Version


1   /*
2    * The contents of this file are subject to the terms 
3    * of the Common Development and Distribution License 
4    * (the License).  You may not use this file except in
5    * compliance with the License.
6    * 
7    * You can obtain a copy of the license at 
8    * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9    * glassfish/bootstrap/legal/CDDLv1.0.txt.
10   * See the License for the specific language governing 
11   * permissions and limitations under the License.
12   * 
13   * When distributing Covered Code, include this CDDL 
14   * Header Notice in each file and include the License file 
15   * at glassfish/bootstrap/legal/CDDLv1.0.txt.  
16   * If applicable, add the following below the CDDL Header, 
17   * with the fields enclosed by brackets [] replaced by
18   * you own identifying information: 
19   * "Portions Copyrighted [year] [name of copyright owner]"
20   * 
21   * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22   */
23  package javax.persistence;
24  
25  import java.lang.annotation.Target  ;
26  import java.lang.annotation.Retention  ;
27  import static java.lang.annotation.ElementType.METHOD  ;
28  import static java.lang.annotation.ElementType.FIELD  ;
29  import static java.lang.annotation.RetentionPolicy.RUNTIME  ;
30  
31  /**
32   * This annotation specifies the version field or property of 
33   * an entity class that serves as its optimistic lock value. 
34   * The version is used to ensure integrity when performing the 
35   * merge operation and for optimistic concurrency control. 
36   *
37   * <p> Only a single <code>Version</code> property or field 
38   * should be used per class; applications that use more than one 
39   * <code>Version</code> property or field will not be portable. 
40   * 
41   * <p> The <code>Version</code> property should be mapped to 
42   * the primary table for the entity class; applications that 
43   * map the <code>Version</code> property to a table other than 
44   * the primary table will not be portable.
45   * 
46   * <p> The following types are supported for version properties: 
47   * <code>int</code>, {@link Integer}, <code>short</code>, 
48   * {@link Short}, <code>long</code>, {@link Long}, 
49   * {@link java.sql.Timestamp Timestamp}.
50   *
51   * <pre>
52   *    Example:
53   *
54   *    &#064;Version
55   *    &#064;Column(name="OPTLOCK")
56   *    protected int getVersionNum() { return versionNum; }
57   * </pre>
58   *
59   * @since Java Persistence 1.0
60   */
61  @Target  ({METHOD, FIELD})
62  @Retention  (RUNTIME)
63  
64  public @interface Version {}
65
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