update a row using spring jdbctemplate

I am new to spring. I am developing a CRUD application using spring jdbc template. I am done with insert and select. but in update am facing some problem. can anybody provide me a simple example of update and delete using jdbctemplate. thnks in advance.

MY CONTROLLER-

@RequestMapping(method = RequestMethod.GET)
    public String showUserForm(@ModelAttribute(value="userview")  User user,ModelMap model)
    {
        List list=userService.companylist();
        model.addAttribute("list",list);
        return "viewCompany";
    }

@RequestMapping( method = RequestMethod.POST)
public String add(@ModelAttribute(value="userview") @Valid User user, BindingResult result) 
{
    userValidator.validate(user, result);
    if (result.hasErrors()) {
        return "viewCompany";
    } else {
        userService.updateCompany(user);
        System.out.println("value updated");
        return "updateSuccess";
    }

when i click on update button the edited values should be updated in my DB according to the row ID , my problem is how to map the row id from jsp to controller.