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62 lines
2.3 KiB
62 lines
2.3 KiB
/* |
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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 in conjunction with the {@link SqlResultSetMapping} annotation to map |
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* the SELECT clause of a SQL query to a constructor. |
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* <p/> |
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* Applies a constructor for the target class, passing in as arguments values |
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* from the specified columns. All columns corresponding to arguments of the |
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* intended constructor must be specified using the {@code columns} element of the |
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* {@code ConstructorResult} annotation in the same order as that of the argument |
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* list of the constructor. Any entities returned as constructor results will be |
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* in either the new or detached state, depending on whether a primary key is |
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* retrieved for the constructed object. |
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* <p/> |
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* Example: |
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* <pre> |
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* Query q = em.createNativeQuery( |
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* "SELECT c.id, c.name, COUNT(o) as orderCount, AVG(o.price) AS avgOrder " + |
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* "FROM Customer c, Orders o " + |
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* "WHERE o.cid = c.id " + |
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* "GROUP BY c.id, c.name", |
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* "CustomerDetailsResult" |
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* ); |
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* |
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* @SqlResultSetMapping( |
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* name="CustomerDetailsResult", |
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* classes = { |
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* @ConstructorResult( |
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* targetClass=com.acme.CustomerDetails.class, |
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* columns={ |
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* @ColumnResult(name="id"), |
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* @ColumnResult(name="name"), |
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* @ColumnResult(name="orderCount"), |
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* @ColumnResult(name="avgOrder", type=Double.class) |
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* } |
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* ) |
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* } |
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* </pre> |
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*/ |
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@Target(value={}) @Retention(RUNTIME) |
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public @interface ConstructorResult { |
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/** (Required) The class whose constructor is to be invoked. */ |
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Class targetClass(); |
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/** (Required) The mapping of columns in the SELECT list to the arguments of the intended constructor, in order. */ |
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ColumnResult[] columns(); |
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} |
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