Package javax.persistence
Annotation Type DiscriminatorColumn
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@Target(TYPE) @Retention(RUNTIME) public @interface DiscriminatorColumnSpecifies the discriminator column for theSINGLE_TABLEandJOINEDInheritancemapping strategies.The 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
If the
DiscriminatorColumnannotation is missing, and a discriminator column is required, the name of the discriminator column defaults to"DTYPE"and the discriminator type toDiscriminatorType.STRING.Example: @Entity @Table(name="CUST") @Inheritance(strategy=SINGLE_TABLE) @DiscriminatorColumn(name="DISC", discriminatorType=STRING, length=20) public class Customer { ... } @Entity public class ValuedCustomer extends Customer { ... }- See Also:
DiscriminatorValue- Since:
- 1.0
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Optional Element Summary
Optional Elements Modifier and Type Optional Element Description java.lang.StringcolumnDefinition(Optional) The SQL fragment that is used when generating the DDL for the discriminator column.DiscriminatorTypediscriminatorType(Optional) The type of object/column to use as a class discriminator.intlength(Optional) The column length for String-based discriminator types.java.lang.Stringname(Optional) The name of column to be used for the discriminator.
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discriminatorType
DiscriminatorType discriminatorType
(Optional) The type of object/column to use as a class discriminator. Defaults toDiscriminatorType.STRING.- Default:
- javax.persistence.DiscriminatorType.STRING
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