Module org.eclipse.persistence.core
Package org.eclipse.persistence.annotations

Annotation Type VariableOneToOne

@Target({METHOD,FIELD}) @Retention(RUNTIME) public @interface VariableOneToOne
Variable one to one mappings are used to represent a pointer references between a java object and an implementer of an interface. This mapping is usually represented by a single pointer (stored in an instance variable) between the source and target objects. In the relational database tables, these mappings are normally implemented using a foreign key and a type code. A VariableOneToOne can be specified within an Entity, MappedSuperclass and Embeddable class.
Since:
Eclipselink 1.0

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    CascadeType[]
    cascade
    (Optional) The operations that must be cascaded to the target of the association.
    DiscriminatorClass[]
    discriminatorClasses
    (Optional) The list of discriminator types that can be used with this VariableOneToOne.
    DiscriminatorColumn
    discriminatorColumn
    (Optional) The discriminator column will hold the type indicators.
    FetchType
    fetch
    (Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched.
    boolean
    optional
    (Optional) Whether the association is optional.
    boolean
    orphanRemoval
    (Optional) Whether to apply the remove operation to entities that have been removed from the relationship and to cascade the remove operation to those entities.
    Class<?>
    targetInterface
    (Optional) The interface class that is the target of the association.

  • Element Details

    • targetInterface

      Class<?> targetInterface
      (Optional) The interface class that is the target of the association. If not specified it will be inferred from the type of the object being referenced.
      Default:
      void.class

    • cascade

      CascadeType[] cascade
      (Optional) The operations that must be cascaded to the target of the association.
      Default:
      {}

    • fetch

      FetchType fetch
      (Optional) Defines whether the value of the field or property should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the value must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime. If not specified, defaults to EAGER.
      Default:
      EAGER

    • optional

      boolean optional
      (Optional) Whether the association is optional. If set to false then a non-null relationship must always exist.
      Default:
      true

    • orphanRemoval

      boolean orphanRemoval
      (Optional) Whether to apply the remove operation to entities that have been removed from the relationship and to cascade the remove operation to those entities.
      Default:
      false

    • discriminatorColumn

      DiscriminatorColumn discriminatorColumn
      (Optional) The discriminator column will hold the type indicators. If the DiscriminatorColumn is not specified, the name of the discriminator column defaults to "DTYPE" and the discriminator type to STRING.
      Default:
      @jakarta.persistence.DiscriminatorColumn

    • discriminatorClasses

      DiscriminatorClass[] discriminatorClasses
      (Optional) The list of discriminator types that can be used with this VariableOneToOne. If none are specified then those entities within the persistence unit that implement the target interface will be added to the list of types. The discriminator type will default as follows: - If DiscriminatorColumn type is STRING: Entity.name() - If DiscriminatorColumn type is CHAR: First letter of the Entity class - If DiscriminatorColumn type is INTEGER: The next integer after the highest integer explicitly added.
      Default:
      {}