创建帮助程序 - >在非对象上调用成员函数get（）

Question

I try to create my own helper but face a problem.

First i create a function called select. First if you see something wrong in this method pls tell me.

public function select($where = null, $order = null, $limit = null, $columns = '*') {
        if (!$columns)
            $this->db->select('*');
        elseif (is_array($columns)) {
            $columns = implode(',', $columns);
            $this->db->select($columns);
        }

        if ($where)
            $this->db->where($where);
        if ($order)
            $this->db->order_by($order);
        if ($limit)
            $this->db->limit($limit);

        $query  = $this->db->get('pasaj_register');

        return $query;
    }

and then i try to call this function like that

pasajItem  = new pasajItem();
         $a = $pasajItem->select();
         echo $a;

However i take this error:

Answer 1

Within a helper you cannot acces the database. First of all, it's not intended to do so. You'll probably want to make a library of this, where you give a reference to the database on creation.

Besides the design flaw i believe you are making here, you have to use:

$CI =& get_instance();
$CI->db->*****

to access the CodeIgniter Database from a helper or library. This is because they don't derive form a CodeIgniter standard class which contains the objects.