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javax.persistence.IdClass Maven / Gradle / Ivy

package javax.persistence;

import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * 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(); }




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