Module jakarta.persistence
Package jakarta.persistence

Annotation Interface PrimaryKeyJoinColumn

@Repeatable(PrimaryKeyJoinColumns.class) @Target({TYPE,METHOD,FIELD}) @Retention(RUNTIME) public @interface PrimaryKeyJoinColumn
Specifies a primary key column that is used as a foreign key to join to another table.

It is used to join the primary table of an entity subclass in the 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 { ... }
Since:
1.0
See Also:

  • Optional Element Summary

    Optional Elements
    Modifier and Type
    Optional Element
    Description
    String
    columnDefinition
    (Optional) The SQL fragment that is used when generating the DDL for the column.
    ForeignKey
    foreignKey
    (Optional) Used to specify or control the generation of a foreign key constraint for the primary key join column when table generation is in effect.
    String
    name
    (Optional) The name of the primary key column of the current table.
    String
    options
    (Optional) A SQL fragment appended to the generated DDL which declares this column.
    String
    referencedColumnName
    (Optional) The name of the primary key column of the table being joined to.

  • Element Details

    • name

      String name
      (Optional) The name of the primary key column of the current table.

      Defaults to the same name as the primary key column of the primary table of the superclass (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).

      Default:
      ""

    • referencedColumnName

      String referencedColumnName
      (Optional) The name of the primary key column of the table being joined to.

      Defaults to the same name as the primary key column of the primary table of the superclass (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).

      Default:
      ""

    • columnDefinition

      String columnDefinition
      (Optional) The SQL fragment that is used when generating the DDL for the column. This should not be specified for a OneToOne primary key association.

      Defaults to the generated SQL to create a column of the inferred type.

      Default:
      ""

    • options

      String options
      (Optional) A SQL fragment appended to the generated DDL which declares this column. May not be used in conjunction with columnDefinition().
      Since:
      3.2
      Default:
      ""

    • foreignKey

      ForeignKey foreignKey
      (Optional) Used to specify or control the generation of a foreign key constraint for the primary key join column when table generation is in effect. If this element is not specified, the persistence provider's default foreign key strategy will apply.
      Since:
      2.1
      Default:
      @jakarta.persistence.ForeignKey(PROVIDER_DEFAULT)