Controller

<?php
defined('BASEPATH') OR exit('No direct script access allowed');

class Welcome extends CI_Controller {

    public function index(){
        $this->load->model('model');
        $posts = $this->model->getDb();
        $this->load->view('code',['post'=>$posts]);
    }
    public function tambah(){
        $this->load->view('tambah');
    }
    public function add(){
        $data = array(
                    'Nama'=>$this->input->post('Nama'),
                    'Alamat'=>$this->input->post('Alamat'),
                    'Email'=>$this->input->post('Email'),
                    'Jurusan'=>$this->input->post('Jurusan')
                    );
        $insert = $this->db->insert('code_tb',$data);
        if ($insert > 0) {
            redirect('welcome');
        }
    }
}