com.github.drinkjava2.jdialects.annotation.jpa.SequenceGenerator Maven / Gradle / Ivy

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/*
 * License: GNU Lesser General Public License (LGPL), version 2.1 or later. See
 * the lgpl.txt file in the root directory or
 * .
 */
package com.github.drinkjava2.jdialects.annotation.jpa;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * 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, 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;
}