import java.sql.*;

public class PrimoJDBC {

	public static void main(String[] args) {

		Connection conn= null;
		try
		{
			Class.forName("com.mysql.jdbc.Driver");
			String url="jdbc:mysql://127.0.0.1:3306/?user=root";
			String username="root";
			String password="giovanni";
			conn=DriverManager.getConnection(url, username, password);
		}catch(Exception e){
			System.out.println("connessione fallita.");

		}
		try
		{

			Statement query=conn.createStatement();
			ResultSet risultato=query.executeQuery("select * from Libro");
				while(risultato.next()) {
					String isbn= risultato.getString("isbn");
					System.out.println(isbn);
				}

		}
			catch(Exception e)
			{
			System.out.println("errore nell'interrogazione.");
			}
	}

}