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# 第 7 章 关联关系映射 **目录** + 7.1\. 介绍 + 7.2\. 单向关联(Unidirectional associations) + 7.2.1\. 多对一(many to one) + 7.2.2\. 一对一(one to one) + 7.2.3\. 一对多(one to many) + 7.3\. 使用连接表的单向关联(Unidirectional associations with join tables) + 7.3.1\. 一对多(one to many) + 7.3.2\. 多对一(many to one) + 7.3.3\. 一对一(one to one) + 7.3.4\. 多对多(many to many) + 7.4\. 双向关联(Bidirectional associations) + 7.4.1\. 一对多(one to many) / 多对一(many to one) + 7.4.2\. 一对一(one to one) + 7.5\. 使用连接表的双向关联(Bidirectional associations with join tables) + 7.5.1\. 一对多(one to many) /多对一( many to one) + 7.5.2\. 一对一(one to one) + 7.5.3\. 多对多(many to many) + 7.6\. 更复杂的关联映射