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| <h2 title="Annotation Type FetchAttribute" class="title">Annotation Type FetchAttribute</h2> |
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| <pre><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Target.html?is-external=true" title="class or interface in java.lang.annotation">@Target</a>(<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/Target.html?is-external=true#value--" title="class or interface in java.lang.annotation">value</a>={}) |
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| public @interface <span class="memberNameLabel">FetchAttribute</span></pre> |
| <div class="block">A fetch attribute is specified within a fetch group and is used as a |
| performance enhancement that allows a group of attributes of an object to be |
| loaded on demand, which means that the data for an attribute might not loaded |
| from the underlying data source until an explicit access call for the |
| attribute first occurs. It avoids the wasteful practice of loading up all |
| data of the object's attributes, in which the user is interested in only |
| partial of them. |
| |
| A great deal of caution and careful system use case analysis should be use |
| when using the fetch group feature, as the extra round-trip would well offset |
| the gain from the deferred loading in many cases. |
| |
| EclipseLink fetch group support is twofold: the pre-defined fetch groups at |
| the Entity or MappedSuperclass level; and dynamic (use case) fetch groups at |
| the query level.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>Guy Pelletier</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>EclipseLink 2.1</dd> |
| </dl> |
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| <h3>Required Element Summary</h3> |
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| <caption><span>Required Elements</span><span class="tabEnd"> </span></caption> |
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| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Required Element and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code><a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/FetchAttribute.html#name--">name</a></span></code> |
| <div class="block">(Required) The fetch attribute name.</div> |
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| <h4>name</h4> |
| <pre>public abstract <a href="https://docs.oracle.com/javase/8/docs/api/java/lang/String.html?is-external=true" title="class or interface in java.lang">String</a> name</pre> |
| <div class="block">(Required) The fetch attribute name.</div> |
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