javax.persistence.UniqueConstraint Maven / Gradle / Ivy
/*
* Copyright (c) 2008, 2018 Oracle and/or its affiliates. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v. 2.0 which is available at
* http://www.eclipse.org/legal/epl-2.0,
* or the Eclipse Distribution License v. 1.0 which is available at
* http://www.eclipse.org/org/documents/edl-v10.php.
*
* SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
*/
// Contributors:
// Linda DeMichiel - Java Persistence 2.1
// Linda DeMichiel - Java Persistence 2.0
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.
*
*
* Example:
* @Entity
* @Table(
* name="EMPLOYEE",
* uniqueConstraints=
* @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
* )
* public class Employee { ... }
*
*
* @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();
}