UniqueConstraint


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.TYPE  ;
28  import static java.lang.annotation.RetentionPolicy.RUNTIME  ;
29  
30  /**
31   * This annotation is used to specify that a unique constraint 
32   * is to be included in the generated DDL for a primary or secondary table.
33   *
34   * <pre>
35   *    Example:
36   *    &#064;Entity
37   *    &#064;Table(
38   *        name="EMPLOYEE", 
39   *        uniqueConstraints=
40   *            &#064;UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
41   *    )
42   *    public class Employee { ... }
43   * </pre>
44   *
45   * @since Java Persistence 1.0
46   */
47  @Target  ({}) 
48  @Retention  (RUNTIME)
49  
50  public @interface UniqueConstraint {
51  
52      /** (Required) An array of the column names that make up the constraint. */
53      String  [] columnNames();
54  }
55
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