String driver = "com.mysql.jdbc.Driver";		String url = "jdbc:mysql://127.0.0.1:3306/phpdb";		String u = "root";		String p = "sa123456";				try {			Class.forName(driver);			Connection con = DriverManager.getConnection(url,u,p);			if(!con.isClosed()){				System.out.println("链接成功...");				Statement statement = con.createStatement();				String sql = "select * from articles";				String insertSql = "insert into articles(title,content) values(?,?)";				//执行查询操作				ResultSet rs = statement.executeQuery(sql);								PreparedStatement ps = con.prepareStatement(insertSql);				ps.setString(1, "哈哈哈1111");				ps.setString(2, "写入数据成功啦....");				//执行增、删、改操作				ps.executeUpdate();								while(rs.next()){					System.out.println(rs.getString("content"));				}				rs.close();				con.close();			}		} catch (ClassNotFoundException e) {			// TODO Auto-generated catch block			e.printStackTrace();		}