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| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@PrimaryKey</font></h2> |
| <p>Use <code>@PrimaryKey</code> to allow advanced configuration of the ID.</p> |
| <p>A validation policy can be given that allows specifying if zero is a valid ID value. The set of primary key columns can also be specified precisely.</p> |
| <a id="sthref298" name="sthref298"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#BGEBGEAB">Table 2-53</a> describes this annotation's elements.</p> |
| <div class="tblhruleformalwide"><a id="TLJPA504" name="TLJPA504"></a><a id="sthref299" name="sthref299"></a><a id="BGEBGEAB" name="BGEBGEAB"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-53 @PrimaryKey Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@PrimaryKey Annotation Elements" summary="This table describes this annotation’s elements." dir="ltr" border="1" width="100%" frame="hsides" rules="rows" cellpadding="3" cellspacing="0"> |
| <col width="23%" /> |
| <col width="*" /> |
| <col width="20%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t63"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t63"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t63"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t63" headers="r1c1-t63"> |
| <p><code>cacheKeyType</code></p> |
| </td> |
| <td align="left" headers="r2c1-t63 r1c2-t63"> |
| <p>(Optional) Configures the cache key type to store the object in the cache.</p> |
| </td> |
| <td align="left" headers="r2c1-t63 r1c3-t63"> |
| <p><code>AUTO</code></p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t63" headers="r1c1-t63"> |
| <p><code>columns</code></p> |
| </td> |
| <td align="left" headers="r3c1-t63 r1c2-t63"> |
| <p>(Optional) Directly specify the primary key columns. This can be used instead of <code>@Id</code> if the primary key includes a non basic field, such as a foreign key, or a inheritance discriminator, embedded, or transformation mapped field.</p> |
| </td> |
| <td align="left" headers="r3c1-t63 r1c3-t63"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r4c1-t63" headers="r1c1-t63"> |
| <p><code>validation</code></p> |
| </td> |
| <td align="left" headers="r4c1-t63 r1c2-t63"> |
| <p>(Optional) Configures what ID validation is done:</p> |
| <ul> |
| <li> |
| <p><code>NULL</code> – EclipseLink interprets zero values as zero. This permits primary keys to use a value of zero.</p> |
| </li> |
| <li> |
| <p><code>ZERO</code> (default) – EclipseLink interprets zero as null.</p> |
| </li> |
| <li> |
| <p><code>NEGATIVE</code> – EclipseLink interprets negative values as null.</p> |
| </li> |
| <li> |
| <p><code>NONE</code> – EclipseLink does not validate the ID value.</p> |
| </li> |
| </ul> |
| <p>By default <code>0</code> is not a valid ID value, this can be used to allow 0 ID values.</p> |
| </td> |
| <td align="left" headers="r4c1-t63 r1c3-t63"> |
| <p><code>ZERO</code></p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
| <br /></div> |
| <!-- class="tblhruleformalwide" --> |
| <a id="sthref300" name="sthref300"></a> |
| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>By default, EclipseLink interprets zero as <code>null</code> for primitive types that cannot be null (such as <code>int</code> and <code>long</code>), causing zero to be an invalid value for primary keys. You can modify this setting by using the <code>@PrimaryKey</code> annotation to configure an <code>IdValidation</code> for an entity class. Use the <code>eclipselink.<a href="p_id_validation.htm#CACEEGCC">id-validation</a></code> property to configure an <code>IdValidation</code> for the entire persistence unit.</p> |
| <p>Setting the <code>validation</code> element also affects how EclipseLink generates IDs: new IDs are generated only for IDs that are not valid (<code>null</code> or <code>0</code>, by default); setting to <code>NONE</code> disables ID generation.</p> |
| <a id="sthref301" name="sthref301"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#BGEJFGAG">Example 2-91</a> shows how to use this annotation.</p> |
| <div class="example"><a id="BGEJFGAG" name="BGEJFGAG"></a><a id="TLJPA505" name="TLJPA505"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-91 Using @PrimaryKey Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <strong>@PrimaryKey(validation=IdValidation.ZERO)</strong> |
| public class Employee implements Serializable, Cloneable { |
| ... |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#BGEGDFHI">Example 2-92</a> shows how to use the <code><primary-key></code> element in your <code>eclipselink-orm.xml</code> file.</p> |
| <div class="example"><a id="BGEGDFHI" name="BGEGDFHI"></a><a id="TLJPA506" name="TLJPA506"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-92 Using @<primary-key> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <entity name="Employee" class="foo.Employee" access="PROPERTY"> |
| <strong><primary-key validation="ZERO"/</strong>> |
| ... |
| </entity> |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref302" name="sthref302"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p>"@Id"<br /> |
| <code><a href="http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/Id">http://wiki.eclipse.org/EclipseLink/UserGuide/JPA/Basic_JPA_Development/Entities/Ids/Id</a></code></p> |
| </li> |
| <li> |
| <p><a href="p_id_validation.htm#CACEEGCC">"id-validation"</a></p> |
| </li> |
| <li> |
| <p><a href="annotations_ref.htm#CACGCEIJ">"Entity Annotations"</a></p> |
| </li> |
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