import java.awt.HeadlessException;
import java.sql.Connection;
import java.sql.DriverManager;
import java.sql.SQLException;
import javax.swing.JOptionPane;

public class ConnectDb
{
    public static Connection connectDb()
    {
        try
        {
            Class.forName("oracle.jdbc.driver.OracleDriver");
        }
        catch (ClassNotFoundException e)
        {
            JOptionPane.showMessageDialog(null, e);
        }
        try
        {
            Connection conn = DriverManager.getConnection("jdbc:oracle:thin:@127.0.0.1:1521:ORA2015","grX_login","hasło");
            return conn;
        }
        catch (SQLException | HeadlessException e)
        {
            JOptionPane.showMessageDialog(null, "Brak połaczenia z bazą danych!");
        }
        return null;
    }
}