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| <h2 title="Annotation Type BatchFetch" class="title">Annotation Type BatchFetch</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>}) |
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| public @interface <span class="memberNameLabel">BatchFetch</span></pre> |
| <div class="block">A BatchFetch annotation can be used on any relationship mapping, |
| (OneToOne, ManyToOne, OneToMany, ManyToMany, ElementCollection, BasicCollection, BasicMap). |
| It allows the related objects to be batch read in a single query. |
| Batch fetching can also be set at the query level, and it is |
| normally recommended to do so as all queries may not require batching.</div> |
| <dl> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>James Sutherland</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>EclipseLink 2.1</dd> |
| </dl> |
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| <h3>Optional Element Summary</h3> |
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| <caption><span>Optional 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">Optional Element and Description</th> |
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| <tr class="altColor"> |
| <td class="colFirst"><code>int</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetch.html#size--">size</a></span></code> |
| <div class="block">Define the default batch fetch size.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code><a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a></code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/BatchFetch.html#value--">value</a></span></code> |
| <div class="block">(Optional) The type of batch-fetch to use.</div> |
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| <h4>value</h4> |
| <pre>public abstract <a href="../../../../org/eclipse/persistence/annotations/BatchFetchType.html" title="enum in org.eclipse.persistence.annotations">BatchFetchType</a> value</pre> |
| <div class="block">(Optional) The type of batch-fetch to use. |
| Either JOIN, EXISTS or IN. |
| JOIN is the default.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>org.eclipse.persistence.annotations.BatchFetchType.JOIN</dd> |
| </dl> |
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| <h4>size</h4> |
| <pre>public abstract int size</pre> |
| <div class="block">Define the default batch fetch size. |
| This is only used for IN type batch reading and defines |
| the number of keys used in each IN clause. |
| The default size is 256, or the query's pageSize for cursor queries.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>-1</dd> |
| </dl> |
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