r11c1-t31" headers="r1c1-t31">
<p><span class="bold">Sequence Generator</span></p>
</td>
<td align="left" headers="r11c1-t31 r1c2-t31">
<p><a id="sthref504" name="sthref504"></a><a id="sthref505" name="sthref505"></a>These fields define the specific sequence used for generating the primary key and correspond to the <code>@SequenceGenerator</code> annotation.</p>
<p>These fields apply only when <span class="bold">Strategy</span> = <span class="bold">Sequence</span>.</p>
</td>
<td align="left" headers="r11c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r11c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r12c1-t31" headers="r1c1-t31">
<p>Name</p>
</td>
<td align="left" headers="r12c1-t31 r1c2-t31">
<p>Name of the sequence table to use for defining primary key values.</p>
</td>
<td align="left" headers="r12c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r12c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r13c1-t31" headers="r1c1-t31">
<p>Sequence</p>
</td>
<td align="left" headers="r13c1-t31 r1c2-t31">
<p>Unique name of the sequence.</p>
</td>
<td align="left" headers="r13c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r13c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r14c1-t31" headers="r1c1-t31">
<p>Schema</p>
</td>
<td align="left" headers="r14c1-t31 r1c2-t31">
<p>Database schema of the <span class="bold">Sequence</span>.</p>
</td>
<td align="left" headers="r14c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r14c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r15c1-t31" headers="r1c1-t31">
<p>Catalog</p>
</td>
<td align="left" headers="r15c1-t31 r1c2-t31">
<p>Database catalog of the <span class="bold">Sequence</span>.</p>
</td>
<td align="left" headers="r15c1-t31 r1c3-t31"><br /></td>
<td align="left" headers="r15c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r16c1-t31" headers="r1c1-t31">
<p>Allocation size</p>
</td>
<td align="left" headers="r16c1-t31 r1c2-t31">
<p><a id="sthref506" name="sthref506"></a><a id="sthref507" name="sthref507"></a>These fields define the specific sequence used for generating the primary key and correspond to the <code>@SequenceGenerator</code> annotation.</p>
<p>These fields apply only when <span class="bold">Strategy</span> = <span class="bold">Sequence</span>.</p>
</td>
<td align="left" headers="r16c1-t31 r1c3-t31">
<p>50</p>
</td>
<td align="left" headers="r16c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
<tr align="left" valign="top">
<td align="left" id="r17c1-t31" headers="r1c1-t31">
<p>Initial value</p>
</td>
<td align="left" headers="r17c1-t31 r1c2-t31">
<p>The starting value of the generated primary key.</p>
</td>
<td align="left" headers="r17c1-t31 r1c3-t31">
<p>1</p>
</td>
<td align="left" headers="r17c1-t31 r1c4-t31">
<p><a href="tasks004.htm#BABGBIEE">Entity</a></p>
<br /></td>
</tr>
</tbody>
</table>
<br /></div>
<!-- class="inftblhruleinformalwide" -->
<a id="sthref508" name="sthref508"></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>
</ul>
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