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Java > Open Source Codes > javax > persistence > FetchType


1 /*
2  * The contents of this file are subject to the terms
3  * of the Common Development and Distribution License
4  * (the License). You may not use this file except in
5  * compliance with the License.
6  *
7  * You can obtain a copy of the license at
8  * https://glassfish.dev.java.net/public/CDDLv1.0.html or
9  * glassfish/bootstrap/legal/CDDLv1.0.txt.
10  * See the License for the specific language governing
11  * permissions and limitations under the License.
12  *
13  * When distributing Covered Code, include this CDDL
14  * Header Notice in each file and include the License file
15  * at glassfish/bootstrap/legal/CDDLv1.0.txt.
16  * If applicable, add the following below the CDDL Header,
17  * with the fields enclosed by brackets [] replaced by
18  * you own identifying information:
19  * "Portions Copyrighted [year] [name of copyright owner]"
20  *
21  * Copyright 2006 Sun Microsystems, Inc. All rights reserved.
22  */
23 package javax.persistence;
24
25 /**
26  * Defines strategies for fetching data from the database.
27  * The <code>EAGER</code> strategy is a requirement on the persistence
28  * provider runtime that data must be eagerly fetched. The
29  * <code>LAZY</code> strategy is a hint to the persistence provider
30  * runtime that data should be fetched lazily when it is
31  * first accessed. The implementation is permitted to eagerly
32  * fetch data for which the <code>LAZY</code> strategy hint has been
33  * specified. In particular, lazy fetching might only be
34  * available for {@link Basic} mappings for which property-based
35  * access is used.
36  *
37  * <pre>
38  * Example:
39  * &#064;Basic(fetch=LAZY)
40  * protected String getName() { return name; }
41  * </pre>
42  *
43  * @since Java Persistence 1.0
44  */
45 public enum FetchType {
46
47     /** Defines that data can be lazily fetched */
48     LAZY,
49
50     /** Defines that data must be eagerly fetched */
51     EAGER
52 }
53
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