Connection conn= null;
			try {
			Class.forName("com.mysql.jdbc.Driver");
			String url="jdbc:mysql://127.0.0.1:3306/libreria";
			String username="root";
			String password="";
			conn= DriverManager.getConnection(url, username, password);
			}catch(Exception exx) {
				System.out.println("s");
			}