javax.persistence.DiscriminatorValue - JPA annotation
javax.persistence
Annotation DiscriminatorValue
- Target:
- Classes
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:
- JPA 1.0
- See Also:
-
DiscriminatorColumn
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.
- Since:
- JPA 1.0