https://blog.youkuaiyun.com/Yu_iChanzh-cnhttps://blog.youkuaiyun.com/https://blog.youkuaiyun.com/Yu_iChan/article/details/157128788https://blog.youkuaiyun.com/Yu_iChan/article/details/157128788Yu_iChanMon, 19 Jan 2026 10:16:21 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/156768708https://blog.youkuaiyun.com/Yu_iChan/article/details/156768708Yu_iChanWed, 14 Jan 2026 10:16:26 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/156723139https://blog.youkuaiyun.com/Yu_iChan/article/details/156723139Yu_iChanThu, 08 Jan 2026 14:50:47 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/156677277https://blog.youkuaiyun.com/Yu_iChan/article/details/156677277Yu_iChanWed, 07 Jan 2026 10:46:34 +0800 其实根据id和userId找到的肯定只有一个ShoppingCart 其实没多大意义？分情况讨论，如果商品的number是>1的我们只需要修改number即可，反之我们直接删除这条购物车数据。]]>https://blog.youkuaiyun.com/Yu_iChan/article/details/156649348https://blog.youkuaiyun.com/Yu_iChan/article/details/156649348Yu_iChanTue, 06 Jan 2026 21:04:46 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/156595213https://blog.youkuaiyun.com/Yu_iChan/article/details/156595213Yu_iChanMon, 05 Jan 2026 11:13:37 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/156535489https://blog.youkuaiyun.com/Yu_iChan/article/details/156535489Yu_iChanSat, 03 Jan 2026 12:35:59 +0800，同样存入VO中返回给前端！(3) 在2删除完之后我们需要重新插入关联的菜品，这里需要注意的是可能前端没给我们它具体关联的套餐id，所以需要手动赋值，最后调用前面新增套餐时候封装好的insertBatch接口插入表就好了。要把套餐起售首先需要判断套餐里面的菜品是否是起售状态，如果不是则不可以起售套餐。]]>https://blog.youkuaiyun.com/Yu_iChan/article/details/156446170https://blog.youkuaiyun.com/Yu_iChan/article/details/156446170Yu_iChanWed, 31 Dec 2025 14:17:47 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/156429430https://blog.youkuaiyun.com/Yu_iChan/article/details/156429430Yu_iChanTue, 30 Dec 2025 20:21:51 +0800也就是这个字段是一对多的，后面的ofType表示就是List存储的对象。(1)新增菜品的时候我们会选择一个category，如果没有即使更新缓存，客户访问的时候由于不走数据库所以会无法查询到新增加的菜品，所以在新增菜品这个操作后我们需要清楚对应category的缓存。首先定义一个 id 后续select中要用到，表明它查出来的需要找到这个Map对应封装。]]>https://blog.youkuaiyun.com/Yu_iChan/article/details/156414397https://blog.youkuaiyun.com/Yu_iChan/article/details/156414397Yu_iChanTue, 30 Dec 2025 10:53:48 +0800，至于为什么是这样就像上面说的前端会根据返回值将id隐藏到选项中，一旦选择了某个菜品分类，就会自动赋值categoryid，像新增菜品中是如何得到categoryid就是这样得到的。从上述图中可以得到，用的PUT方法，并且是用过json传递参数，包括id，name，sort，type四个参数，通常从前端接收用的是DTO，别忘记了@RequestBody。前端传过来的是分类的ID即主键！]]>https://blog.youkuaiyun.com/Yu_iChan/article/details/156309328https://blog.youkuaiyun.com/Yu_iChan/article/details/156309328Yu_iChanSat, 27 Dec 2025 00:10:01 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146438399https://blog.youkuaiyun.com/Yu_iChan/article/details/146438399Yu_iChanSat, 22 Mar 2025 13:16:58 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146438372https://blog.youkuaiyun.com/Yu_iChan/article/details/146438372Yu_iChanSat, 22 Mar 2025 13:13:25 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146438261https://blog.youkuaiyun.com/Yu_iChan/article/details/146438261Yu_iChanSat, 22 Mar 2025 13:10:32 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146300235https://blog.youkuaiyun.com/Yu_iChan/article/details/146300235Yu_iChanSun, 16 Mar 2025 19:52:28 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146278182https://blog.youkuaiyun.com/Yu_iChan/article/details/146278182Yu_iChanSat, 15 Mar 2025 13:31:05 +0800=x的第一个数，所以采用lower_bound()]]>https://blog.youkuaiyun.com/Yu_iChan/article/details/146278107https://blog.youkuaiyun.com/Yu_iChan/article/details/146278107Yu_iChanSat, 15 Mar 2025 13:24:33 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146277883https://blog.youkuaiyun.com/Yu_iChan/article/details/146277883Yu_iChanSat, 15 Mar 2025 13:02:04 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146277851https://blog.youkuaiyun.com/Yu_iChan/article/details/146277851Yu_iChanSat, 15 Mar 2025 12:59:35 +0800https://blog.youkuaiyun.com/Yu_iChan/article/details/146277820https://blog.youkuaiyun.com/Yu_iChan/article/details/146277820Yu_iChanSat, 15 Mar 2025 12:56:21 +0800