//таблица  t1 с двумя колонками - num (числа) и str (строки) 

		try {

			Connection con = DriverManager.getConnection(args[0]);


			System.out.println("Connection attempt successful");


			PreparedStatement stmt0;

			PreparedStatement stmt;


			stmt0 = con.prepareStatement("INSERT INTO t1 VALUES (?, 'ZZZ')");

			stmt0.setObject(1, null);

			int nInserted = stmt0.executeUpdate();

			System.err.println("inserted: " + nInserted); 

			stmt0.close();
	

			stmt = con.prepareStatement("SELECT * FROM t1 WHERE str='ZZZ'");

		

			ResultSet rs = stmt.executeQuery();

			printResults (rs);


			con.close();



		} catch (SQLException e) {

			System.err.println("Connection failed(SQLException)");

			System.err.println(e.getMessage());

		}


	}



	static void printResults(ResultSet res) {

		System.out.println(" num | str");

		System.out.println("---------+--------------------------");


		try {

			while (res.next()) {

				String val;

				

				Integer i = res.getInt(1);

				if (res.wasNull()) {

					val = ("NULL");

				} else {

					val = Integer.toString(i.intValue());

				}

					

				System.out.print(val);

				System.out.print(" | ");



				String s = res.getString(2);

				if (res.wasNull())

					val = "(null)";

				else

					val = s;



				System.out.print(val);

				System.out.println("");

			}

		} catch (SQLException e) {

			System.err.println("Fetch failed: " + e.getMessage());

		}

	}