javax.persistence.UniqueConstraint Maven / Gradle / Ivy
// $Id: UniqueConstraint.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
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();
}