javax.persistence.Version Maven / Gradle / Ivy
// $Id: Version.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
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;
/**
* 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, Integer, short,
* Short, long, Long,
* java.sql.Timestamp.
*
*
* Example:
*
* @Version
* @Column(name="OPTLOCK")
* protected int getVersionNum() { return versionNum; }
*
*
* @since Java Persistence 1.0
*/
@Target({ METHOD, FIELD })
@Retention(RUNTIME)
public @interface Version {
}