01: /*
02: * JBoss, Home of Professional Open Source.
03: * Copyright 2006, Red Hat Middleware LLC, and individual contributors
04: * as indicated by the @author tags. See the copyright.txt file in the
05: * distribution for a full listing of individual contributors.
06: *
07: * This is free software; you can redistribute it and/or modify it
08: * under the terms of the GNU Lesser General Public License as
09: * 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.vendor;
23:
24: import java.io.Serializable;
25: import java.sql.Connection;
26: import java.sql.SQLException;
27: import java.sql.Statement;
28:
29: import org.jboss.logging.Logger;
30: import org.jboss.resource.adapter.jdbc.ValidConnectionChecker;
31:
32: /**
33: * A MSSQLValidConnectionChecker.
34: *
35: * @author <a href="weston.price@jboss.com">Weston Price</a>
36: * @version $Revision: 57189 $
37: */
38: public class MSSQLValidConnectionChecker implements
39: ValidConnectionChecker, Serializable {
40: private static final String QUERY = "SELECT x";
41: private static final Logger log = Logger
42: .getLogger(MSSQLValidConnectionChecker.class);
43:
44: /** The serialVersionUID */
45: private static final long serialVersionUID = 3995516551833725723L;
46:
47: public SQLException isValidConnection(final Connection c) {
48: SQLException sqe = null;
49: Statement stmt = null;
50:
51: try {
52: stmt = c.createStatement();
53: stmt.execute(QUERY);
54: }
55:
56: catch (SQLException e) {
57: log
58: .warn("warning: connection validation failed for current managed connection.");
59: sqe = e;
60: } finally {
61: try {
62: if (stmt != null) {
63: stmt.close();
64:
65: }
66: } catch (SQLException e) {
67: log.warn("simple close failed for managed connection",
68: e);
69:
70: }
71:
72: }
73:
74: return sqe;
75: }
76:
77: }
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