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| <div class="refsect1"> |
| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@Mutable</font></h2> |
| <p>Use <code>@Mutable</code> on a <code>@Basic</code> mapping to specify if the value of a complex field type can be <em>changed</em> (or not changed) instead of being <em>replaced</em>. Mutable mappings may affect the performance of change tracking; attribute change tracking can only be weaved with non-mutable mappings.</p> |
| <a id="sthref199" name="sthref199"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#CHDDHGFD">Table 2-33</a> describes this annotation's elements.</p> |
| <div class="tblhruleformalwide"><a id="TLJPA455" name="TLJPA455"></a><a id="sthref200" name="sthref200"></a><a id="CHDDHGFD" name="CHDDHGFD"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-33 @Mutable Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@Mutable 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="31%" /> |
| <col width="*" /> |
| <col width="28%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t43"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t43"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t43"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
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| <td align="left" id="r2c1-t43" headers="r1c1-t43"> |
| <p><code>boolean value</code></p> |
| </td> |
| <td align="left" headers="r2c1-t43 r1c2-t43"> |
| <p>(Optional) Specify if the mapping is mutable.</p> |
| </td> |
| <td align="left" headers="r2c1-t43 r1c3-t43"> |
| <p>true</p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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| <!-- class="tblhruleformalwide" --> |
| <a id="sthref201" name="sthref201"></a> |
| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>Most basic types (such as <code>int</code>, <code>long</code>, <code>float</code>, <code>double</code>, <code>String</code>, and <code>BigDecimal</code>) are not mutable.</p> |
| <p>By default, <code>Date</code> and <code>Calendar</code> types are assumed to be not mutable. To make these types mutable, use the <code>@Mutable</code> annotation. You can also use the global persistence property <code>eclipselink.temporal.mutable</code> to set the mappings as mutable.</p> |
| <p>By default, serialized types are assumed to be mutable. You can set the <code>@Mutable</code> annotation to <code>false</code> to make these types not mutable.</p> |
| <p>You can also configure mutable mappings for <code>Date</code> and <code>Calendar</code> fields in the persistence unit in the <code>persistence.xml</code> file.</p> |
| <a id="sthref202" name="sthref202"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#CHDDJJEE">Example 2-65</a> shows how to use the <code>@Mutable</code> annotation to specify <code>Employee</code> field <code>hireDate</code>.</p> |
| <div class="example"><a id="CHDDJJEE" name="CHDDJJEE"></a><a id="TLJPA456" name="TLJPA456"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-65 Using @Mutable Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| public class Employee implements Serializable { |
| |
| ... |
| |
| @Temporal(DATE) |
| <strong>@Mutable</strong> |
| public Calendar getHireDate() { |
| return hireDate; |
| } |
| |
| .. |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#CHDCDIBH">Example 2-66</a> shows how to configure mutable mappings in the persistence unit <code>persistence.xml</code> file or by importing a <code>property</code> map.</p> |
| <div class="example"><a id="CHDCDIBH" name="CHDCDIBH"></a><a id="TLJPA457" name="TLJPA457"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-66 Specifying Mutable Mappings in persistence.xml</font></em></strong></p> |
| <p>Using <code>persistence.xml</code> file:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <strong><property name="eclipselink.temporal.mutable" value="true"/></strong> |
| |
| </pre> |
| <p>Using <code>property</code> map:</p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| import org.eclipse.persistence.config.PersistenceUnitProperties; |
| propertiesMap.put(<strong>PersistenceUnitProperties.TEMPORAL_MUTABLE, "false"</strong>); |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref203" name="sthref203"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p><a href="annotations_ref.htm#CACFGAIC">"Mapping Annotations"</a></p> |
| </li> |
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