javax.persistence.IdClass Maven / Gradle / Ivy
// $Id: IdClass.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.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* Specifies a composite primary key class that is mapped to
* multiple fields or properties of the entity.
*
* The names of the fields or properties in the primary key
* class and the primary key fields or properties of the entity
* must correspond and their types must be the same.
*
*
*
* Example:
*
* @IdClass(com.acme.EmployeePK.class)
* @Entity
* public class Employee {
* @Id String empName;
* @Id Date birthDay;
* ...
* }
*
*
* @since Java Persistence 1.0
*/
@Target({TYPE})
@Retention(RUNTIME)
public @interface IdClass {
/** Primary key class */
Class value();
}