How to upload file in database with ajax in codeigniter?

Upload file in the database with ajax in Codeigniter?

Paste in View

<form id="doc_table" name="doc_table" method="post" enctype="multipart/form-data"   >

<?php //echo validation_errors(); ?> 

<?php //echo form_open_multipart('upload/do_upload'); ?>

      <div class="modal-body">

        

  <div class="form-group">

<label for="formGroupExampleInput">Document Name</label>

<input type="text" class="form-control doc_name" id="formGroupExampleInput" name="doc_name"  placeholder="Example input">

<label for="exampleFormControlTextarea1">Comment</label>

<textarea class="form-control doc_comment" id="exampleFormControlTextarea1" name="doc_comment"  rows="3"></textarea>

<label for="exampleFormControlFile1">Upload File</label>

<input type="text" name="lead_id" value="<?php echo $leads[0]['id']; ?>">

<input type="file" class="form-control-file doc_file" name="doc_file"  id="exampleFormControlFile1">

  </div>

      </div>

      <div class="modal-footer">

        <button type="button" class="btn btn-secondary" data-dismiss="modal">Cancel</button>

        <input type="submit" value="Save" name="upload_documents" class="lead_upload_docs" class="btn btn-primary">

      </div>

  </form>

<script>

jQuery('#doc_table').submit(function(e){

e.preventDefault();

 

var doc_name = jQuery('.doc_name').val();

var doc_comment = jQuery('.doc_comment').val();

var doc_file = jQuery('.doc_file').val();

var leadid =  <?php echo $leads[0]['id']; ?>;

if(leadid){

jQuery.ajax({

url:'<?php echo base_url(); ?>leads/add_lead_docs',

type:"post",

data:new FormData(this),

processData:false,

contentType:false,

cache:false,

async:false,

success:function(response){  

console.log(response);

}

});

}else{

jQuery('#result_notice').html('');

}

  

});

</script>

Paste in Controller

  public function add_lead_docs(){

  

$lead_id = $this->input->post('lead_id');

$doc_name = $this->input->post('doc_name');

$doc_comment = $this->input->post('doc_comment');

$config['upload_path']          = 'assets/upload';

            $config['allowed_types']        = 'gif|jpg|png';

$config['encrypt_name'] = TRUE;

                $this->load->library('upload', $config);

                if ( ! $this->upload->do_upload('doc_file'))

                {

                        $error = array('error' => $this->upload->display_errors());

print_r($error);

echo 'FIle Error';

                }

                else

                {

                        $data = array('upload_data' => $this->upload->data());

echo 'FIle Uploaded Successfully';

echo $file_name = $this->upload->data('file_name');

                } 

$data = array(

                    'doc_name' => $doc_name,

                    'doc_comment' => $doc_comment,

                    'doc_path' => $file_name,

'p_id' => $lead_id,

                    'type' => 'doc'

); 

    $this->Leads_model ->add_documents($data); 

 

  

  }

Paste in Model

function add_documents($data)

    {

$insert = $this->db->insert('leads_history', $data);

$insert_id=$this->db->insert_id();

return $insert_id;

}