javax.persistence

Annotation Type JoinColumns

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

Defines 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

Required Element Summary

Required Elements

Modifier and Type	Required Element and Description
JoinColumn[]	value

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
ForeignKey	foreignKey (Optional) The foreign key constraint specification for the join columns.

Element Detail

value

public abstract JoinColumn[] value

foreignKey

public abstract ForeignKey foreignKey

(Optional) The foreign key constraint specification for the join columns. This is used only if table generation is in effect. Default is provider defined.

Returns:

The foreign key specification

Default:

@javax.persistence.ForeignKey