57 lines
1.7 KiB
Java
57 lines
1.7 KiB
Java
/** *****************************************************************************
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* Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
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* which accompanies this distribution.
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* The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
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* and the Eclipse Distribution License is available at
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* http://www.eclipse.org/org/documents/edl-v10.php.
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*
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* Contributors:
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* Linda DeMichiel - Java Persistence 2.1
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* Linda DeMichiel - Java Persistence 2.0
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*
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***************************************************************************** */
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package javax.persistence;
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import java.lang.annotation.Target;
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import java.lang.annotation.Retention;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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/**
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* Specifies that a unique constraint is to be included in
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* the generated DDL for a primary or secondary table.
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*
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* <pre>
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* Example:
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* @Entity
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* @Table(
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* name="EMPLOYEE",
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* uniqueConstraints=
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* @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"})
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* )
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* public class Employee { ... }
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* </pre>
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*
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* @since Java Persistence 1.0
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*/
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@Target({})
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@Retention(RUNTIME)
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public @interface UniqueConstraint {
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/** (Optional) Constraint name. A provider-chosen name will be chosen
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* if a name is not specified.
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*
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* @return String
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* @since Java Persistence 2.0
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*/
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String name() default "";
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/** (Required) An array of the column names that make up the constraint.
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*
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* @return String[]
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*/
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String[] columnNames();
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}
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