89 lines
2.6 KiB
Java
89 lines
2.6 KiB
Java
package com.qf.service.impl;
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import com.qf.dao.CartDao;
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import com.qf.dao.ProductDao;
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import com.qf.dao.impl.CartDaoImpl;
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import com.qf.dao.impl.ProductDaoImpl;
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import com.qf.entity.Cart;
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import com.qf.entity.Product;
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import com.qf.service.CartService;
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import java.lang.reflect.InvocationTargetException;
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import java.math.BigDecimal;
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import java.sql.SQLException;
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import java.util.List;
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public class CartServiceImpl implements CartService {
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//1.向购物车中添加物品
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@Override
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public void createCart(int uid, String pid) throws SQLException, InvocationTargetException, IllegalAccessException {
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//1.判断商品是否已经存在
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CartDao cartDao = new CartDaoImpl();
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Cart cart = cartDao.hasCart(uid, pid);
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if (cart != null) {
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//已存在该物品，修改数量
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cart.setCnum(cart.getCnum() + 1);
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cartDao.updateCart(cart);
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} else {
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//不存在该物品，添加该物品
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ProductDao productDao = new ProductDaoImpl();
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Product product = productDao.selectProductByPid(pid);
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//完成添加
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cart = new Cart();
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cart.setCnum(1);
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cart.setPid(Integer.parseInt(pid));
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cart.setProduct(product);
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cart.setUid(uid);
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//完成插入操作
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cartDao.insertCart(cart);
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}
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}
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//2.根据uid查询所有商品
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@Override
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public List<Cart> findAll(int uid) throws SQLException, InvocationTargetException, IllegalAccessException {
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CartDao cartDao = new CartDaoImpl();
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//1.根据用户 id 查询对应购物车里面的商品
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List<Cart> carts = cartDao.selectCartByUid(uid);
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return carts;
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}
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//3.根据cid删除购物车中物品
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@Override
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public void deleteCartByCid(String cid) throws SQLException {
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CartDao cartDao = new CartDaoImpl();
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cartDao.deleteCartByCid(cid);
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}
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//4.购物车修改数量
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@Override
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public void updateCartByCid(String cid, String price, String cnum) throws SQLException {
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//1.将对应的 cnum 和 price 转换成对应的大数据类型
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BigDecimal cnumbig = new BigDecimal(cnum);
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BigDecimal prciebig = new BigDecimal(price);
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//2.进行小计计算
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BigDecimal count = prciebig.multiply(cnumbig);
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//3.数据库中修改
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CartDao cartDao = new CartDaoImpl();
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cartDao.updateByCid(count, cnumbig, cid);
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}
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//5.清空购物车
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@Override
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public void clearCartByUid(String uid) throws SQLException {
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CartDao cartDao = new CartDaoImpl();
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cartDao.clearCartByUid(uid);
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}
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}
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