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Java > Open Source Codes > org > jboss > resource > adapter > jdbc > CheckValidConnectionSQL


1 /*
2 * JBoss, Home of Professional Open Source
3 * Copyright 2005, JBoss Inc., and individual contributors as indicated
4 * by the @authors tag. See the copyright.txt in the distribution for a
5 * full listing of individual contributors.
6 *
7 * This is free software; you can redistribute it and/or modify it
8 * under the terms of the GNU Lesser General Public License as
9 * published by the Free Software Foundation; either version 2.1 of
10 * the License, or (at your option) any later version.
11 *
12 * This software is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with this software; if not, write to the Free
19 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
20 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
21 */
22 package org.jboss.resource.adapter.jdbc;
23
24 import java.io.Serializable JavaDoc;
25 import java.sql.Connection JavaDoc;
26 import java.sql.Statement JavaDoc;
27 import java.sql.SQLException JavaDoc;
28
29 /**
30  * Implements check valid connection sql
31  *
32  * @author <a HREF="mailto:adrian@jboss.org">Adrian Brock</a>
33  * @version $Revision: 37459 $
34  */
35 public class CheckValidConnectionSQL
36    implements ValidConnectionChecker, Serializable JavaDoc
37 {
38    private static final long serialVersionUID = -222752863430216887L;
39    
40    String JavaDoc sql;
41    
42    public CheckValidConnectionSQL()
43    {
44    }
45
46    public CheckValidConnectionSQL(String JavaDoc sql)
47    {
48       this.sql = sql;
49    }
50
51    public SQLException JavaDoc isValidConnection(Connection JavaDoc c)
52    {
53       try
54       {
55          Statement JavaDoc s = c.createStatement();
56          try
57          {
58             s.execute(sql);
59             return null;
60          }
61          finally
62          {
63             s.close();
64          }
65       }
66       catch (SQLException JavaDoc e)
67       {
68          return e;
69       }
70    }
71 }
72
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