/*
* Copyright (c) 2008, 2009 Sun Microsystems. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
* which accompanies this distribution.
* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
* and the Eclipse Distribution License is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* Contributors:
* Linda DeMichiel - Java Persistence 2.0 - Version 2.0 (October 1, 2009)
* Specification available from http://jcp.org/en/jsr/detail?id=317
*/
// $Id: UniqueConstraint.java 20957 2011-06-13 09:58:51Z stliu $
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* Specifies that a unique constraint is to be included in
* the generated DDL for a primary or secondary table.
*
* <pre>
* Example:
* @Entity
* @Table(
* name="EMPLOYEE",
* uniqueConstraints=
* @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
* )
* public class Employee { ... }
* </pre>
*
* @since Java Persistence 1.0
*/
@Target({ })
@Retention(RUNTIME)
public @interface UniqueConstraint {
/**
* (Optional) Constraint name. A provider-chosen name will be chosen
* if a name is not specified.
*
* @since Java Persistence 2.0
*/
String name() default "";
/**
* (Required) An array of the column names that make up the constraint.
*/
String[] columnNames();
}