Java tutorial
/******************************************************************************* * Copyright (c) 2008 - 2013 Oracle Corporation. All rights reserved. * * This program and the accompanying materials are made available under the * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0 * which accompanies this distribution. * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html * and the Eclipse Distribution License is available at * http://www.eclipse.org/org/documents/edl-v10.php. * * Contributors: * Linda DeMichiel - Java Persistence 2.1 * Linda DeMichiel - Java Persistence 2.0 * ******************************************************************************/ package javax.persistence; /** * Defines the types of primary key generation strategies. * * @see GeneratedValue * * @since Java Persistence 1.0 */ public enum GenerationType { /** * Indicates that the persistence provider must assign * primary keys for the entity using an underlying * database table to ensure uniqueness. */ TABLE, /** * Indicates that the persistence provider must assign * primary keys for the entity using a database sequence. */ SEQUENCE, /** * Indicates that the persistence provider must assign * primary keys for the entity using a database identity column. */ IDENTITY, /** * Indicates that the persistence provider should pick an * appropriate strategy for the particular database. The * <code>AUTO</code> generation strategy may expect a database * resource to exist, or it may attempt to create one. A vendor * may provide documentation on how to create such resources * in the event that it does not support schema generation * or cannot create the schema resource at runtime. */ AUTO }