Package javax.persistence

Annotation Interface UniqueConstraint

@Target({})
@Retention(RUNTIME)
public @interface UniqueConstraint

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:

Java Persistence 1.0

Required Element Summary

Required Elements

Modifier and Type	Required Element	Description
String[]	columnNames	(Required) An array of the column names that make up the constraint.

Optional Element Summary

Optional Elements

Modifier and Type	Optional Element	Description
String	name	(Optional) Constraint name.

Element Details

columnNames

String[] columnNames

(Required) An array of the column names that make up the constraint.

name

String name

(Optional) Constraint name. A provider-chosen name will be chosen if a name is not specified.

Since:

Java Persistence 2.0

Default:

""