データ接続プールの設定を記録

*     
	 */
	private final String c3p0Properties = "jdbc.properties";

	/**
	 *       
	 * @throws IOException       
	 * @throws PropertyVetoException
	 * @see {@link java.beans.PropertyVetoException}}
	 */
	private DBConnection() throws IOException, PropertyVetoException {

		Properties p = new Properties();
		p.load(this.getClass().getResourceAsStream(c3p0Properties));
		ds = new ComboPooledDataSource();
		ds.setDriverClass(p.getProperty("jdbc.driverClassName"));
		ds.setJdbcUrl(p.getProperty("jdbc.url"));
		ds.setUser(p.getProperty("jdbc.username"));
		ds.setPassword(p.getProperty("jdbc.password"));
		ds.setMaxPoolSize(Integer.parseInt(p.getProperty("jdbc.pool.maxsize")));
		ds.setMaxIdleTime(60);
		
	}