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Java > Open Source Codes > com > sun > jdo > spi > persistence > support > sqlstore > sql > generator > VerificationSelectPlan


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
24 package com.sun.jdo.spi.persistence.support.sqlstore.sql.generator;
25
26 import com.sun.jdo.spi.persistence.support.sqlstore.*;
27 import com.sun.jdo.spi.persistence.support.sqlstore.model.LocalFieldDesc;
28
29 import java.sql.ResultSet JavaDoc;
30 import java.sql.SQLException JavaDoc;
31
32
33 /**
34  * Implements Select Plan for verifying clean VC instanses.
35  * @author Mitesh Meswani
36  */
37 public class VerificationSelectPlan extends SelectQueryPlan {
38
39     /**
40      * Creates a new VerificationSelectQueryPlan.
41      *
42      * @param desc The Retrieve descriptor holding constraints
43      * @param store Store manager executing the query.
44      */
45     public VerificationSelectPlan(RetrieveDesc desc, SQLStoreManager store) {
46         super(desc, store, null);
47     }
48
49     /**
50      * There are no real fields to be selected for verification query.
51      * This method just adds the tables for the version field.
52      */
53     protected void processFields() {
54         LocalFieldDesc[] versionFields = config.getVersionFields();
55         for (int i = 0; i < versionFields.length; i++) {
56             LocalFieldDesc versionField = versionFields[i];
57             addTable(versionField);
58         }
59     }
60
61     protected Statement newStatement() {
62         return new SelectOneStatement(store.getVendorType(), this);
63     }
64
65     /**
66      * Checks whether the resultset from a verification query contains atleast
67      * one row.
68      * @param pm This parameter is not used.
69      * @param resultData The resultset containing result from the verification query
70      * @return true if the resultset contains atleast one row false otherwise.
71      * @throws SQLException
72      */
73     public Object JavaDoc getResult(PersistenceManager pm, ResultSet JavaDoc resultData)
74             throws SQLException JavaDoc{
75         boolean verificationSuccessfull = resultData.next();
76         return Boolean.valueOf(verificationSuccessfull);
77     }
78
79 }
80
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