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EclipseLink 2.2.0, build 'v20110202-r8913' API Reference | ||||||||
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@Target(value=TYPE) @Retention(value=RUNTIME) public @interface DiscriminatorValue
Specifies 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 { ... }
DiscriminatorColumn
Required Element Summary | |
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java.lang.String |
value
(Optional) The value that indicates that the row is an entity of the annotated entity type. |
Element Detail |
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public abstract java.lang.String value
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.
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EclipseLink 2.2.0, build 'v20110202-r8913' API Reference | ||||||||
PREV CLASS NEXT CLASS | FRAMES NO FRAMES | ||||||||
SUMMARY: REQUIRED | OPTIONAL | DETAIL: ELEMENT |