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                # 5.3\. 多次映射同一個類 對特定的持久化類,映射多次是允許的。這種情形下,你必須指定_entity name_來區別不同映射實體的對象實例。(默認情況下,實體名字和類名是相同的。) Hibernate在操作持久化對象、編寫查詢條件,或者把關聯映射到指定實體時,允許你指定這個entity name(實體名字)。 ``` <class name="Contract" table="Contracts" entity-name="CurrentContract"> ... <set name="history" inverse="true" order-by="effectiveEndDate desc"> <key column="currentContractId"/> <one-to-many entity-name="HistoricalContract"/> </set> </class> <class name="Contract" table="ContractHistory" entity-name="HistoricalContract"> ... <many-to-one name="currentContract" column="currentContractId" entity-name="CurrentContract"/> </class> ``` 注意這里關聯是如何用`entity-name`來代替`class`的。
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