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@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface OneToManyDefines 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:
@OneToMany(cascade=ALL, mappedBy="customer")
public Set getOrders() { return orders; }
In Order class:
@ManyToOne
@JoinColumn(name="CUST_ID", nullable=false)
public Customer getCustomer() { return customer; }
Example 2: One-to-Many association without using generics
In Customer class:
@OneToMany(targetEntity=com.acme.Order.class, cascade=ALL,
mappedBy="customer")
public Set getOrders() { return orders; }
In Order class:
@ManyToOne
@JoinColumn(name="CUST_ID", nullable=false)
public Customer getCustomer() { return customer; }
| 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. |
java.lang.Class |
targetEntity
(Optional) The entity class that is the target of the association. |
public abstract java.lang.Class targetEntity
Defaults to the parameterized type of the collection when defined using generics.
public abstract CascadeType[] cascade
Defaults to no operations being cascaded.
public abstract FetchType fetch
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.
public abstract java.lang.String mappedBy
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EclipseLink 1.1.0_ 1.1.0.r3634 API Reference | |||||||||
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