Package javax.persistence

Annotation Interface MapKeyJoinColumns

@Target({METHOD,FIELD})
@Retention(RUNTIME)
public @interface MapKeyJoinColumns

Supports composite map keys that reference entities.

The MapKeyJoinColumns annotation groups MapKeyJoinColumn annotations. When the MapKeyJoinColumns annotation is used, both the name and the referencedColumnName elements must be specified in each of the grouped MapKeyJoinColumn annotations.

Since:

Java Persistence 2.0

See Also:

• MapKeyJoinColumn
• ForeignKey

Required Element Summary

Required Elements

Modifier and Type	Required Element	Description
MapKeyJoinColumn[]	value	(Required) The map key join columns that are used to map to the entity that is the map key.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
ForeignKey	foreignKey	(Optional) Used to specify or control the generation of a foreign key constraint when table generation is in effect.

Element Details

value

MapKeyJoinColumn[] value

(Required) The map key join columns that are used to map to the entity that is the map key.

foreignKey

ForeignKey foreignKey

(Optional) Used to specify or control the generation of a foreign key constraint when table generation is in effect. If both this element and the foreignKey element of any of the MapKeyJoinColumn elements are specified, the behavior is undefined. If no foreign key annotation element is specified in either location, the persistence provider's default foreign key strategy will apply.

Since:

Java Persistence 2.1

Default:

@javax.persistence.ForeignKey(PROVIDER_DEFAULT)