public function _initialize()
{
//获取购物车中的总商品数和总价格
$cart_model = new \Model\CartModel();
$total = $cart_model->getTotal();
$this->assign('total', $total);
//取出顶级栏目，用于导航显示
$cat_model = new \Model\CategoryModel();
$nav_list = $cat_model->getNav();
$this->assign('nav_list', $nav_list);
}
public function clearCart()
{
//判断购物车中有没有商品
$cart_model = new \Model\CartModel();
$total = $cart_model->getTotal();
if ($total['total_count'] > 0) {
$cart_model->clearCart();
$this->success('清空购物车成功', U('Index/index'), 1);
exit;
}
$this->error('您的购物车空了，赶紧购物吧！', U('Index/index'));
}
public function flow()
{
//获取购物车中的全部商品
$cart_model = new \Model\CartModel();
$cartlist = $cart_model->cartlist();
//下单之前要判断库存是否充足
//运用文件锁和事务，防止订单出错
$fp = fopen('./Public/order.lock', 'w');
//开始加锁
if (flock($fp, LOCK_EX)) {
foreach ($cartlist as $v) {
//取出库存，根据goods_id,goods_attr_id来取出（没有属性的商品则在goods表中取）
if (!empty($v['goods_attr_id'])) {
$where = "goods_id=" . $v['goods_id'] . " and goods_attr_id='" . $v['goods_attr_id'] . "'";
$kc = M('Product')->where($where)->find();
//返回一个一维数组
} else {
$kc = M('Goods')->where("goods_id=" . $v['goods_id'])->find();
}
if ($kc['goods_number'] < $v['goods_count']) {
$this->error('库存不足，无法下订单');
}
}
//在checkout.html中表单增加隐藏域，用来获取收货人的信息，也可以用连表
//查询的形式，在订单信息表中就不用收货人信息的几个字段，改成收货人表的
//id字段做关联
$data['user_id'] = $_SESSION['user_id'];
//用户登陆的id
$data['order_sn'] = 'sn_' . uniqid();
//订单号
$cart_model = new \Model\CartModel();
$total = $cart_model->getTotal();
$data['goods_amount'] = $total['total_price'];
//总金额
$data['consignee'] = I('post.consignee');
//收货人名
$data['address'] = I('post.address');
//收货人地址
$data['mobile'] = I('post.mobile');
//收货人手机
$data['payment'] = I('post.payment');
//支付方式
$data['shipping'] = I('post.shipping');
//配送方式
$data['addtime'] = time();
//下单时间
//开启事务
mysql_query("start transaction");
$order_id = M('OrderInfo')->add($data);
//添加订单信息，成功返回自增的订单编号
if (!$order_id) {
//失败就回滚，并释放文件锁
mysql_query("rollback");
flock($fp, LOCK_UN);
// 释放锁定
}
//将购物车中的商品全部遍历添加到订单商品关系表中
foreach ($cartlist as $v) {
$res_id = M('OrderGoods')->add(array('order_id' => $order_id, 'goods_id' => $v['goods_id'], 'goods_name' => $v['info']['goods_name'], 'goods_attr_id' => $v['goods_attr_id'], 'shop_price' => $v['info']['shop_price'], 'goods_count' => $v['goods_count']));
if (!$res_id) {
//失败就回滚，并释放文件锁
mysql_query("rollback");
flock($fp, LOCK_UN);
// 释放锁定
}
}
//下单成功，有一个减少库存的操作
//判断订单商品有没有goods_attr_id，有则在product表中修改，没有则在goods表中修改
foreach ($cartlist as $v) {
//取出库存，根据goods_id,goods_attr_id来取出（没有属性的商品则在goods表中取）
if (!empty($v['goods_attr_id'])) {
$where = "goods_id=" . $v['goods_id'] . " and goods_attr_id='" . $v['goods_attr_id'] . "'";
$rs = M('Product')->where($where)->setDec('goods_number', $v['goods_count']);
//还要更改商品表中的库存量
M('Goods')->where("goods_id=" . $v['goods_id'])->setDec('goods_number', $v['goods_count']);
if (!$rs) {
//失败就回滚，并释放文件锁
mysql_query("rollback");
flock($fp, LOCK_UN);
// 释放锁定
}
} else {
$rs = M('Goods')->where("goods_id=" . $v['goods_id'])->setDec('goods_number', $v['goods_count']);
if (!$rs) {
//失败就回滚，并释放文件锁
mysql_query("rollback");
flock($fp, LOCK_UN);
// 释放锁定
}
}
}
//都成功，提交事务
mysql_query("commit");
flock($fp, LOCK_UN);
// 释放锁定
} else {
$this->error('系统忙，请稍后下单');
}
//订单成功，要清空购物车，跳转到显示订单完成的页面
$cart_model->clearCart();
$this->redirect("Order/done", array('order_sn' => $data['order_sn']));
}
