Creating EJB 3.0 Entity Relationships - EJB 3.0 Database Persistence with Oracle Fusion Middleware 11g - page 205

Annotation Description Annotation Elements

@JoinColumn Specifies a mapped column

for joining an association.

name (optional): The name
of the foreign key column.
If the join is for OneToOne
or ManyToOne, the foreign
key column is in the source
entity. If the join is for a
ManyToMany, the foreign
key is in the join table.

referencedColumnName
(optional): The name of the
column referenced by the
foreign key column.

unique (optional): Specifies
if the property is a unique
key. Default value is false.

nullable (optional):
Specifies if the foreign key
column is nullable. Default
value is true.

insertable (optional):
Specifies if the column is
included in the SQL INSERT
statements generated by the
persistence provider. Default
is true.

updatable (optional):
Specifies if the column is
included in the SQL UPDATE
statements generated by the
persistence provider. Default
is true.

columnDefinition
(optional): The SQL
fragment used to generate
the DDL for the column.

table (optional): The name
of the table that contains
the column. Default is
the primary table of the
applicable entity.