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$customer = Customer::findOne(1); $orders = $customer->orders; // 通過在Customer中定義的關(guān)聯(lián)方法（getOrders()）來獲取這個客戶的所有的訂單。
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// 執(zhí)行sql語句: SELECT * FROM customer WHERE id=1 $customer = Customer::findOne(1); //執(zhí)行sql：SELECT * FROM order WHERE customer_id=1 $orders1 = $customer->orders; //這個不會執(zhí)行sql，直接使用上面的緩存結(jié)果 $orders2 = $customer->orders; //如果中間的用戶訂單有變化，我們就不能從緩存中獲取，要unset掉 unset($customer->orders); $orders2 = $customer->orders;
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