org.eclipse.persistence.annotations.ExistenceChecking Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of eclipselink Show documentation

EclipseLink build based upon Git transaction f2b9fc5

There is a newer version: 5.0.0-B03

/*
 * Copyright (c) 1998, 2018 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//  04/15/2008-1.0M7 Guy Pelletier
//     - 226517: Add existence support to the EclipseLink-ORM.XML Schema
package org.eclipse.persistence.annotations;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import static org.eclipse.persistence.annotations.ExistenceType.CHECK_CACHE;

/**
 * The ExistenceChecking annotation is used to specify the type of checking
 * EclipseLink should use when determining if an entity is new or existing.
 * It is specifically used on a merge() operation to determine if only the cache
 * should be used to determine if an object exists, or the object should
 * be read (from the database or cache).  By default the object is read.
 *
 * An existence-checking specification is supported on an Entity or
 * MappedSuperclass annotation.
 *
 * @see org.eclipse.persistence.annotations.ExistenceType
 * @see org.eclipse.persistence.queries.DoesExistQuery
 * @author Guy Pelletier
 * @since Eclipselink 1.0
 */
@Target({TYPE})
@Retention(RUNTIME)
public @interface ExistenceChecking {
    /**
     * (Optional) Set the existence check for determining
     * if an insert or update should occur for an object.
     */
    ExistenceType value() default CHECK_CACHE;
}