/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 */
package jdbcukol;

import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.Random;
import java.util.logging.Level;
import java.util.logging.Logger;


class Ukol1
{
    Connection con;

    public Ukol1() {
        con = getConnection();

        Statement stm;
        try {
            stm = con.createStatement();

            ResultSet rs = stm.executeQuery("select * from products");

            Random rand = new Random();

            int num = rand.nextInt(50);

            rs.absolute(num);
            rs.next();

            int x = rs.getInt("products_quantity");

            System.out.println(num + ". " + x);

            x += 100;

            stm.execute("UPDATE PRODUCTS SET PRODUCTS_QUANTITY=" + x + " WHERE products_id=" + num);

            ResultSet rs2 = stm.executeQuery("select * from products");

            rs2.absolute(num);
            rs2.next();

            x = rs2.getInt("products_quantity");

            System.out.println(num + ". " + x);

            con.close();

        } catch (SQLException ex) {
            Logger.getLogger(Ukol1.class.getName()).log(Level.SEVERE, null, ex);
        }

    }


    public static Connection getConnection(){
	Connection con = null;
	try {
		con = DriverManager.getConnection(
				"jdbc:mysql://pca1035a.vsb.cz/shop", "shop", "shop");
	} catch (SQLException e) {

	}
	return con;
    }
}

/**
 *
 * @author tomas
 */
public class JDBCukol {




    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        try {
            // TODO code application logic here
            Class.forName("com.mysql.jdbc.Driver");
        } catch (ClassNotFoundException ex) {
            Logger.getLogger(JDBCukol.class.getName()).log(Level.SEVERE, null, ex);
        }

        Ukol1 u1 = new Ukol1();


    }
}