Package org.hibernate.annotations

Annotation Interface ManyToAny

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

Maps a to-many cardinality association taking values over several entity types which are not related by the usual entity inheritance, using a discriminator value stored in an association table.

The annotated property should be of type List, Set, Collection, or Map, and the elements of the collection must be entities.

For example:

 @ManyToAny
 @Column(name = "property_type")
 @AnyKeyJavaClass(Long.class)
 @AnyDiscriminatorValue(discriminator = "S", entity = StringProperty.class)
 @AnyDiscriminatorValue(discriminator = "I", entity = IntegerProperty.class)
 @JoinTable(name = "repository_properties",
            joinColumns = @JoinColumn(name = "repository_id"),
            inverseJoinColumns = @JoinColumn(name = "property_id"))
 @Cascade(PERSIST)
 private List<Property<?>> properties = new ArrayList<>();
 

In this example, Property is not required to be an entity type, it might even just be an interface, but its subtypes StringProperty and IntegerProperty must be entity classes with the same identifier type.

This is just the many-valued form of Any, and the mapping options are similar, except that the @JoinTable annotation is used to specify the association table.

• AnyDiscriminator, JdbcType, or JdbcTypeCode specifies the type of the discriminator,
• AnyDiscriminatorValue specifies how discriminator values map to entity types.
• AnyKeyJavaType, AnyKeyJavaClass, AnyKeyJdbcType, or AnyKeyJdbcTypeCode specifies the type of the foreign key.
• JoinTable specifies the name of the association table and its foreign key columns.
• Column specifies the column of the association table in which the discriminator value is stored.

See Also:

• Any

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
FetchType	fetch	Specifies whether the value of the field or property should be fetched lazily or eagerly: FetchType.EAGER, the default, requires that the association be fetched immediately, but FetchType.LAZY is a hint which has no effect unless bytecode enhancement is enabled.

Element Details

fetch

FetchType fetch

Specifies whether the value of the field or property should be fetched lazily or eagerly:

• FetchType.EAGER, the default, requires that the association be fetched immediately, but
• FetchType.LAZY is a hint which has no effect unless bytecode enhancement is enabled.

Default:

EAGER