/*
   Copyright (C) 2002 MySQL AB
   
      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; either version 2 of the License, or
      (at your option) any later version.
   
      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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
      
 */
 
package com.mysql.jdbc.util;

import java.sql.DriverManager;
import java.sql.ResultSet;

import com.mysql.jdbc.TimeUtil;

/**
 * Dumps the timezone of the MySQL server represented by the 
 * JDBC url given on the commandline (or localhost/test if 
 * none provided).
 * 
 * @author Mark Matthews
 */
public class TimezoneDump {

    private static final String DEFAULT_URL = "jdbc:mysql:///test";
    
	/**
	 * Constructor for TimezoneDump.
	 */
	public TimezoneDump() {
		super();
	}

    /**
     * Entry point for program when called from the command line.
     * 
     * @param args command-line args. Arg 1 is JDBC URL.
     * @throws Exception if any errors occur
     */
	public static void main(String[] args) throws Exception {
        String jdbcUrl = DEFAULT_URL;
        
        if (args.length == 1 && args[0] != null) {
            jdbcUrl = args[0];
        }
        
        Class.forName("com.mysql.jdbc.Driver").newInstance();
        ResultSet rs = DriverManager.getConnection(jdbcUrl).createStatement().executeQuery("SHOW VARIABLES LIKE 'timezone'");
        
        while (rs.next()) {
            String timezoneFromServer = rs.getString(2);
            System.out.println("MySQL timezone name: " + timezoneFromServer);
            
            String canonicalTimezone = TimeUtil.getCanoncialTimezone(timezoneFromServer);
            System.out.println("Java timezone name: " + canonicalTimezone);
        }
        
	}
}