Java EE 5 SDK

javax.persistence
Annotation Type DiscriminatorValue


@Target(value=TYPE)
@Retention(value=RUNTIME)
public @interface DiscriminatorValue

Is used to specify the value of the discriminator column for entities of the given type. The DiscriminatorValue annotation can only be specified on a concrete entity class. If the DiscriminatorValue annotation is not specified and a discriminator column is used, a provider-specific function will be used to generate a value representing the entity type. If the DiscriminatorType is STRING, the discriminator value default is the entity name.

The inheritance strategy and the discriminator column are only specified in the root of an entity class hierarchy or subhierarchy in which a different inheritance strategy is applied. The discriminator value, if not defaulted, should be specified for each entity class in the hierarchy.


    Example:

    @Entity
    @Table(name="CUST")
    @Inheritance(strategy=SINGLE_TABLE)
    @DiscriminatorColumn(name="DISC", discriminatorType=STRING,length=20)
    @DiscriminatorValue("CUSTOMER")
    public class Customer { ... }

    @Entity
    @DiscriminatorValue("VCUSTOMER")
    public class ValuedCustomer extends Customer { ... }
 

Since:
Java Persistence 1.0

Required Element Summary
 String value
          (Optional) The value that indicates that the row is an entity of the annotated entity type.
 

Element Detail

value

public abstract String value
(Optional) The value that indicates that the row is an entity of the annotated entity type.

If the DiscriminatorValue annotation is not specified and a discriminator column is used, a provider-specific function will be used to generate a value representing the entity type. If the DiscriminatorType is STRING, the discriminator value default is the entity name.


Java EE 5 SDK

Copyright 2006 Sun Microsystems, Inc. All rights reserved.

This documentation is deprecated and will be removed in the next release of WebLogic Server.


Oracle Fusion Middleware Sun Microsystems Persistence API Reference (DEPRECATED)
12c Release 1 (12.1.1)
Part Number E24399_01