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                # 5.1.4.6\. 觸發器實現的主鍵生成器(Primary keys assigned by triggers) 僅僅用于遺留的schema中 (Hibernate不能使用觸發器生成DDL)。 ``` <id name="id" type="long" column="person_id"> <generator class="select"> <param name="key">socialSecurityNumber</param> </generator> </id> ``` 在上面的例子中,類定義了一個命名為`socialSecurityNumber`的唯一值屬性, 它是一個自然鍵(natural key),命名為`person_id`的代理鍵(surrogate key) 的值由觸發器生成。
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