@Target(value={TYPE,METHOD,FIELD}) @Retention(value=RUNTIME) public @interface PrimaryKeyJoinColumn
JOINED
mapping strategy
to the primary table of its superclass; it is used within a
SecondaryTable
annotation to join a secondary table
to a primary table; and it may be used in a OneToOne
mapping in which the primary key of the referencing entity
is used as a foreign key to the referenced entity.
If no PrimaryKeyJoinColumn
annotation is
specified for a subclass in the JOINED
mapping strategy, the foreign key columns are assumed
to have the same names as the primary key columns of the
primary table of the superclass.
Example: Customer and ValuedCustomer subclass @Entity @Table(name="CUST") @Inheritance(strategy=JOINED) @DiscriminatorValue("CUST") public class Customer { ... } @Entity @Table(name="VCUST") @DiscriminatorValue("VCUST") @PrimaryKeyJoinColumn(name="CUST_ID") public class ValuedCustomer extends Customer { ... }
SecondaryTable
,
Inheritance
,
OneToOne
Modifier and Type | Optional Element and Description |
---|---|
String |
columnDefinition
(Optional) The SQL fragment that is used when generating the
DDL for the column.
|
ForeignKey |
foreignKey
(Optional) The foreign key constraint specification for the join column.
|
String |
name
(Optional) The name of the primary key column of the current table.
|
String |
referencedColumnName
(Optional) The name of the primary key column of the table
being joined to.
|
public abstract String name
JOINED
mapping strategy); the same
name as the primary key column of the primary table
(SecondaryTable
mapping); or the same name as the
primary key column for the table for the referencing entity
(OneToOne
mapping).public abstract String referencedColumnName
JOINED
mapping strategy); the same name
as the primary key column of the primary table
(SecondaryTable
mapping); or the same name as the
primary key column for the table for the referencing entity
(OneToOne
mapping).public abstract String columnDefinition
OneToOne
primary key association.
Defaults to the generated SQL to create a column of the inferred type.public abstract ForeignKey foreignKey
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