MapKeyColumn.unique - JPA annotation element
Annotation Element javax.persistence.MapKeyColumn
boolean unique
(Optional) Whether the column is a unique key. This is a shortcut for the
UniqueConstraint annotation at the table level and is useful for when the unique key constraint corresponds to only a single column. This constraint applies in addition to any constraint entailed by primary key mapping and to constraints specified at the table level. - Default value:
- false
- Since:
- JPA 2.0
