ORM复习
ORM复习
泛化 A is B 子与父
关联
一对一 A has One B B has One A 一夫一妻
一对多 A has many B B has One A 一夫多妻
多对一 A has One B B has many A 一妻多夫
多对多 A has many B B has many A

ORM复习

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