Java EE 5 SDK

javax.persistence
Annotation Type UniqueConstraint


@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

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.


Java EE 5 SDK

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