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//$Id: SequenceGenerator.java 11282 2007-03-14 22:05:59Z epbernard $
//EJB3 Specification Copyright 2004-2006 Sun Microsystems, Inc.
package javax.persistence;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;
import static java.lang.annotation.ElementType.*;
import static java.lang.annotation.RetentionPolicy.*;
/**
* This annotation defines a primary key generator that may be referenced by name when a generator
* element is specified for the GeneratedValue annotation. A sequence generator may be specified on
* the entity class or on the primary key field or property. The scope of the generator name is global
* to the persistence unit (across all generator types).
*
* @author Emmanuel Bernard
*/
@
Target({TYPE, METHOD, FIELD
}) @
Retention(RUNTIME
)
public @
interface SequenceGenerator
{
/**
* A unique generator name that can be referenced by one or more classes to be the generator for primary key values
*/
String name
();
/**
* The name of the database sequence object from which to obtain primary key values
* Defaults to a provider-chosen value
*/
String sequenceName
() default "";
/**
* The value from which the sequence object is to start generating
*/
int initialValue
() default 1;
/**
* The amount to increment by when allocating sequence numbers from the sequence
*/
int allocationSize
() default 50;
}