Annotation Type 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.

    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 Detail

      • 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:
        jakarta.persistence.FetchType.EAGER