Top Description Methods
jakarta.persistence

public @Interface DiscriminatorValue

extends Annotation
Annotations
@Target:TYPE
@Retention:RUNTIME
Imports
java.lang.annotation.Target, .Retention

Specifies the value of the discriminator column for the annotated entity 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 is 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 for the root of an entity class hierarchy or subhierarchy in which a different inheritance strategy is applied. But the discriminator value, if not defaulted, should be specified for each concrete 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 { ... }
@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
1.0
See Also
DiscriminatorColumn

Method Summary

Modifier and TypeMethod and Description
public String
value()

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

Inherited from java.lang.annotation.Annotation:
annotationTypeequalshashCodetoString

Method Detail

valueback to summary
public 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 is used to generate a value representing the entity type. If the DiscriminatorType is STRING, the discriminator value default is the entity name.