javax.persistence

Annotation Type JoinTable

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

Specifies the mapping of associations. It is applied to 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 Also:

JoinColumn, JoinColumns

Since:

Java Persistence 1.0

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element and Description
java.lang.String	catalog (Optional) The catalog of the table.
ForeignKey	foreignKey (Optional) Used to specify or control the generation of a foreign key constraint for the columns corresponding to the joinColumns element when table generation is in effect.
Index[]	indexes (Optional) Indexes for the table.
ForeignKey	inverseForeignKey (Optional) Used to specify or control the generation of a foreign key constraint for the columns corresponding to the inverseJoinColumns element when table generation is in effect.
JoinColumn[]	inverseJoinColumns (Optional) The foreign key columns of the join table which reference the primary table of the entity that does not own the association.
JoinColumn[]	joinColumns (Optional) The foreign key columns of the join table which reference the primary table of the entity owning the association.
java.lang.String	name (Optional) The name of the join table.
java.lang.String	schema (Optional) The schema of the table.
UniqueConstraint[]	uniqueConstraints (Optional) Unique constraints that are to be placed on the table.

Element Detail

name

public abstract java.lang.String name

(Optional) The name of the join table.

Defaults to the concatenated names of the two associated primary entity tables, separated by an underscore.

Default:

""

catalog

public abstract java.lang.String catalog

(Optional) The catalog of the table.

Defaults to the default catalog.

Default:

""

schema

public abstract java.lang.String schema

(Optional) The schema of the table.

Defaults to the default schema for user.

Default:

""

joinColumns

public abstract JoinColumn[] joinColumns

(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 JoinColumn.

Default:

{}

inverseJoinColumns

public abstract JoinColumn[] inverseJoinColumns

(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 JoinColumn.

Default:

{}

foreignKey

public abstract ForeignKey foreignKey

(Optional) Used to specify or control the generation of a foreign key constraint for the columns corresponding to the joinColumns element when table generation is in effect. If both this element and the foreignKey element of any of the joinColumns 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)

inverseForeignKey

public abstract ForeignKey inverseForeignKey

(Optional) Used to specify or control the generation of a foreign key constraint for the columns corresponding to the inverseJoinColumns element when table generation is in effect. If both this element and the foreignKey element of any of the inverseJoinColumns 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)

uniqueConstraints

public abstract UniqueConstraint[] uniqueConstraints

(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.

Default:

{}

indexes

public abstract Index[] indexes

(Optional) Indexes for the table. These are only used if table generation is in effect.

Since:

Java Persistence 2.1

Default:

{}