javax.persistence
Annotation Type OneToOne


@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface OneToOne

The OneToOne annotation defines a single-valued association to another entity that has one-to-one multiplicity. It is not normally necessary to specify the associated target entity explicitly since it can usually be inferred from the type of the object being referenced.

Since:
EJB 3.0 version.
Author:
Florent Benoit
See Also:
EJB 3.0 specification

Optional Element Summary
 CascadeType[] cascade
          (Optional) The operations that must be cascaded to the target of the association.
 FetchType fetch
          (Optional) Whether the association should be lazily loaded or must be eagerly fetched.
 java.lang.String mappedBy
          (Optional) The field that owns the relationship.
 boolean optional
          (Optional) Whether the association is optional.
 java.lang.Class targetEntity
          (Optional) The entity class that is the target of the association.
 

targetEntity

public abstract java.lang.Class targetEntity
(Optional) The entity class that is the target of the association.

Default:
void.class

cascade

public abstract CascadeType[] cascade
(Optional) The operations that must be cascaded to the target of the association.

Default:
{}

fetch

public abstract FetchType fetch
(Optional) Whether the association should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the associated entity must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime.

Default:
EAGER

optional

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

Default:
true

mappedBy

public abstract java.lang.String mappedBy
(Optional) The field that owns the relationship. The mappedBy element is only specified on the inverse (non-owning) side of the association.

Default:
""