javax.persistence.UniqueConstraint - JPA annotation
javax.persistence
Annotation UniqueConstraint
- Target:
Specifies that a unique constraint is to be included in the generated DDL for a primary or secondary table.
Example:
@Entity @Table( name="EMPLOYEE", uniqueConstraints= @UniqueConstraint(columnNames={"EMP_ID", "EMP_NAME"}) ) public class Employee { ... }
- Since:
- JPA 1.0
String[] columnNames
(Required) An array of the column names that make up the constraint.
- Since:
- JPA 1.0
String name
(Optional) Constraint name. A provider-chosen name will be chosen if a name is not specified.
- Default value:
- ""
- Since:
- JPA 2.0