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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.
 *
 *  *    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")}
 *    )
 * 
 *
 * @since Java Persistence 1.0
 */
@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 {};
}