Defines one or more properties of the primary key column for a class using internal identity. This extension uses nested extensions (see db-column extension). If the type of the primary key column is not compatible with INTEGER then a db-key-generator is required to persist new instances.
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<class name="Category">
<extension key="db-primary-key">
<extension key="db-column">
<extension key="db-type" value="SMALLINT" />
</extension>
</extension>
</class>
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