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


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: UnusedQuery.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 import java.util.Vector JavaDoc;
31
32 import com.lutris.appserver.server.sql.DBConnection;
33 import com.lutris.appserver.server.sql.ObjectIdException;
34 import com.lutris.appserver.server.sql.Query;
35
36 /**
37  * Returns an unused session.
38  *
39  * @version $Revision: 1.2 $
40  * @author Kyle Clark
41  */
42 class UnusedQuery implements Query {
43
44     UnusedQuery() {
45     }
46
47     /**
48      * Method to query objects from the database.
49      *
50      * @param conn Handle to database connection.
51      * @exception java.sql.SQLException If a database access error occurs.
52      */
53     public ResultSet JavaDoc executeQuery(DBConnection conn)
54         throws SQLException JavaDoc {
55         // TODO - should select the oldest one.
56 String JavaDoc sql = "select sessionKey from "
57             + PersistentSessionHome.dbTableName
58             + " where isNew = ?";
59         PreparedStatement JavaDoc stmt = conn.prepareStatement(sql);
60         stmt.setString(1, "1");
61         return conn.executeQuery(stmt, sql);
62     }
63
64     /**
65      * Method to get next object from query results.
66      *
67      * @param rs JDBC result set from which the next object
68      * will be instantiated.
69      * @exception java.sql.SQLException If a database access error occurs.
70      * @exception ObjectIdException If ObjectId was not found.
71      */
72     public Object JavaDoc next(ResultSet JavaDoc rs) throws SQLException JavaDoc {
73         Vector JavaDoc v = new Vector JavaDoc();
74         if (rs.next()) {
75             return rs.getString("sessionKey");
76         }
77         return null;
78     }
79
80 }
81
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