javax.persistence.Version Maven / Gradle / Ivy
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/*
* The contents of this file are subject to the terms
* 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 static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* This annotation specifies the version field or property of
* an entity class that serves as its optimistic lock value.
* The version is used to ensure integrity when performing the
* merge operation and for optimistic concurrency control.
*
* Only a single Version property or field
* should be used per class; applications that use more than one
* Version property or field will not be portable.
*
*
The Version property should be mapped to
* the primary table for the entity class; applications that
* map the Version property to a table other than
* the primary table will not be portable.
*
*
The following types are supported for version properties:
* int, {@link Integer}, short,
* {@link Short}, long, {@link Long},
* {@link java.sql.Timestamp Timestamp}.
*
*
* Example:
*
* @Version
* @Column(name="OPTLOCK")
* protected int getVersionNum() { return versionNum; }
*
*
* @since Java Persistence 1.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface Version {}