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//$Id: GenerationType.java 11282 2007-03-14 22:05:59Z epbernard $
//EJB3 Specification Copyright 2004-2006 Sun Microsystems, Inc.
package javax.persistence;

/**
 * Defines the types of primary key generation.
 *
 * @author Emmanuel Bernard
 */
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 database
         * sequence column.
         */
        SEQUENCE,
        /**
         * Indicates that the persistence provider must assign primary keys for the entity using
         * database identity column.
         */
        IDENTITY,
        /**
         * Indicates that the persistence provider should pick an appropriate strategy for the
         * particular database. The AUTO 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
};