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

 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 and 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 and Description
  String	name (Optional) Constraint name.

• Element Detail

  • columnNames

    public abstract String[] columnNames

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

• • name

    public abstract String name

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

    Since:

    Java Persistence 2.0

    Default:

    ""