javax.persistence.OneToMany Maven / Gradle / Ivy
/*
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* of the Common Development and Distribution License
* (the License). You may not use this file except in
* compliance with the License.
*
* You can obtain a copy of the license at
* https://glassfish.dev.java.net/public/CDDLv1.0.html or
* glassfish/bootstrap/legal/CDDLv1.0.txt.
* See the License for the specific language governing
* permissions and limitations under the License.
*
* When distributing Covered Code, include this CDDL
* Header Notice in each file and include the License file
* at glassfish/bootstrap/legal/CDDLv1.0.txt.
* If applicable, add the following below the CDDL Header,
* with the fields enclosed by brackets [] replaced by
* you own identifying information:
* "Portions Copyrighted [year] [name of copyright owner]"
*
* Copyright 2006 Sun Microsystems, Inc. All rights reserved.
*/
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import javax.persistence.CascadeType;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.FetchType.LAZY;
/**
* 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:
*
* @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; }
*
*
* @since Java Persistence 1.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface OneToMany {
/**
* (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.
*/
Class targetEntity() default void.class;
/**
* (Optional) The operations that must be cascaded to
* the target of the association.
*
Defaults to no operations being cascaded.
*/
CascadeType[] cascade() default {};
/** (Optional) Whether the association should be
* lazily loaded or must be eagerly fetched. The
* {@link FetchType#EAGER EAGER} strategy is a
* requirement on the persistenceprovider runtime
* that the associatedentities must be eagerly fetched.
* The {@link FetchType#LAZY LAZY} strategy is a hint
* to the persistence provider runtime.
*/
FetchType fetch() default LAZY;
/**
* The field that owns the relationship. Required unless
* the relationship is unidirectional.
*/
String mappedBy() default "";
}