php - Update record in database using codeigniter -

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hi there iam using codeigniter , have managed post id number , phone number table named "offers" both fields int, when try update phone number corresponding specific id see no changes in database. have listed controller , model , view below

newoffer controller

   <?php      if ( ! defined('basepath')) exit('no direct script access allowed');   //insert data db using offer_model model   // other option update submit    class newoffer extends ci_controller {        function addoffer() {        //if form submitted                   $this->load->view("check");        $this->load->model("offer_model");          if ($this->input->post('mysubmit')) {              $this->offer_model->entry_insert();           }        }          function updateoffer (){            $this->load->view("check2");            $this->load->model("offer_model");            if ($this->input->post('mysubmit')) {                 $this->offer_model->upddata();             }          }     }   ?>

offer_model 

class offer_model extends ci_model{   public function entry_insert(){       $data = array(            'idnum' => $this->input->post('idnum'),             'phnenum' => $this->input->post('phnenum'),          );       $this->db->insert('offers',$data);   }     public function upddata($data) {     $this->db->where('idnum', $idnum);     $this->db->update('data' ,$data);     //extract($data);    //$data['offername']   //$this->db->where('offername' ,  $data['offername']);      //$this->db->update($offers, array('offername' => $offername));     return true;     } }  ?>

the view update values

<?form _open(base_url()."index.php/newoffer/updateoffer")?> <div class="form">  // <?php echo form_open('newoffer/addoffer'); ?> <legend>please enter details new offer</legend> <label for="id number">id number:  <span class="required">*</span></label> <input type="text" name="idnum" id="idnum" placeholder="please enter id number/> <label for="phone number">phone number:</label> <input type="text" name="phnenum" id="phnenum " placeholder="please enter phone number"/>   <fieldset class="submit_field">      <?php echo form_submit('mysubmit', 'submit form'); ?>  </fieldset>  </div><!-- end of form div -->    ?>

you aren't passing data model here 

$this->offer_model->upddata();

you need add like

$this->offer_model->upddata($this->input->post());

also in model code $idnum undefined need provide too.

e.g:

public function upddata($data) {   $idnum = $data['idnum'];   unset($data['idnum']);   $this->db->where('idnum', $idnum);   $this->db->update('offers' ,$data);   return true; } //etc

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