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| <b>Release 2.5</b><br /></font></td> |
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| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@ReadTransformer</font></h2> |
| <p>Use <code>@ReadTransformer</code> with Transformation mappings to define the transformation of the database column values into attribute values (unless the mapping is write-only).</p> |
| <a id="sthref336" name="sthref336"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#CHDGCGID">Table 2-59</a> describes this annotation's elements.</p> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-59 @ReadTransformer Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@ReadTransformer 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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| <col width="*" /> |
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| <th align="left" valign="bottom" id="r1c1-t71"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t71"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t71"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
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| <p><code>method</code></p> |
| </td> |
| <td align="left" headers="r2c1-t71 r1c2-t71"> |
| <p>The mapped class must have a method with this name which returns a value to be assigned to the attribute (not assigns the value to the attribute).</p> |
| </td> |
| <td align="left" headers="r2c1-t71 r1c3-t71"><br /></td> |
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| <p>transformerClass</p> |
| </td> |
| <td align="left" headers="r3c1-t71 r1c2-t71"> |
| <p>User-defined class that implements the <code>org.eclipse.persistence.mappings.transformers.AttributeTransformer</code> interface.</p> |
| <p>The class will be instantiated, its <code>buildAttributeValue</code> will be used to create the value to be assigned to the attribute.</p> |
| </td> |
| <td align="left" headers="r3c1-t71 r1c3-t71"> |
| <p><code>void.class</code></p> |
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| <p class="note"><img src="../../../dcommon/images/note_icon.png" width="16" height="16" alt="Note" style="vertical-align:middle;padding-right:5px;" />Note:</p> |
| <p>You must specify <strong>either</strong> a <code>method</code> or <code>transformerClass</code>, but not both.</p> |
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| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>Also unless it's a read-only mapping, either <code>@WriteTransformer</code> annotation or <code>@WriteTransformers</code> annotation should be specified. Each <code>WriteTransformer</code> defines transformation of the attribute value to a single database column value (column is specified in the <code>WriteTransformer</code>).</p> |
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| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p>See <a href="a_transformation.htm#BABHECGF">"Using @Transformation Annotation"</a> for an example of how to use the <code>@WriteTransformer annotation</code> with a Transformation mapping.</p> |
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| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p><a href="a_transformation.htm#BABCJGIG">"@Transformation"</a>.</p> |
| </li> |
| <li> |
| <p><a href="a_writetransformer.htm#BGBGGAEA">"@WriteTransformer"</a></p> |
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