php - codeigniter insert to mysql with external variable -

i sending form in $post, means jquery post, file called: register.php

now variable called "name" ... in register.php code:

<?php include "external.php"; $ci->load->database(); $fullname=$_request['name']; $data = array(             'full_name' => $fullname         ); $ci->db->insert('tbl_users', 'full_name'=>''); if( $_request["name"] ) {     $name = $_request['name'];    echo "welcome ". $name; }  ?> 

the external.php load codeigniter.

request name want insert db...

the code inserting db [full_name table] empty name.. , got problem:

a php error encountered

severity: warning

message: mysql_real_escape_string() expects parameter 2 resource, boolean given

filename: mysql/mysql_driver.php

line number: 314

how can insert $_request["name"] database ?

in view

 <?php echo form_open_multipart(base_url().'moderator/b2bcategory/insertname'); ?>                     <div class="box-body">                         <div class="row">                             <div class="col-xs-6">                                 <div class="form-group">                                     <label for="txtcatname">title of category :</label>                                     <input type="text" name="txtname" class="form-control" id="txtname" placeholder="category name " required="required">                                 </div>                             </div> 

in controller

 public function insertname() {         $this->load->helper(array('form', 'url'));         $this->load->view('moderator/templates/header');         $this->load->view('moderator/templates/sidebar');          if ($this->input->post('selsub')) {  $data = array('db_name' => $this->input->post('name'));  $this->b2bcategory_model->form_insert($data);             } } 

in model

public function form_insert($data){ $this->db->insert('jil_category', $data); } 

i sure wil you