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javax.persistence
Annotation Type UniqueConstraint

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

This annotation is used to specify 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

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Required Element Summary
String[]	columnNames (Required) An array of the column names that make up the constraint.

Element Detail

columnNames

public abstract String[] columnNames

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

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