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.resource.adapter.jdbc.ValidConnectionChecker;
30:
31: /**
32: * Checks a PostgreSQL to see if it is alive. Uses an empty query.
33: *
34: * @author <a href="mike@middlesoft.co.uk">Michael Barker</a>
35: * @author <a href="weston.price@jboss.com">Weston Price</a>
36: */
37: public class PostgreSQLValidConnectionChecker implements
38: ValidConnectionChecker, Serializable
39:
40: {
41: private static final long serialVersionUID = 4867167301823753925L;
42:
43: /**
44: * @see org.jboss.resource.adapter.jdbc.ValidConnectionChecker#isValidConnection(java.sql.Connection)
45: */
46: public SQLException isValidConnection(Connection cn) {
47: SQLException ex = null;
48: Statement stmt = null;
49: try {
50: stmt = cn.createStatement();
51: stmt.execute("");
52: } catch (SQLException e) {
53: ex = e;
54: } finally {
55: if (stmt != null) {
56: try {
57: stmt.close();
58: } catch (Exception e) {
59: }
60: }
61: }
62: return ex;
63: }
64: }
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