DB2ValidConnectionChecker.java

/*
 * IronJacamar, a Java EE Connector Architecture implementation
 * Copyright 2010, Red Hat Inc, and individual contributors
 * as indicated by the @author tags. See the copyright.txt file in the
 * distribution for a full listing of individual contributors.
 *
 * This is free software; you can redistribute it and/or modify it
 * under the terms of the Eclipse Public License 1.0 as
 * published by the Free Software Foundation.
 *
 * This software 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 Eclipse
 * Public License for more details.
 *
 * You should have received a copy of the Eclipse Public License
 * along with this software; if not, write to the Free
 * Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301 USA, or see the FSF site: http://www.fsf.org.
 */

package org.ironjacamar.adapters.jdbc.extensions.db2;

import org.ironjacamar.adapters.jdbc.spi.ValidConnectionChecker;

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

/**
 * A DB2ValidConnectionChecker.
 *
 * @author <a href="wprice@redhat.com">Weston Price</a>
 * @version $Revision: 71554 $
 */
public class DB2ValidConnectionChecker implements ValidConnectionChecker, Serializable
{
   /** The serialVersionUID */
   private static final long serialVersionUID = -1256537245822198702L;

   /** The VALID_QUERY */
   private static final String VALID_QUERY = "SELECT CURRENT TIMESTAMP FROM SYSIBM.SYSDUMMY1";

   /**
    * Constructor
    */
   public DB2ValidConnectionChecker()
   {
   }

   /**
    * {@inheritDoc}
    */
   @Override
   public SQLException isValidConnection(final Connection c)
   {
      SQLException theResult = null;
      Statement s = null;

      try
      {
         s = c.createStatement();
         s.execute(VALID_QUERY);
      }
      catch (SQLException e)
      {
         theResult = e;
      }
      finally
      {
         try
         {
            if (s != null)
               s.close();
         }
         catch (SQLException e)
         {
            // Ignore
         }
      }

      return theResult;
   }
}