千峰商城-springboot项目搭建-78-购物车结算-查询购物车记录接口

一、购物车记录列表接口：

根据一个ID的集合，查询购物车记录，实现方式有两种：

1.动态SQL

<select id="searchShoppingCartById" resultMap="ShopCartMap">
    SELECT * FROM shopping_cart WHERE cart_id IN 
    <foreach collection="list" item="cid" separator="," open="(" close=")">
        #{cid}
    </foreach>
elect>

 2.tkMapper条件查询

critera.andIn("cartId",ids);

Service接口：

    @Override
    public ResultVO listShoppingCartsByCids(List cids) {
        Example example = new Example(ShoppingCart.class);
        Example.Criteria criteria = example.createCriteria();
        criteria.andIn("cartId",cids);
 
        List shoppingCarts = shoppingCartMapper.selectByExample(example);
        return null;
    }

这样查询出来的购物车中没有商品图片、商品名称，单价等信息，不满足需求。

二、数据库实现

1.ShoppingCartMapper：

    public List<ShoppingCartVO> selectShopcartByCids(List<Integer> cids);

2.映射配置(动态sql)：

 <select id="selectShopcartByCids" resultMap="ShoppingCartVOMap">
        SELECT c.cart_id,
        c.product_id,
        c.sku_id,
        c.user_id,
        c.cart_num,
        c.cart_time,
        c.product_price,
        c.sku_props,
        p.product_name,
        i.url,
        s.original_price,
        s.sell_price,
        s.sku_name
        FROM shopping_cart c
        INNER JOIN product p
        INNER JOIN product_img i
        INNER JOIN product_sku s
        ON c.product_id=p.product_id
        AND i.item_id=p.product_id
        AND c.sku_id=s.sku_id
        WHERE i.is_main=1 and c.cart_id IN
        <foreach collection="cids" item="cid" separator="," open="(" close=")">
            #{cid}
        </foreach>
    elect>

 3.单元测试

    @Test
    public void testShopCart(){
        //List categoryVOS = categoryMapper.selectFirstLevelCategories();
        List cids = new ArrayList<>();
        cids.add(1);
        cids.add(9);
        cids.add(15);
        List list = shoppingCartMapper.selectShopcartByCids(cids);
        System.out.println(list);
 
    }

 三、接口实现

ShoppingCartMapper：

 public List selectShopcartByCids(String cids);

 listShoppingCartsByCids：

    @Override    public ResultVO listShoppingCartsByCids(String cids) { //使用tkMapper查询出来的购物车中没有商品图片、商品名称，单价等信息，不满足需求。// Example example = new Example(ShoppingCart.class);// Example.Criteria criteria = example.createCriteria();// criteria.andIn("cartId",cids);//// List shoppingCarts = shoppingCartMapper.selectByExample(example); String[] arr = cids.split(","); List cartIds = new ArrayList<>(); for (int i = 0; i){ cartIds.add(Integer.parseInt(arr[i])); } List list = shoppingCartMapper.selectShopcartByCids(cartIds); ResultVO resultVO = new ResultVO(ResStatus.OK, "success", list); return resultVO; }

 四、控制层实现：

ShopcartController：

    @GetMapping("/listbycids")
    @ApiImplicitParam(dataType = "String",name = "cids",value = "选择的购物车记录的id",required = true)
    public ResultVO listByCids(String cids, @RequestHeader("token")String token){
        ResultVO resultVO = shoppingCartService.listShoppingCartsByCids(cids);
        return resultVO;
    }

 测试：