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/*
 * Copyright (c) 2008, 2020 Oracle and/or its affiliates. All rights reserved.
 *
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v. 2.0 which is available at
 * http://www.eclipse.org/legal/epl-2.0,
 * or the Eclipse Distribution License v. 1.0 which is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause
 */

// Contributors:
//     Petros Splinakis - 2.2
//     Linda DeMichiel - 2.1
//     Linda DeMichiel - 2.0

package jakarta.persistence;

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

/** 
 * Specifies the mapping of the result of a native SQL query or stored 
 * procedure.
 *
 *  *    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");
 *    
 *    @SqlResultSetMapping(name="OrderResults", 
 *        entities={ 
 *            @EntityResult(entityClass=com.acme.Order.class, fields={
 *                @FieldResult(name="id", column="order_id"),
 *                @FieldResult(name="quantity", column="order_quantity"), 
 *                @FieldResult(name="item", column="order_item")})},
 *        columns={
 *            @ColumnResult(name="item_name")}
 *    )
 * 
 *
 * @see Query
 * @see StoredProcedureQuery
 * @see NamedNativeQuery
 * @see NamedStoredProcedureQuery
 *
 * @since 1.0
 */
@Repeatable(SqlResultSetMappings.class)
@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} and 
     * {@link StoredProcedureQuery} APIs.
     */
    String name(); 

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

    /** 
     * Specifies the result set mapping to constructors. 
     * @since 2.1
     */
    ConstructorResult[] classes() default {};

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