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Java > Open Source Codes > com > lutris > appserver > server > sessionEnhydra > persistent > SizeQuery


1
2 /*
3  * Enhydra Java Application Server Project
4  *
5  * The contents of this file are subject to the Enhydra Public License
6  * Version 1.1 (the "License"); you may not use this file except in
7  * compliance with the License. You may obtain a copy of the License on
8  * the Enhydra web site ( http://www.enhydra.org/ ).
9  *
10  * Software distributed under the License is distributed on an "AS IS"
11  * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
12  * the License for the specific terms governing rights and limitations
13  * under the License.
14  *
15  * The Initial Developer of the Enhydra Application Server is Lutris
16  * Technologies, Inc. The Enhydra Application Server and portions created
17  * by Lutris Technologies, Inc. are Copyright Lutris Technologies, Inc.
18  * All Rights Reserved.
19  *
20  * Contributor(s):
21  *
22  * $Id: SizeQuery.java,v 1.2 2005/03/24 10:51:20 slobodan Exp $
23  */
24
25 package com.lutris.appserver.server.sessionEnhydra.persistent;
26
27 import java.sql.PreparedStatement JavaDoc;
28 import java.sql.ResultSet JavaDoc;
29 import java.sql.SQLException JavaDoc;
30
31 import com.lutris.appserver.server.sql.DBConnection;
32 import com.lutris.appserver.server.sql.Query;
33
34 /**
35  * Queries the total number of sessions in the database.
36  *
37  * @version $Revision: 1.2 $
38  * @author Kyle Clark
39  */
40 class SizeQuery implements Query {
41
42     private String JavaDoc sessionKey;
43     private static final Integer JavaDoc zero = new Integer JavaDoc(0);
44
45     SizeQuery() {
46     }
47
48     /**
49      * Method to query objects from the database.
50      *
51      * @param conn Handle to database connection.
52      * @exception java.sql.SQLException If a database access error occurs.
53      */
54     public ResultSet JavaDoc executeQuery(DBConnection conn)
55         throws SQLException JavaDoc {
56         String JavaDoc sql = "select count (*) totalSessions from "
57             + PersistentSessionHome.dbTableName;
58         PreparedStatement JavaDoc stmt = conn.prepareStatement(sql);
59         return conn.executeQuery(stmt, sql);
60     }
61
62     /**
63      * Method that returns the number of sessions.
64      *
65      * @param rs
66      * result set from which the number of sessions
67      * will be instantiated.
68      * @return an Integer representing the number of sessions.
69      * @exception SQLException If a database access error occurs.
70      */
71     public Object JavaDoc next(ResultSet JavaDoc rs) throws SQLException JavaDoc {
72         if (rs.next()) {
73             return new Integer JavaDoc(rs.getInt("totalSessions"));
74         }
75         return zero;
76     }
77
78 }
79
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