DatabaseMetaData 獲取mysql表和字段注釋

	     Properties props =new Properties();
		props.put("user", "root");  
		props.put("password", "root");  
		props.put("useInformationSchema","true"); //表注釋

		Connection con = null;
		try {
			Class.forName("com.mysql.jdbc.Driver");
			con = DriverManager.getConnection("jdbc:mysql://133.96.46.13:3306/test?useUnicode=true&characterEncoding=utf-8", props);
		} catch (SQLException e1) {
			e1.printStackTrace();
		} catch (ClassNotFoundException e) {
			e.printStackTrace();
		}