About join

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JPA Doc
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JoinColumn.unique

specify this for a join column that corresponds to a primary key that is part of a foreign key. Default value: false Since: JPA 1.0
JPA Doc
3

JoinColumns.value

Annotation Element javax.persistence.JoinColumns JoinColumn[] value The join columns that map the relationship. Since: JPA 1.0
JPA Doc
3

JoinTable.inverseJoinColumns

Annotation Element javax.persistence.JoinTable 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 value: {} Since: JPA 1.0
JPA Doc
3

JoinTable.joinColumns

Annotation Element javax.persistence.JoinTable 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 value: {} Since: JPA 1.0
JPA Doc
3

JoinTable.name

Annotation Element javax.persistence.JoinTable 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 value: "" Since: JPA 1.0
JPA Doc
3

JoinType.INNER

Enum Constant javax.persistence.criteria.JoinType INNER Inner join. Since: JPA 2.0
JPA Doc
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JoinType.LEFT

Enum Constant javax.persistence.criteria.JoinType LEFT Left outer join. Since: JPA 2.0
JPA Doc
3

JoinType.RIGHT

Enum Constant javax.persistence.criteria.JoinType RIGHT Right outer join. Since: JPA 2.0
JDO Doc
3

Key.generateForeignKey

Annotation Element javax.jdo.annotations.Key String generateForeignKey Generate or assume a foreign key constraint exists on the column or columns associated with this join. Specify "true" or "false". Returns: whether to generate or assume a foreign key constraint Default value: "" Since: JDO 2.1
JDO Doc
3

Key.serialized

Annotation Element javax.jdo.annotations.Key String serialized Whether the key is to be stored serialized (into a single column of a join table). Returns: whether the key is to be stored serialized Default value: "" Since: JDO 2.1