javax.persistence.JoinColumns Maven / Gradle / Ivy
/*******************************************************************************
* Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Linda DeMichiel - Java Persistence 2.1
* Linda DeMichiel - Java Persistence 2.0
*
******************************************************************************/
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static javax.persistence.ConstraintMode.PROVIDER_DEFAULT;
/**
* Specifies the mapping for composite foreign keys. This annotation
* groups JoinColumn annotations for the same relationship.
*
* When the JoinColumns annotation is used,
* both the name and the referencedColumnName elements
* must be specified in each such JoinColumn annotation.
*
*
*
* Example:
* @ManyToOne
* @JoinColumns({
* @JoinColumn(name="ADDR_ID", referencedColumnName="ID"),
* @JoinColumn(name="ADDR_ZIP", referencedColumnName="ZIP")
* })
* public Address getAddress() { return address; }
*
*
* @see JoinColumn
* @see ForeignKey
*
* @since Java Persistence 1.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface JoinColumns {
/**
* The join columns that map the relationship.
*/
JoinColumn[] value();
/**
* (Optional) Used to specify or control the generation of a
* foreign key constraint when table generation is in effect.
* If both this element and the foreignKey element
* of any of the JoinColumn elements are specified,
* the behavior is undefined. If no foreign key annotation element
* is specified in either location, the persistence provider's
* default foreign key strategy will apply.
*
* @since Java Persistence 2.1
*/
ForeignKey foreignKey() default @ForeignKey(PROVIDER_DEFAULT);
}