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                # 7.2.3\. 一對多(one to many) _基于外鍵關聯的單向一對多關聯_是一種很少見的情況,并不推薦使用。 ``` <class name="Person"> <id name="id" column="personId"> <generator class="native"/> </id> <set name="addresses"> <key column="personId" not-null="true"/> <one-to-many class="Address"/> </set> </class> <class name="Address"> <id name="id" column="addressId"> <generator class="native"/> </id> </class> ``` ``` create table Person ( personId bigint not null primary key ) create table Address ( addressId bigint not null primary key, personId bigint not null ) ``` 我們認為對于這種關聯關系最好使用連接表。
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