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| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@UuidGenerator</font></h2> |
| <p>Use <code>@UuidGenerator</code> to defines a primary key generator that may be referenced by name when a generator element is specified for the <code>@GeneratedValue</code> annotation. A UUID (universally unique identifier) generator may be specified on the entity class or on the primary key field or property.</p> |
| <p>The generator name is global to the persistence unit (that is, across all generator types).</p> |
| <a id="sthref422" name="sthref422"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#CFAIAHJG">Table 2-74</a> describes this annotation's elements.</p> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-74 @UuidGenerator Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@UuidGenerator Annotation Elements" summary="This table describes this annotation’s elements." dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
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| <th align="left" valign="bottom" id="r1c1-t91"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t91"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t91"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
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| <p><code>name</code></p> |
| </td> |
| <td align="left" headers="r2c1-t91 r1c2-t91"> |
| <p>Name of the UUID generator, must be unique for the persistence unit</p> |
| </td> |
| <td align="left" headers="r2c1-t91 r1c3-t91"><br /></td> |
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| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#CFADJAIF">Example 2-119</a> shows how to use this annotation.</p> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-119 Using @UuidGenerator Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| <strong>@UuidGenerator(name="EMP_ID_GEN")</strong> |
| public class Employee { |
| @Id |
| @GeneratedValue(generator="EMP_ID_GEN") |
| private String id; |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p>You can also specify the <code>SessionCustomizer</code> and configure the named sequence in your <code>eclipselink-orm.xml</code> file, as shown in <a href="#CFAGEJHJ">Example 2-120</a>.</p> |
| <div class="example"><a id="CFAGEJHJ" name="CFAGEJHJ"></a><a id="TLJPA581" name="TLJPA581"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-120 Using <generated-value> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <id name="id"> |
| <column name="PROJ_ID" /> |
| <<strong>generated-value</strong> generator="system-uuid"/> |
| </id> |
| </pre></div> |
| <!-- class="example" --> |
| <p>You can also specify the named sequence at the persistence unit level (in the <code>persistence.xml</code> file) as shown in <a href="#CFAJEEEJ">Example 2-121</a>.</p> |
| <div class="example"><a id="CFAJEEEJ" name="CFAJEEEJ"></a><a id="TLJPA582" name="TLJPA582"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-121 Specifying Generator in persistence.xml</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <property name="eclipselink.session.customizer" value="eclipselink.example.UUIDSequence"/> |
| |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref425" name="sthref425"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p>@Generated Value<br /> |
| <code><a href="http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/GeneratedValue">http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/GeneratedValue</a></code></p> |
| </li> |
| <li> |
| <p><a href="annotations_ref.htm#CACGCEIJ">"Entity Annotations"</a></p> |
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