关于我的结果,我想像下面那样
和我的数据库图:
Table category {
category_id integer [primary key]
category_title varchar
category_icon varchar
}
Table style {
style_id integer [primary key]
sytle_title varchar
style_icon varchar
}
Table season {
season_id integer [primary key]
season_title varchar
season_icon varchar
}
Table attributes {
attribute_id integer [primary key]
attribute_title varchar
attribute_icon varchar
}
Table item {
item_id integer [primary key]
item_title varchar
item_icon varchar
style_id integer
season_id integer
category_id integer
}
Table item_attribute {
item_id integer
attribute_id integer
value bool
}
Ref: style.style_id < item.style_id // many-to-one
Ref: category.category_id < item.category_id
Ref: season.season_id < item.season_id
Ref: item.item_id < item_attribute.item_id
Ref: attributes.attribute_id < item_attribute.attribute_id
我想用一些属性来存储我的项目。我试过实现 EAV 数据库模型我怎么不能正确地为空属性