讨论数量: 35
![](https://cdn.learnku.com/uploads/avatars/28562_1533971919.png!/both/100x100)
老师,数据库设计使用外键和业务代码控制外键关联怎么取舍
![](https://cdn.learnku.com/uploads/avatars/30309_1545708136.jpeg!/both/100x100)
老师,问个题外问题.
![](https://cdn.learnku.com/uploads/avatars/10668_1516851432.jpg!/both/100x100)
SQLSTATE [HY000]: General error: 1215 Cannot add foreign key constraint
![](https://cdn.learnku.com/uploads/avatars/23547_1522236424.png!/both/100x100)
关于生成订单号的问题
![](https://cdn.learnku.com/uploads/avatars/28562_1533971919.png!/both/100x100)
老师,数据库字段设计是不是得尽量 not null?
![](https://cdn.learnku.com/uploads/avatars/20047_1519798224.jpg!/both/100x100)
商品类目数据库结构设计 具体例子
![](https://cdn.learnku.com/uploads/avatars/35814_1677946054.jpeg!/both/100x100)
软删除与外键
![](https://cdn.learnku.com/uploads/avatars/17214_1503021651.jpg!/both/100x100)
status 使用 varchar 的考虑?
![](https://cdn.learnku.com/uploads/avatars/30309_1545708136.jpeg!/both/100x100)
老师,我查手册 array_filter () 函数不是要传递一个回调函数来过滤么?
![](https://cdn.learnku.com/uploads/avatars/26937_1530612550.jpeg!/both/100x100)
sprintf () 的作用
![](https://cdn.learnku.com/uploads/avatars/42337_1560599890.jpg!/both/100x100)
数据库迁移报错!反复做了几遍还是一样。
![](https://cdn.learnku.com/uploads/avatars/29618_1578023759.jpeg!/both/100x100)
模型追加属性
![](https://cdn.learnku.com/uploads/avatars/10508_1485386793.png!/both/100x100)
leo 老师,考虑到类目的修改,是不是应该监听 saving 事件?
![](https://cdn.learnku.com/uploads/avatars/26469_1529485878.jpg!/both/100x100)
访问器疑问
![](https://cdn.learnku.com/uploads/avatars/26469_1529485878.jpg!/both/100x100)
parent 关联疑惑?
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想问下,使用 like 查询不是也会很慢么
![](https://cdn.learnku.com/uploads/avatars/38401_1566400326.jpg!/both/100x100)
关于 parent 方法 方法模型关联自己 这一步有些疑问
![](https://cdn.learnku.com/uploads/avatars/23547_1522236424.png!/both/100x100)
关于 nosql 在项目中的使用
![](https://cdn.learnku.com/uploads/images/201801/03/1/53yTn1mLOK.jpg)
请教一下老师,无限级分类和三级分销功能差不多吗?
![](https://cdn.learnku.com/uploads/avatars/31070_1590336402.jpg!/both/100x100)
商品可属于多种层级应该如何设计?
![](https://cdn.learnku.com/uploads/avatars/23547_1522236424.png!/both/100x100)
索引的疑问以及字段注释的建议
![](https://cdn.learnku.com/uploads/avatars/20500_1551950162.jpeg!/both/100x100)
crowdfunding_products 表无法添加外键约束
![](https://cdn.learnku.com/uploads/avatars/29618_1578023759.jpeg!/both/100x100)
关于 products、product_sku、categories 表的主键
![](https://cdn.learnku.com/uploads/avatars/32513_1649848924.jpg!/both/100x100)
这里字段 “当期逾期费 fine” 字段默认 null ,和用 默认为 0 的区别大吗
![](https://cdn.learnku.com/uploads/avatars/29618_1578023759.jpeg!/both/100x100)
is_directory(是否拥有子类目)这个字段是出于什么考虑
![](https://cdn.learnku.com/uploads/avatars/30309_1545708136.jpeg!/both/100x100)
老师,加不加 floatval () 函数好像没什么区别吧?我测试了对结果没有什么改变啊
![](https://cdn.learnku.com/uploads/avatars/30309_1545708136.jpeg!/both/100x100)
老师,商品分类表中这里是将外键和自增 ID 放置在同一张表中吧?
![](https://cdn.learnku.com/uploads/avatars/27439_1535532322.png!/both/100x100)
Endroid Installer did not detect a compatible project type for auto-configuration
![](https://cdn.learnku.com/uploads/avatars/24860_1525531942.jpg!/both/100x100)
getValue () 函数是在哪定义的呢?
![](https://cdn.learnku.com/uploads/avatars/30309_1545708136.jpeg!/both/100x100)
老师,分期付款中总本金指的啥?
![](https://cdn.learnku.com/uploads/avatars/30309_1545708136.jpeg!/both/100x100)
老师,命名空间的问题
![](https://cdn.learnku.com/uploads/avatars/26469_1529485878.jpg!/both/100x100)
为什么说 bcmath 函数用起来很不方便?
![](https://cdn.learnku.com/uploads/avatars/18154_1566432776.jpg!/both/100x100)
购物车性能优化是不是也得介绍介绍?
![](https://cdn.learnku.com/uploads/avatars/56665_1579158408.jpeg!/both/100x100)
计算进度的访问器中,为什么金额要加attributes?
![](https://cdn.learnku.com/uploads/avatars/27900_1574653321.jpg!/both/100x100)
如果想要实现无限级分类加自定义排序该怎么做