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| <div class="refsect1"> |
| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@Transformation</font></h2> |
| <p>Use <code>@Transformation</code> with a Transformation mapping to define the transformation of database columns into attribute values (unless the Transformation mapping is write-only, in which case it should have a <code>@ReadTransformer</code> annotation).</p> |
| <a id="sthref406" name="sthref406"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#BABFBEDA">Table 2-71</a> describes this annotation's elements.</p> |
| <div class="tblhruleformalwide"><a id="TLJPA568" name="TLJPA568"></a><a id="sthref407" name="sthref407"></a><a id="BABFBEDA" name="BABFBEDA"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-71 @Transformation Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@Transformation 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="21%" /> |
| <col width="*" /> |
| <col width="9%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t88"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t88"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t88"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
| </tr> |
| </thead> |
| <tbody> |
| <tr align="left" valign="top"> |
| <td align="left" id="r2c1-t88" headers="r1c1-t88"> |
| <p><code>fetch</code></p> |
| </td> |
| <td align="left" headers="r2c1-t88 r1c2-t88"> |
| <p>(Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched.</p> |
| <ul> |
| <li> |
| <p>The <code>EAGER</code> strategy is a requirement on the persistence provider runtime that the value must be eagerly fetched.</p> |
| </li> |
| <li> |
| <p>The <code>LAZY</code> strategy is a hint to the persistence provider runtime.</p> |
| </li> |
| </ul> |
| </td> |
| <td align="left" headers="r2c1-t88 r1c3-t88"> |
| <p><code>EAGER</code></p> |
| </td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t88" headers="r1c1-t88"> |
| <p><code>optional</code></p> |
| </td> |
| <td align="left" headers="r3c1-t88 r1c2-t88"> |
| <p>(Optional) A hint as to whether the value of the field or property may be <code>null</code>. It is disregarded for primitive types, which are considered non-optional.</p> |
| </td> |
| <td align="left" headers="r3c1-t88 r1c3-t88"> |
| <p><code>true</code></p> |
| </td> |
| </tr> |
| </tbody> |
| </table> |
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| <!-- class="tblhruleformalwide" --> |
| <a id="sthref408" name="sthref408"></a> |
| <p><strong><br /><span class="refsubsect">Usage</span></strong></p> |
| <p>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> |
| <a id="sthref409" name="sthref409"></a> |
| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#BABHECGF">Example 2-114</a> shows how to use the <code>@Transformation</code> annotation.</p> |
| <div class="example"><a id="BABHECGF" name="BABHECGF"></a><a id="TLJPA569" name="TLJPA569"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-114 Using @Transformation Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <strong>@Transformation(fetch=FecthType.LAZY, optional="true")</strong> |
| @ReadTransformer(class=package.MyNormalHoursTransformer.class) |
| @WriteTranformers({ |
| @WriteTranformer(column=@Column(name="START_TIME"), |
| method="getStartDate"), |
| @WriteTranformer(column=@Column(name="END_TIME"), |
| class=package.MyTimeTransformer.class) |
| }) |
| @Mutable |
| @ReturnUpdate |
| @Access(AccessType.PROPERTY) |
| @AccessMethods(get="getNormalHours", set="setNormalHours") |
| @Properties({ |
| @Property(name="x", value="y") |
| }) |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#BABHCBAG">Example 2-115</a> shows the same mapping, using the <code><transformation></code> XML element in the <code>eclipselink-orm.xml</code> file.</p> |
| <div class="example"><a id="BABHCBAG" name="BABHCBAG"></a><a id="TLJPA570" name="TLJPA570"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-115 Using <transformation> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <strong><transformation name="normalHours" fetch="LAZY" optional="true"></strong> |
| <read-transformer method="buildNormalHours"/> |
| <write-transformer method="getStartTime"> |
| <column name="START_TIME"/> |
| </write-transformer> |
| <write-transformer class="package.MyTimeTransformer"> |
| <column name="END_TIME"/> |
| </write-transformer> |
| <mutable/> |
| <return-update/> |
| <access type="PROPERTY"/> |
| <access-methods get="getNormalHours" set="setNormalHours"/> |
| <properties> |
| <property name="x" value="y"/> |
| </properties> |
| <strong></transformation></strong> |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref410" name="sthref410"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p><a href="a_writetransformer.htm#BGBGGAEA">"@WriteTransformer"</a></p> |
| </li> |
| <li> |
| <p><a href="a_readtransformer.htm#CHDGHHBA">"@ReadTransformer"</a></p> |
| </li> |
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