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| <h2 class="refsect1"><font face="arial, helvetica, sans-serif" color="#330099">@ValuePartition</font></h2> |
| <p>Use <code>@ValuePartition</code> to represent a specific value partition that will be routed to a specific connection pool.</p> |
| <a id="sthref431" name="sthref431"></a> |
| <p><strong><br /><span class="refsubsect">Annotation Elements</span></strong></p> |
| <p><a href="#CACBHEHI">Table 2-76</a> describes this annotation's elements.</p> |
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| <p><strong><em><font face="arial, helvetica, sans-serif">Table 2-76 @ValuePartition Annotation Elements</font></em></strong></p> |
| <table class="HRuleFormalWide" title="@ValuePartition 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="23%" /> |
| <col width="*" /> |
| <col width="20%" /> |
| <thead> |
| <tr align="left" valign="top"> |
| <th align="left" valign="bottom" id="r1c1-t93"><font face="Arial, Helvetica, sans-serif"><strong>Annotation Element</strong></font></th> |
| <th align="left" valign="bottom" id="r1c2-t93"><font face="Arial, Helvetica, sans-serif"><strong>Description</strong></font></th> |
| <th align="left" valign="bottom" id="r1c3-t93"><font face="Arial, Helvetica, sans-serif"><strong>Default</strong></font></th> |
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| <td align="left" id="r2c1-t93" headers="r1c1-t93"> |
| <p><code>connectionPool</code></p> |
| </td> |
| <td align="left" headers="r2c1-t93 r1c2-t93"> |
| <p>The connection pool to which to route queries to for the <code>value</code></p> |
| </td> |
| <td align="left" headers="r2c1-t93 r1c3-t93"><br /></td> |
| </tr> |
| <tr align="left" valign="top"> |
| <td align="left" id="r3c1-t93" headers="r1c1-t93"> |
| <p><code>value</code></p> |
| </td> |
| <td align="left" headers="r3c1-t93 r1c2-t93"> |
| <p>The <code>String</code> representation of the value</p> |
| </td> |
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| <p><strong><br /><span class="refsubsect">Examples</span></strong></p> |
| <p><a href="#CJHFDJAC">Example 2-122</a> shows how to use the <code>@ValuePartition</code> and <code>@ValuePartitioning</code> annotations.</p> |
| <div class="example"><a id="CJHFDJAC" name="CJHFDJAC"></a><a id="TLJPA587" name="TLJPA587"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-122 Using @ValuePartition Annotation</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| @Entity |
| @Table(name = "PART_EMPLOYEE") |
| @IdClass(EmployeePK.class) |
| <strong>@ValuePartitioning</strong>( |
| name="ValuePartitioningByLOCATION", |
| partitionColumn=@Column(name="LOCATION"), |
| unionUnpartitionableQueries=true, |
| defaultConnectionPool="default", |
| partitions={ |
| <strong>@ValuePartition</strong>(connectionPool="node2", value="Ottawa"), |
| <strong>@ValuePartition</strong>(connectionPool="node3", value="Toronto") |
| }) |
| @Partitioned("ValuePartitioningByLOCATION") |
| public class Employee implements Serializable, Cloneable { |
| ... |
| } |
| </pre></div> |
| <!-- class="example" --> |
| <p><a href="#CJHBEIGD">Example 2-123</a> shows how to use the <code><partition></code> element in the <code>eclipselink-orm.xml</code> file.</p> |
| <div class="example"><a id="CJHBEIGD" name="CJHBEIGD"></a><a id="TLJPA588" name="TLJPA588"></a> |
| <p><strong><em><font face="arial, helvetica, sans-serif">Example 2-123 Using <partition> XML</font></em></strong></p> |
| <pre xml:space="preserve" class="oac_no_warn"> |
| <entity name="Employee" class="Employee" access="FIELD"> |
| <table name="PART_EMPLOYEE"/> |
| <id-class class="EmployeePK"/> |
| <<strong>value-partitioning</strong> name="ValuePartitioningByLOCATION" union-unpartitionable-queries="true" default-connection-pool="default"> |
| <partition-column name="LOCATION"/> |
| <partition connection-pool="node2" value="Ottawa"/> |
| <partition connection-pool="node3" value="Toronto"/> |
| </value-partitioning> |
| <partitioned>ValuePartitioningByLOCATION</partitioned> |
| </pre></div> |
| <!-- class="example" --> |
| <a id="sthref434" name="sthref434"></a> |
| <p><strong><br /><span class="refsubsect">See Also</span></strong></p> |
| <p>For more information, see:</p> |
| <ul> |
| <li> |
| <p><a href="a_partitioned.htm#CHDDAHEB">"@Partitioned"</a></p> |
| </li> |
| <li> |
| <p><a href="a_valuepartitioning.htm#CEGHFJDJ">"@ValuePartitioning"</a></p> |
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