javax.persistence.JoinTable Maven / Gradle / Ivy
// $Id: JoinTable.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* Used in the mapping of associations. It is specified on the
* owning side of an association.
*
* A join table is typically used in the mapping of many-to-many
* and unidirectional one-to-many associations. It may also be used to
* map bidirectional many-to-one/one-to-many associations,
* unidirectional many-to-one relationships, and one-to-one
* associations (both bidirectional and unidirectional).
*
*
When a join table is used in mapping a relationship with an
*embeddable class on the owning side of the relationship, the
*containing entity rather than the embeddable class is considered the
*owner of the relationship.
*
*
If the JoinTable annotation is missing, the
* default values of the annotation elements apply.
* The name of the join table is assumed to be the table names of the
* associated primary tables concatenated together (owning side
* first) using an underscore.
*
*
*
* Example:
*
* @JoinTable(
* name="CUST_PHONE",
* joinColumns=
* @JoinColumn(name="CUST_ID", referencedColumnName="ID"),
* inverseJoinColumns=
* @JoinColumn(name="PHONE_ID", referencedColumnName="ID")
* )
*
*
* @see JoinColumn
* @see JoinColumns
*
* @since Java Persistence 1.0
*/
@Target({METHOD, FIELD})
@Retention(RUNTIME)
public @interface JoinTable {
/**
* (Optional) The name of the join table.
*
* Defaults to the concatenated names of
* the two associated primary entity tables,
* separated by an underscore.
*/
String name() default "";
/** (Optional) The catalog of the table.
*
Defaults to the default catalog.
*/
String catalog() default "";
/** (Optional) The schema of the table.
*
Defaults to the default schema for user.
*/
String schema() default "";
/**
* (Optional) The foreign key columns
* of the join table which reference the
* primary table of the entity owning the
* association. (I.e. the owning side of
* the association).
*
*
Uses the same defaults as for {@link JoinColumn}.
*/
JoinColumn[] joinColumns() default {};
/**
* (Optional) The foreign key columns
* of the join table which reference the
* primary table of the entity that does
* not own the association. (I.e. the
* inverse side of the association).
*
*
Uses the same defaults as for {@link JoinColumn}.
*/
JoinColumn[] inverseJoinColumns() default {};
/**
* (Optional) Unique constraints that are
* to be placed on the table. These are
* only used if table generation is in effect.
*
Defaults to no additional constraints.
*/
UniqueConstraint[] uniqueConstraints() default {};
}