/*******************************************************************************
 * Copyright (c) 1998, 2009 Oracle. 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.
 * 
 * The API for this class and its comments are derived from the JPA 2.0 specification 
 * which is developed under the Java Community Process (JSR 317) and is copyright 
 * Sun Microsystems, Inc. 
 *
 * Contributors:
 *     dclarke - Java Persistence 2.0 - Proposed Final Draft (March 13, 2009)
 *               Specification and licensing terms available from
 *               http://jcp.org/en/jsr/detail?id=317
 *
 * EARLY ACCESS - PUBLIC DRAFT
 * This is an implementation of an early-draft specification developed under the 
 * Java Community Process (JCP) and is made available for testing and evaluation 
 * purposes only. The code is not compatible with any specification of the JCP.
 ******************************************************************************/

package javax.persistence;

import java.lang.annotation.Target;
import java.lang.annotation.Retention;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;

/** 
 * This annotation is used to specify the mapping of the result 
 * of a native SQL query.
 *
 * <pre>
 *    Example:
 *
 *    Query q = em.createNativeQuery(
 *        "SELECT o.id AS order_id, " +
 *            "o.quantity AS order_quantity, " +
 *            "o.item AS order_item, " +
 *            "i.name AS item_name, " +
 *        "FROM Order o, Item i " +
 *        "WHERE (order_quantity > 25) AND (order_item = i.id)",
 *    "OrderResults");
 *    
 *    &#064;SqlResultSetMapping(name="OrderResults", 
 *        entities={ 
 *            &#064;EntityResult(entityClass=com.acme.Order.class, fields={
 *                &#064;FieldResult(name="id", column="order_id"),
 *                &#064;FieldResult(name="quantity", column="order_quantity"), 
 *                &#064;FieldResult(name="item", column="order_item")})},
 *        columns={
 *            &#064;ColumnResult(name="item_name")}
 *    )
 * </pre>
 *
 * @since Java Persistence 1.0 API
 */
@Target({TYPE}) 
@Retention(RUNTIME)
public @interface SqlResultSetMapping { 

    /** 
     * The name given to the result set mapping, and used to refer 
     * to it in the methods of the {@link Query} API.
     */
    String name(); 

    /** Specifies the result set mapping to entities. */
    EntityResult[] entities() default {};

    /** Specifies the result set mapping to scalar values. */
    ColumnResult[] columns() default {};
}