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## javax.persistence
Annotation Type UniqueConstraint

    @Target(value={})
    @Retention(value=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
`java.lang.String[]` | `columnNames` (Required) An array of the column names that make up the constraint.

Optional Element Summary
`java.lang.String` | `name` (Optional) Constraint name.

Element Detail

### columnNames

    public abstract java.lang.String[] columnNames

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

### name

    public abstract java.lang.String name

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

  Since:
    Java Persistence 2.0
  Default:
    ""

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