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<div class="subTitle">org.eclipse.persistence.annotations</div>
<h2 title="Annotation Type CacheIndex" class="title">Annotation Type CacheIndex</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>={<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#METHOD" title="class or interface in java.lang.annotation">METHOD</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#FIELD" title="class or interface in java.lang.annotation">FIELD</a>,<a href="https://docs.oracle.com/javase/8/docs/api/java/lang/annotation/ElementType.html?is-external=true#TYPE" title="class or interface in java.lang.annotation">TYPE</a>})
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public @interface <span class="memberNameLabel">CacheIndex</span></pre>
<div class="block">Allow a cache index to be define.
A cache index allow singleResult queries to obtain a cache hit when querying on the indexed fields.
resultList queries cannot obtain cache hits, as it is unknown if all of the objects are in memory,
(unless the cache usage query hint is used).
The index should be unique, but if not unique, the first indexed object will be returned.
Cache indexes are only relevant when caching is enabled.
The @CacheIndex can be defined on a Entity class, or on an attribute.
The column is defaulted when defined on a attribute.</div>
<dl>
<dt><span class="simpleTagLabel">Author:</span></dt>
<dd>James Sutherland</dd>
<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>EclipseLink 2.4</dd>
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<th class="colFirst" scope="col">Modifier and Type</th>
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<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/CacheIndex.html#columnNames--">columnNames</a></span></code>
<div class="block">Specify the set of columns to define the index on.</div>
</td>
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<td class="colFirst"><code>boolean</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/CacheIndex.html#updateable--">updateable</a></span></code>
<div class="block">Specify if the indexed field is updateable.</div>
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<pre>public abstract&nbsp;<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>[]&nbsp;columnNames</pre>
<div class="block">Specify the set of columns to define the index on.
Not required when annotated on a field/method.</div>
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<dt>Default:</dt>
<dd>{}</dd>
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<pre>public abstract&nbsp;boolean&nbsp;updateable</pre>
<div class="block">Specify if the indexed field is updateable.
If updateable the object will be re-indexed on each update/refresh.</div>
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<dd>true</dd>
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