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| <div class="subTitle">org.eclipse.persistence.annotations</div> |
| <h2 title="Annotation Type HashPartitioning" class="title">Annotation Type HashPartitioning</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#TYPE" title="class or interface in java.lang.annotation">TYPE</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">HashPartitioning</span></pre> |
| <div class="block">HashPartitioning partitions access to a database cluster by the hash of a field value from the object, |
| such as the object's location, or tenant. |
| The hash indexes into the list of connection pools. |
| All write or read request for object's with that hash value are sent to the server. |
| If a query does not include the field as a parameter, then it can either be sent |
| to all server's and unioned, or left to the sesion's default behavior. |
| <p> |
| Partitioning can be enabled on an Entity, relationship, query, or session/persistence unit. |
| Partition policies are globally named to allow reuse, |
| the partitioning policy must also be set using the @Partitioned annotation to be used.</div> |
| <dl> |
| <dt><span class="seeLabel">See Also:</span></dt> |
| <dd><a href="../../../../org/eclipse/persistence/annotations/Partitioned.html" title="annotation in org.eclipse.persistence.annotations"><code>Partitioned</code></a>, |
| <a href="../../../../org/eclipse/persistence/descriptors/partitioning/HashPartitioningPolicy.html" title="class in org.eclipse.persistence.descriptors.partitioning"><code>HashPartitioningPolicy</code></a></dd> |
| <dt><span class="simpleTagLabel">Author:</span></dt> |
| <dd>James Sutherland</dd> |
| <dt><span class="simpleTagLabel">Since:</span></dt> |
| <dd>EclipseLink 2.2</dd> |
| </dl> |
| </li> |
| </ul> |
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| <!-- =========== ANNOTATION TYPE REQUIRED MEMBER SUMMARY =========== --> |
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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/HashPartitioning.html#name--">name</a></span></code> |
| <div class="block">The name of the partition policy, names must be unique for the persistence unit.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>jakarta.persistence.Column</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/HashPartitioning.html#partitionColumn--">partitionColumn</a></span></code> |
| <div class="block">The database column or query parameter to partition queries by.</div> |
| </td> |
| </tr> |
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| <tr> |
| <th class="colFirst" scope="col">Modifier and Type</th> |
| <th class="colLast" scope="col">Optional Element and Description</th> |
| </tr> |
| <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/HashPartitioning.html#connectionPools--">connectionPools</a></span></code> |
| <div class="block">List of connection pool names to partition across.</div> |
| </td> |
| </tr> |
| <tr class="rowColor"> |
| <td class="colFirst"><code>boolean</code></td> |
| <td class="colLast"><code><span class="memberNameLink"><a href="../../../../org/eclipse/persistence/annotations/HashPartitioning.html#unionUnpartitionableQueries--">unionUnpartitionableQueries</a></span></code> |
| <div class="block">Defines if queries that do not contain the partition field should be sent |
| to every database and have the result unioned.</div> |
| </td> |
| </tr> |
| </table> |
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| </li> |
| </ul> |
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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">The name of the partition policy, names must be unique for the persistence unit.</div> |
| </li> |
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| <h4>partitionColumn</h4> |
| <pre>public abstract jakarta.persistence.Column partitionColumn</pre> |
| <div class="block">The database column or query parameter to partition queries by. |
| This is the table column name, not the class attribute name. |
| The column value must be included in the query and should normally be part of the object's Id. |
| This can also be the name of a query parameter. |
| If a query does not contain the field the query will not be partitioned.</div> |
| </li> |
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| <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>[] connectionPools</pre> |
| <div class="block">List of connection pool names to partition across. |
| Defaults to all defined pools in the ServerSession.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>{}</dd> |
| </dl> |
| </li> |
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| <h4>unionUnpartitionableQueries</h4> |
| <pre>public abstract boolean unionUnpartitionableQueries</pre> |
| <div class="block">Defines if queries that do not contain the partition field should be sent |
| to every database and have the result unioned.</div> |
| <dl> |
| <dt>Default:</dt> |
| <dd>false</dd> |
| </dl> |
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