UniqueConstraint (EclipseLink 2.6.1, API Reference)

@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
  
  Required Elements
  Modifier and Type Required Element and Description
  
  java.lang.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
  
  java.lang.String name
  (Optional) Constraint name.

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

Optional Elements
Modifier and Type	Optional Element and Description
`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:
    
    ""

Annotation Type UniqueConstraint

Required Element Summary

Optional Element Summary

Element Detail

columnNames

name