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JDBC Type 4 driver for MySQL
/*
* Copyright (c) 2002, 2018, Oracle and/or its affiliates. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify it under
* the terms of the GNU General Public License, version 2.0, as published by the
* Free Software Foundation.
*
* This program is also distributed with certain software (including but not
* limited to OpenSSL) that is licensed under separate terms, as designated in a
* particular file or component or in included license documentation. The
* authors of MySQL hereby grant you an additional permission to link the
* program and your derivative works with the separately licensed software that
* they have included with MySQL.
*
* Without limiting anything contained in the foregoing, this file, which is
* part of MySQL Connector/J, is also subject to the Universal FOSS Exception,
* version 1.0, a copy of which can be found at
* http://oss.oracle.com/licenses/universal-foss-exception.
*
* 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, version 2.0,
* 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.cj.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() {
}
@Override
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
}
}
}
}
}