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1 什么叫关联映射 通过数据库对象之间的关联关系(一对一.一对多.多对多),反映到实体对象上之间的引用. 举例 用户实体类(User):user_id user_name user_token 笔记本实体类(Book):book_id user_id book_name 一个笔记本对应一个用户(一对一).一个用户对应多个笔记本(一对多) 案例:根据用户ID去查询用户信息以及该用户所有的笔记信息时就需要用到关联查询,所以就需要用到关联映射 关联查询实体类:user_id user_name use

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