UniqueConstraint (wtfbd 1.0-RELEASE API)

@Target(TYPE)
@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 Detail
  - columnNames
```
String[] columnNames
```
    (Required) An array of the column names that make up the constraint.
    
    Returns:
    
    col names
- - name
```
String name
```
    (Optional) Constraint name. A provider-chosen name will be chosen if a name is not specified.
    
    Returns:
    
    name
    
    Since:
    
    Java Persistence 2.0
    
    Default:
    
    ""