ObjectDB ObjectDB

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.
(Required) An array of the column names that make up the constraint.
Since:
JPA 1.0
String name
(Optional) Constraint name.
(Optional) Constraint name. A provider-chosen name will be chosen if a name is not specified.
Default value:
""
Since:
JPA 2.0