Bukkit

package me.tabr.mysqldbconnection;
/* auto config update
 * code improovements 
 * 
 * */
import org.bukkit.Server;
import org.bukkit.configuration.file.FileConfiguration;
import org.bukkit.plugin.Plugin;
import org.bukkit.plugin.java.JavaPlugin;
import java.sql.Connection;
//import java.sql.DatabaseMetaData;
import java.sql.DriverManager;
//import java.sql.ResultSet;
import java.sql.DatabaseMetaData;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
//import java.util.List;
import java.util.ArrayList;
import java.util.List;
import java.util.logging.Level;
import java.util.logging.Logger;

public class MDBCMain extends JavaPlugin
	{
	private static final Logger log = Logger.getLogger("Minecraft");

	private static String dbHost		= null;
	private String dbPort				= null;
	private String dbUser				= null;
	private String dbPassword			= null;
	private String dbDatabase			= null;
	private FileConfiguration config	= null;
	private Connection connection		= null;
	private Statement ownStmt			= null;
	private final int DefaultPingTimeout= 300;
	private final int DefaultMaxColIndex= 32;
	
	private int PingTimeout				= DefaultPingTimeout;
	private int maxColIndex				= DefaultMaxColIndex;

	
	public int executeUpdate(String SQL)
		{
		int res	= 0;
		try
			{
			res		= this.ownStmt.executeUpdate(SQL);
			}
		catch (SQLException e)
			{
			log.info("[mdbc] SQL Exception: "+e);
			}
		return res;
		}

	public ArrayList<ArrayList<String>> executeQuery (String SQL)
		{
		ResultSet res = null;
		ArrayList<ArrayList<String>> data = new ArrayList<ArrayList<String>>();
		try
			{
			res = this.ownStmt.executeQuery(SQL);
//			int size = res.getFetchSize();
			while (res.next())
				{
//				log.info("[1]");
				ArrayList<String> tmp = new ArrayList<String>();
//				log.info("[2]");
				for (int i = 1;i<this.maxColIndex;i++)
					{
//					log.info("[3]");
					try
						{
//						log.info("[4]");
						tmp.add(res.getString(i));
//						log.info("adding...");
						}
					catch (SQLException e)
						{
//						log.info("BREAKING!!");
						//It's ok
						break;
						}
					}
//				log.info("[4]");
				data.add(tmp);
				}
			return data;
			}
		catch (SQLException e)
			{
			log.info("[mdbc] SQL Exception: "+e);
			}
		log.info("[returning]");
		return data;
		}
	public void Test()
		{
		log.log(Level.INFO,"[mdbc] test successfull");
		}
	public boolean tableExists(String table)
		{
		ResultSet res = null;
		boolean bool;
		try
			{
			DatabaseMetaData data = this.connection.getMetaData();
			res = data.getTables(null, null, table, null);

			bool = res.next();
			return bool;
			}
		catch (SQLException e)
			{
			log.log(Level.SEVERE, "[mdbc]: Could not load table " + table + " for: mysql: " + e);
			return false;
			}
		finally//ммм...по идее, сюда не дойдем
			{
			try
				{
				if (res != null)
					{
					res.close();
					}
				}
			catch (Exception e)
				{
				log.log(Level.SEVERE, "[mdbc]: Could not close connection to mysql database: " + e);
				return false;
				} 
			}
		}
	public Statement getStmt()
		{
		try
			{
			return connection.createStatement();
			}
		catch (SQLException e)
			{
			log.log(Level.INFO,"[mdbc] connection create exception: "+e);
			return null;
			}
		}
	
	private void createSampleConfig()
		{
		config.set("host",			"localhost");
		config.set("port",			"3306");
		config.set("database",		"database");
		config.set("user",			"user");
		config.set("password",		"password");
		config.set("PingTimeout",	this.DefaultPingTimeout);
		config.set("maxColIndex",	this.DefaultMaxColIndex);
		this.saveConfig();
		log.info("[mdbc] New config created");
		}
	
	public void onDisable()
		{
        //are there any plugins that depend on me?
        List<String> depend;
        for (Plugin plugin : getServer().getPluginManager().getPlugins()) {
            if (!plugin.isEnabled()) continue;
            depend = (List<String>) plugin.getDescription().getDepend();
            if (depend != null && depend.contains(this.getName())) {
                getServer().getPluginManager().disablePlugin(plugin);
            }
        }
		this.disconnect();
		}
	public void onEnable()
		{
		log.info("[mdbc] starting...");
		this.config	= this.getConfig();
		if (!(this.config.contains("host")))
			{
			this.createSampleConfig();
			}
		dbHost		= this.config.get("host").toString();
		dbPort		= this.config.get("port").toString();
		dbDatabase	= this.config.get("database").toString();
		dbUser		= this.config.get("user").toString();
		dbPassword	= this.config.get("password").toString();
		PingTimeout	= this.config.getInt("PingTimeout");//обезопасить!
		maxColIndex	= this.config.getInt("maxColIndex");//обезопасить!
		if (maxColIndex == 0)//maybe config parameter not set
			{
			config.set("maxColIndex",	this.DefaultMaxColIndex);
			this.saveConfig();
			}
		try
			{
			this.connect();
			ownStmt	= this.getStmt();
			}
		catch (ClassNotFoundException e)
			{
			log.log(Level.INFO,"[mdbc] ClassNotFoundException");
			getServer().getPluginManager().disablePlugin(this);
			return;
			}
		catch (SQLException e)
			{
			log.log(Level.INFO,"[mdbc] SQLException");
			getServer().getPluginManager().disablePlugin(this);
			return;
			}
		pingDBConnection();
		}
	private void pingDBConnection()
		{
		Server BukkitServer	= this.getServer();
		BukkitServer.getScheduler().scheduleSyncDelayedTask(this, new Runnable()
			{
			public void run()
				{
				log.info("ping db connection...");
				try
					{
//					ownStmt.p
					ownStmt.executeUpdate("SHOW TABLES");//hmm....
//					ownStmt.executeUpdate("SELECT 1");//hmm....
					}
				catch (SQLException e)
					{
					log.info("[mcdb] Ping SQLException :"+e);
					}
				pingDBConnection();
				}
			},20*PingTimeout);//5 min
		
		}
	private void disconnect()
		{
		try
			{
			this.ownStmt.close();
			}
		catch (Exception e)
			{
			log.log(Level.INFO,"[mdbc] mysql statement connection close error!"+e);
			}
		try
			{
			this.connection.close();
			}
		catch (Exception e)
			{
			log.log(Level.INFO,"[mdbc] mysql connection close error!"+e);
			}
		}
	private void connect() throws ClassNotFoundException, SQLException
		{
		Class.forName("com.mysql.jdbc.Driver");
		String str		= "jdbc:mysql://"+dbHost+":"+dbPort+"/"+dbDatabase+"?user="+dbUser+"&password="+dbPassword;
		this.connection	= DriverManager.getConnection(str);
		}
	}