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8.5.2. 一対一(One to one)
結合テーブルの双方向一対一関連 は非常に特殊ですが、可能です。
<class name="Person"> <id name="id" column="personId"> <generator class="native"/> </id> <join table="PersonAddress" optional="true"> <key column="personId" unique="true"/> <many-to-one name="address" column="addressId" not-null="true" unique="true"/> </join> </class> <class name="Address"> <id name="id" column="addressId"> <generator class="native"/> </id> <join table="PersonAddress" optional="true" inverse="true"> <key column="addressId" unique="true"/> <many-to-one name="person" column="personId" not-null="true" unique="true"/> </join> </class>
create table Person ( personId bigint not null primary key ) create table PersonAddress ( personId bigint not null primary key, addressId bigint not null unique ) create table Address ( addressId bigint not null primary key )