如何免費爲大宗訂單提供運輸服務？

Question

以下是在結帳時獲得運輸費用的功能。它基於幾件事/返回函數返回運輸成本;如果車的值是> =£100（「p.price」），那麼我需要返回的「0.00£」的值否則使用功能正常，即$query->row('total')我想：/

function get_cart_total($cartID) { 
     $this->db->select('SUM((COALESCE(NULLIF(sc.override_price_from_auction, 0), p.price))*sc.quantity) AS total',FALSE); 
     $this->db->join('products AS p', 'sc.product_id = p.product_id'); 
     $this->db->where('sc.cart_id',$cartID); 
     $query = $this->db->get('shopping_cart AS sc'); 
     return $query->row('total'); 


    function total_with_VAT($cartID, $taxAmount) { 
     $total = $this->get_cart_total($cartID); 
     $tax_inclusive_total = $total; 
     return $tax_inclusive_total; 
    } 

    function carriage_cost($cartID) { 
     $this->db->select('SUM(p.carriage*sc.quantity) AS total',FALSE); 
     $this->db->join('products AS p', 'sc.product_id = p.product_id'); 
     $this->db->where('sc.cart_id',$cartID); 
     $query = $this->db->get('shopping_cart AS sc'); 
     $query->row('total'); 
     //echo $this->db->last_query(); 
     return $query->row('total'); 
    } 

Answer 1

如果我正確理解你，你可以簡單地檢查total的值。

function carriage_cost($cartID) { 
    $this->db->select('SUM(p.carriage*sc.quantity) AS total',FALSE); 
    $this->db->join('products AS p', 'sc.product_id = p.product_id'); 
    $this->db->where('sc.cart_id',$cartID); 
    $query = $this->db->get('shopping_cart AS sc'); 

    $total = $query->row()->total; 
    return $total >= 100 ? 0 : $total; 
}