public void updateItemNum(Long itemId, Integer num) {
Example example = new Example(Cart.class);
example.createCriteria().andEqualTo("userId", UserThreadLocal.get().getId());
Cart cart = new Cart();
cart.setItemId(itemId);
cart.setNum(num);
cartDao.updateByExample(cart, example);
}
public void deleteItemFromCart(Long itemId) {
Cart cart = new Cart();
cart.setItemId(itemId);
cart.setUserId(UserThreadLocal.get().getId());
cartDao.delete(cart);
}
public void addItemToCart(Long itemId) {
// 判断该商品是否存在购物车中
// 如果存在，数量相加
// 如果不存在，直接保存到数据库
Cart record = new Cart();
record.setItemId(itemId);
record.setUserId(UserThreadLocal.get().getId());
Cart cart = this.cartDao.selectOne(record);
if (null == cart) {
Item item = this.itemService.queryItemById(itemId);
cart = new Cart();
cart.setId(null);
cart.setItemId(itemId);
cart.setNum(1); // TODO 默认为1
cart.setCreated(new Date());
cart.setUpdated(cart.getCreated());
cart.setUserId(record.getUserId());
// 设置商品的基本数据
cart.setItemTitle(item.getTitle());
cart.setItemPrice(item.getPrice());
String itemImage = item.getImage();
if (StringUtils.isNotEmpty(itemImage)) {
cart.setItemImage(StringUtils.split(itemImage, ",")[0]);
}
this.cartDao.insert(cart);
} else {
cart.setNum(cart.getNum() + 1); // TODO 先默认为1，项目实战中实现指定的购买数量
cart.setUpdated(new Date());
this.cartDao.updateByPrimaryKey(cart);
}
}