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我想映射兩個類之間具有一對一關係的關係。在互聯網上查看後,似乎人們更喜歡使用多對一來映射它。休眠映射xml一對一(多對一)
例如有一個班級訂單和一個班級比爾。比爾持有發票的FK。
這裏是我的比爾映射:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 21, 2016 10:46:20 PM by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
<class name="domain.Bill" table="BILL">
<id name="id" type="int">
<column name="ID" />
<generator class="native" />
</id>
<many-to-one name="order" class="domain.Order" column="ORDER_ID" unique="true" not-null="true"/>
</class>
</hibernate-mapping>
正如你可以在上面看到,在我的條例草案的映射我可以指定FK的列訂單,但我應該把我的映射訂單既然它沒有比爾的Fk?
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- Generated Mar 21, 2016 10:46:20 PM by Hibernate Tools 3.5.0.Final -->
<hibernate-mapping>
<class name="domain.Order" table="ORDER">
<id name="id" type="int">
<column name="ID" />
<generator class="native" />
</id>
<many-to-one name="bill" class="domain.Bill" ???? fetch="select"/>
</class>
</hibernate-mapping>
好的謝謝,生病了試試看 – William