我更新了一些数据，它返回失败时，它成功地更新或没有。
这是我的控制器代码：

$data['edit_cli'] = $this->clients_model->edit_cli();
if(!empty($data['edit_cli'])){
  $_SESSION['cli_updated'] = '<div class="alert alert-success cli_updated">
  <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
  Client Updated Successfully
  </div>';
  $this->session->mark_as_flash('cli_updated');
}
else{
  $_SESSION['cli_updated'] = '<div class="alert alert-danger cli_updated">
  <a href="#" class="close" data-dismiss="alert" aria-label="close">&times;</a>
  Client Updated Failed
  </div>';
  $this->session->mark_as_flash('cli_updated');
}

我想要的是：如果数据更新成功，它只返回 Client Updated Successfully 如果无法成功更新，则返回 Client Updated Failed .
我的控制器代码，可能是我的 if 条件？
这是我的 model 代码：

function edit_cli(){
            date_default_timezone_set('Asia/Dhaka');
            $date = date('Y-m-d',time());

            $cli_id = $this->input->post('client_id');
            $data = array(
                'product_id' => $this->input->post('product_id'),
                'clientName' => $this->input->post('clientName'),
                'companyName' => $this->input->post('companyName'),
                'client_info_doc' => $date,
                'client_info_created_by' => $this->session->userdata('user_id')
                );

            $this->db->where('client_id', $cli_id);
            $this->db->update('tbl_client_info', $data);    

        }