问那么，如果第二个块在Codeigniter中有嵌套的db查询，如何在视图上打印条件特定的结果？

EN

P_m extends CI_Model
{
    public $return = [];

    public function __construct()
    {
        parent::__construct();
        $this->load->database();//or load it in APPPATH . 'config/autoload.php'
    }

    public function p()
    {
        $q = $this->db->query("select * from painting_data");
        $return['error'] = $q->num_rows() > 0 ? FALSE : TRUE;

        $q->free_result();

        if ($return['error'] === FALSE)
        {
            $q = $this->db->query("Select * from painting_data order by padd desc limit 6");
            $this->return = $q->result();
        }

        return $return;
    }
}

P_c extends CI_Controller
{
    public function __construct()
    {
        parent::__construct();
        $this->load->model('p_m');//if used more often, load it in APPPATH . 'config/config.php'
    }

    public function index()
    {
        $output_data['data_from_p_m'] = $this->p_m->p();
        $this->load->view('p_v', $output_data);
    }
}

if ( $data_from_p_m['error'] === FALSE ) 
{
    var_dump($data_from_p_m);
}
else
{
    echo "<div class='well'>No painting available.</div>";
}

Controller :

class Mypage extends CI_Controller {

public function index (  )
{
    $this->load->model ( 'Mypage _model' );

    $data['dbdata'] = $this->mypage_model->get ();

    /** Check Errors */
    if ( $data['dbdata'] === FALSE ) { //show 404 or something else }

    $data[ 'title' ] = 'my Page';

    $this->load->view ( 'mypage', $data);
}

}


Model :

class Login_model extends CI_Model {

public function __construct()
{
    $this->error ['error'] = TRUE;
}

public function get (  )
{
    $data = array ();

    /** Get your database records here.*/
    if ( $some_error_condition ) return FALSE;

    if ( $no_records_found ) return $this->error;

    return $data;
}

}

View :

if ( isSet( $error ) ) // no records found.
{
   //do something
}
else {
   foreach ( $dbdata as $key => $value )
   {
       //do something
   }
}