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 Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.

  The MySQL Connector/J is licensed under the terms of the GPLv2
  <http://www.gnu.org/licenses/old-licenses/gpl-2.0.html>, like most MySQL Connectors.
  There are special exceptions to the terms and conditions of the GPLv2 as it is applied to
  this software, see the FLOSS License Exception

  This program is free software; you can redistribute it and/or modify it under the terms
  of the GNU General Public License as published by the Free Software Foundation; version 2
  of the License.

  This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
  without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
  See the GNU General Public License for more details.

  You should have received a copy of the GNU General Public License along with this
  program; if not, write to the Free Software Foundation, Inc., 51 Franklin St, Fifth
  Floor, Boston, MA 02110-1301  USA

package com.mysql.jdbc.integration.jboss;

import java.io.Serializable;
import java.sql.Connection;
import java.sql.SQLException;
import java.sql.Statement;

import org.jboss.resource.adapter.jdbc.ValidConnectionChecker;

 * A more efficient connection checker for JBoss.
 * @version $Id: MysqlValidConnectionChecker.java,v 2005/05/13 18:58:42
 *          mmatthews Exp $
00039 public final class MysqlValidConnectionChecker implements
            ValidConnectionChecker, Serializable {

      private static final long serialVersionUID = 8909421133577519177L;

      public MysqlValidConnectionChecker() {

       * (non-Javadoc)
       * @see org.jboss.resource.adapter.jdbc.ValidConnectionChecker#isValidConnection(java.sql.Connection)
      public SQLException isValidConnection(Connection conn) {

            // Use "/* ping */ SELECT 1" which will send
            // pings across multi-connections too in case the connection
            // was "wrapped" by Jboss in any way...

            Statement pingStatement = null;

            try {
                  pingStatement = conn.createStatement();
                  pingStatement.executeQuery("/* ping */ SELECT 1").close();

                  return null;
            } catch (SQLException sqlEx) {
                  return sqlEx;
            } finally {
                  if (pingStatement != null) {
                        try {
                        } catch (SQLException sqlEx) {
                              // can't do anything about it here

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