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Tuesday, January 7, 2014

JPA EclipseLink ORM.XML Mapping for Index

There may be other, harder ways to do it, but here's the easy way to add an index on a column when using EclipseLink and XML mappings for JPA. Simply add an empty "index" tag inside the "basic" tag for that entity.

<?xml version="1.0" encoding="UTF-8" standalone="yes"?>
<entity-mappings
    xmlns="http://www.eclipse.org/eclipselink/xsds/persistence/orm"
    version="2.4">
...
    <entity name="MonitorEvent" class="com.webaction.runtime.MonitorEvent">
        <attributes>
...
            <basic name="timeStamp">
                <index />
            </basic>
...
        </attributes>
    </entity>

</entity-mappings>

Someone involved with JPA (or EclipseLink) should really consider some proper XML mapping documentation, because it is not at all sufficient.

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