Copyright (c) 2008 - 2014 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
/*******************************************************************************
 * Copyright (c) 2008 - 2014 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;

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

Used in conjunction with the SqlResultSetMapping annotation to map the SELECT clause of a SQL query to an entity result. 
If this annotation is used, the SQL statement should select 
all of the columns that are mapped to the entity object. 
This should include foreign key columns to related entities. 
The results obtained when insufficient data is available 
are undefined.
  Example:
  Query q = em.createNativeQuery(
      "SELECT o.id, o.quantity, o.item, i.id, i.name, i.description "+
          "FROM Order o, Item i " +
          "WHERE (o.quantity > 25) AND (o.item = i.id)",
      "OrderItemResults");
  @SqlResultSetMapping(name="OrderItemResults",
      entities={
          @EntityResult(entityClass=com.acme.Order.class),
          @EntityResult(entityClass=com.acme.Item.class)
  })

See Also:
SqlResultSetMapping
Since:
Java Persistence 1.0/**
 * Used in conjunction with the {@link SqlResultSetMapping} annotation to map the SELECT
 * clause of a SQL query to an entity result.
 *
 * <p>If this annotation is used, the SQL statement should select 
 * all of the columns that are mapped to the entity object. 
 * This should include foreign key columns to related entities. 
 * The results obtained when insufficient data is available 
 * are undefined.
 *
 * <pre>
 *   Example:
 *
 *   Query q = em.createNativeQuery(
 *       "SELECT o.id, o.quantity, o.item, i.id, i.name, i.description "+
 *           "FROM Order o, Item i " +
 *           "WHERE (o.quantity &gt; 25) AND (o.item = i.id)",
 *       "OrderItemResults");
 *   &#064;SqlResultSetMapping(name="OrderItemResults",
 *       entities={
 *           &#064;EntityResult(entityClass=com.acme.Order.class),
 *           &#064;EntityResult(entityClass=com.acme.Item.class)
 *   })
 * </pre>
 *
 * @see SqlResultSetMapping
 *
 * @since Java Persistence 1.0
 */
@Target({}) 
@Retention(RUNTIME)
public @interface EntityResult { 

    
The class of the result. /** The class of the result. */
    Class entityClass(); 

    
Maps the columns specified in the SELECT list of the 
query to the properties or fields of the entity class. 
/** 
     * Maps the columns specified in the SELECT list of the 
     * query to the properties or fields of the entity class. 
     */
    FieldResult[] fields() default {};

    
Specifies the column name (or alias) of the column in 
the SELECT list that is used to determine the type of 
the entity instance.
/** 
     * Specifies the column name (or alias) of the column in 
     * the SELECT list that is used to determine the type of 
     * the entity instance.
     */
    String discriminatorColumn() default "";
}