对数据库进行增删改查操作

改：

        Connection connection=null;
		PreparedStatement ps=null;
		ResultSet rs=null;
		
		Scanner scanner = new Scanner(System.in);
		System.out.println("请输入要修改的信息的用户名：");
		String u=scanner.nextLine();
		System.out.println("请输入要修改的信息的密码：");
		String p=scanner.nextLine();
		
		try {
			Class.forName("com.mysql.jdbc.Driver");
			connection=DriverManager.getConnection("jdbc:mysql://localhost:3306/jiejie","root","root");
			ps=connection.prepareStatement("update u_p set pw=? where username=?");
			ps.setString(1,u );
			ps.setString(2, p);
			ps.executeUpdate();
		} catch (Exception e) {
			// TODO Auto-generated catch block
			e.printStackTrace();
		}