javax.persistence
Annotation Type OneToMany

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

Defines a many-valued association with one-to-many multiplicity.

If the collection is defined using generics to specify the element type, the associated target entity type need not be specified; otherwise the target entity class must be specified.

    Example 1: One-to-Many association using generics
    In Customer class:




Since:
  
Java Persistence API 1.0







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



          The field that owns the relationship.



 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.



 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.
 Optional only if the collection property is defined using Java generics.
 Must be specified otherwise.
 
 

 Defaults to the parameterized type of the collection when defined using
 generics.







Default:
void.class





cascade
public abstract CascadeType[] cascade

(Optional) The operations that must be cascaded to the target of the
 association.
 

 Defaults to no operations being cascaded.







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 persistenceprovider runtime that the
 associatedentities must be eagerly fetched. The
 LAZY strategy is a hint to the persistence
 provider runtime.







Default:
javax.persistence.FetchType.LAZY





mappedBy
public abstract java.lang.String mappedBy

The field that owns the relationship. Required unless the relationship is
 unidirectional.







Default:
""





orphanRemoval
public abstract 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.





Since:
  
Java Persistence API 2.0


Default:
false