javax.persistence.SequenceGenerator Maven / Gradle / Ivy
// $Id: SequenceGenerator.java 17752 2009-10-15 01:19:21Z [email protected] $
// EJB3 Specification Copyright 2004-2009 Sun Microsystems, Inc.
package javax.persistence;
import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
/**
* Defines a primary key generator that may be referenced by name when
* a generator element is specified for the {@link 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).
*
*
* Example:
*
* @SequenceGenerator(name="EMP_SEQ", allocationSize=25)
*
*
* @since Java Persistence 1.0
*/
@Target({ TYPE, METHOD, FIELD })
@Retention(RUNTIME)
public @interface SequenceGenerator {
/**
* (Required) A unique generator name that can be referenced
* by one or more classes to be the generator for primary key
* values.
*/
String name();
/**
* (Optional) The name of the database sequence object from
* which to obtain primary key values.
* Defaults to a provider-chosen value.
*/
String sequenceName() default "";
/**
* (Optional) The catalog of the sequence generator.
*
* @since Java Persistence 2.0
*/
String catalog() default "";
/**
* (Optional) The schema of the sequence generator.
*
* @since Java Persistence 2.0
*/
String schema() default "";
/**
* (Optional) The value from which the sequence object
* is to start generating.
*/
int initialValue() default 1;
/**
* (Optional) The amount to increment by when allocating
* sequence numbers from the sequence.
*/
int allocationSize() default 50;
}