MysqlValidConnectionChecker.java
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/*
Copyright (c) 2002, 2014, 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 FOSS License Exception
<http://www.mysql.com/about/legal/licensing/foss-exception.html>.
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.
*/
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 {
pingStatement.close();
} catch (SQLException sqlEx) {
// can't do anything about it here
}
}
}
}
}