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64 lines
2.0 KiB
64 lines
2.0 KiB
7 years ago
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/*
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* Copyright (c) 2008, 2009, 2011 Oracle, Inc. All rights reserved.
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*
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* This program and the accompanying materials are made available under the
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* terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
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* which accompanies this distribution. The Eclipse Public License is available
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* at http://www.eclipse.org/legal/epl-v10.html and the Eclipse Distribution License
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* is available at http://www.eclipse.org/org/documents/edl-v10.php.
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*/
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package com.fr.third.javax.persistence;
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import java.lang.annotation.Retention;
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import java.lang.annotation.Target;
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import static java.lang.annotation.RetentionPolicy.RUNTIME;
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/**
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* Used to map the SELECT clause of a SQL query to an entity result.
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* If this annotation is used, the SQL statement should select
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* all of the columns that are mapped to the entity object.
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* This should include foreign key columns to related entities.
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* The results obtained when insufficient data is available
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* are undefined.
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*
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* <pre>
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* Example:
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*
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* Query q = em.createNativeQuery(
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* "SELECT o.id, o.quantity, o.item, i.id, i.name, i.description "+
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* "FROM Order o, Item i " +
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* "WHERE (o.quantity > 25) AND (o.item = i.id)",
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* "OrderItemResults");
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* @SqlResultSetMapping(name="OrderItemResults",
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* entities={
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* @EntityResult(entityClass=com.acme.Order.class),
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* @EntityResult(entityClass=com.acme.Item.class)
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* })
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* </pre>
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*
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* @see SqlResultSetMapping
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*
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* @since Java Persistence 1.0
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*/
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@Target({})
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@Retention(RUNTIME)
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public @interface EntityResult {
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/** The class of the result. */
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Class entityClass();
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/**
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* Maps the columns specified in the SELECT list of the
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* query to the properties or fields of the entity class.
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*/
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FieldResult[] fields() default {};
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/**
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* Specifies the column name (or alias) of the column in
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* the SELECT list that is used to determine the type of
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* the entity instance.
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*/
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String discriminatorColumn() default "";
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}
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