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如何在codeigniter中获取数据库列的总和？

朋友，我无法获得未平仓职位。这是我的代码。我得到的是1（一个）而不是总和。帮我解决这个问题。

控制器：

function index(){
    $userId = $this->phpsession->get("userId");
    $userType = $this->phpsession->get('userType');
    $date = date("Y-m-d");
    if(!$userId && !$this->phpsession->get("userType")){
        redirect(base_url().'user');
    }

    $config['base_url'] = base_url().'requirement/index';
    $config['total_rows'] = $this->requirement_model->GetRequirement(array("count"=>true));
    $config['per_page'] = 5;
    $config['cur_tag_open'] = '<a>';
    $config['cur_tag_close'] = '</a>';

    $this->pagination->initialize($config);

    $options['offset'] = $this->uri->segment(3);
    $options['limit'] = $config['per_page'];        
    $options['join']=true;

    $data['clients'] = $this->client_model->ajaxclient();
    $data['requirements'] = array(""=>"Choose requirement");

    $data['requirement'] = $this->requirement_model->GetRequirement($options);
    $data['links'] = $this->pagination->create_links();
    $data['totalactive']=$this->requirement_model->GetRequirement(array("find"=>true));
    $data['totalrequirement']=$this->requirement_model->GetRequirement(array("totalreq"=>true));
    $data['openpositions']=$this->requirement_model->GetRequirement(array("openpos"=>true));
    //print_R($data['openpositions']);exit;
    //echo "<pre>"; print_R($this->db->last_query()); exit;

    $data['page_title'] = "Requirement Details";
    $this->layout->view("requirement/index",$data); 

}

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这是我的模型功能