NetSago Paste

DataBase db;
ResultSet rs;
    
public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException 
{          
    String res3 = "<html>";
    res3 += "<head>";
    res3 += "<title></title>";
    res3 += "<meta http-equiv='Content-Type' content='text/html; charset=windows-1251'>";
    res3 += "</head>";
    res3 += "<body>";
    String login = request.getParameter("login");
    String new_theme = request.getParameter("new_theme");
         
    PrintWriter out = response.getWriter();
         
    db = new DataBase(); 
         
    if (login != "" && new_theme != "")
    {
         db.DoSQLQuery("INSERT INTO theme SET name='"+new_theme+"',id_person=(select id from person where login='"+login+"')");
                 
         res3 += "Theme was added successful<br>";
         res3 += "Close this window<br>";  
        
    }
    else
    {
          res3 += "You didn't input theme's name<br>";
          
    }
    out.println(res3);
}