javax.persistence

Annotation Type JoinColumns

@Target(value={METHOD,FIELD})
@Retention(value=RUNTIME)
public @interface JoinColumns

Specifies the mapping for composite foreign keys. This annotation groups JoinColumn annotations for the same relationship.

When the JoinColumns annotation is used, both the name and the referencedColumnName elements must be specified in each such JoinColumn annotation.

    Example:
    @ManyToOne
    @JoinColumns({
        @JoinColumn(name="ADDR_ID", referencedColumnName="ID"),
        @JoinColumn(name="ADDR_ZIP", referencedColumnName="ZIP")
    })
    public Address getAddress() { return address; }
 

Since:

Java Persistence 1.0

See Also:

JoinColumn, ForeignKey

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
JoinColumn[]	value The join columns that map the relationship.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
ForeignKey	foreignKey (Optional) Used to specify or control the generation of a foreign key constraint when table generation is in effect.

Element Detail

value

public abstract JoinColumn[] value

The join columns that map the relationship.

foreignKey

public abstract ForeignKey foreignKey

(Optional) Used to specify or control the generation of a foreign key constraint when table generation is in effect. If both this element and the foreignKey element of any of the JoinColumn elements are specified, the behavior is undefined. If no foreign key annotation element is specified in either location, the persistence provider's default foreign key strategy will apply.

Since:

Java Persistence 2.1

Default:

@javax.persistence.ForeignKey(javax.persistence.ConstraintMode.PROVIDER_DEFAULT)