Vežba 16

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Data;
using System.Data.SqlClient;

namespace Vezba_16_2018
{
    class Database
    {
        public static DataTable ExecuteQuery(string query)
        {
            DataTable dt = new DataTable();
            using (SqlConnection connection = new SqlConnection(Properties.Settings.Default.SportistiConnectionString))
            {
                using (SqlCommand command = new SqlCommand(query, connection))
                {
                    connection.Open();
                    using (SqlDataReader reader = command.ExecuteReader())
                    {
                        dt.Load(reader);
                    }
                }
            }
                return dt;
        }
    }
}




using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace Vezba_16_2018
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void PrikaziSveSportove()
        {
            DataTable dt = Database.ExecuteQuery("SELECT Id, Naziv FROM Sport");
            comboBox1.DataSource = dt;
            comboBox1.DisplayMember = "Naziv";
            comboBox1.ValueMember = "Id";
        }

        private void PrikaziSveKlubove()
        {
            DataTable dt = Database.ExecuteQuery("SELECT Klub.Naziv, Klub.Mesto, Sport.Naziv AS Sport FROM Klub LEFT JOIN Sport ON Klub.SportId = Sport.Id");
            dataGridView1.DataSource = dt;
        }

        private void PrikaziSveSportiste()
        {
            DataTable dt = Database.ExecuteQuery("SELECT Ime, DatumRodjenja, Visina, Tezina, Klub.Naziv AS NazivKluba, Sport.Naziv AS NazivSporta FROM Sportista LEFT JOIN Klub ON Sportista.KlubId = Klub.Id LEFT JOIN Sport ON Klub.SportId = Sport.Id");
            foreach(DataRow dr in dt.Rows)
            {
                ListViewItem item = listView1.Items.Add(dr["Ime"].ToString());
                item.SubItems.Add(dr["DatumRodjenja"].ToString());
                item.SubItems.Add(dr["Visina"].ToString());
                item.SubItems.Add(dr["Tezina"].ToString());
                item.SubItems.Add(dr["NazivKluba"].ToString());
                item.SubItems.Add(dr["NazivSporta"].ToString());
            }
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            PrikaziSveSportove();
            PrikaziSveKlubove();
            PrikaziSveSportiste();
        }
    }
}