javax.persistence.AssociationOverride Maven / Gradle / Ivy
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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.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* This annotation is used to override a many-to-one or
* one-to-one mapping of property or field for an entity relationship.
*
* The AssociationOverride annotation may be applied
* to an entity that extends a mapped superclass to override a many-to-one
* or one-to-one mapping defined by the mapped superclass. If the
* AssociationOverride annotation is not specified, the join
* column is mapped the same as in the original mapping.
*
* Example:
* @MappedSuperclass
* public class Employee {
* ...
* @ManyToOne
* protected Address address;
* ...
* }
*
* @Entity
* @AssociationOverride(name="address",
* joinColumns=@JoinColumn(name="ADDR_ID"))
* // address field mapping overridden to ADDR_ID fk
* public class PartTimeEmployee extends Employee {
* ...
* }
*
*
* @see OneToOne
* @see ManyToOne
* @see MappedSuperclass
*
* @since Java Persistence 1.0
*/
@Target({TYPE, METHOD, FIELD})
@Retention(RUNTIME)
public @interface AssociationOverride {
/**
* The name of the relationship property whose mapping is
* being overridden if property-based access is being used,
* or the name of the relationship field if field-based access is used.
*/
String name();
/**
* The join column that is being mapped to the persistent
* attribute. The mapping type will remain the same as is defined
* in the mapped superclass.
*/
JoinColumn[] joinColumns();
}