Note: This ORM/SQL annotation is silently ignored by ObjectDB

117 words

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

This documentation page is derived (with some adjustments) from the open source JPA 2 RI (EclipseLink)
and is available under the terms of the Eclipse Public License, v. 1.0 and Eclipse Distribution License, v. 1.0.
Object Relational Mapping (ORM) JPA 2 providers include Hibernate, EclipseLink, TopLink, OpenJPA and DataNucleus.
Object DB is not an ORM JPA implementation but an Object Database for Java with built in JPA 2 support.