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                # 第 21 章 示例:父子關系(Parent Child Relationships) **目錄** + 21.1\. 關于collections需要注意的一點 + 21.2\. 雙向的一對多關系(Bidirectional one-to-many) + 21.3\. 級聯生命周期(Cascading lifecycle) + 21.4\. 級聯與`未保存值`(Cascades and `unsaved-value`) + 21.5\. 結論 剛剛接觸Hibernate的人大多是從父子關系(parent / child type relationship)的建模入手的。父子關系的建模有兩種方法。由于種種原因,最方便的方法是把`Parent`和`Child`都建模成實體類,并創建一個從`Parent`指向`Child`的&lt;one-to-many&gt;關聯,對新手來說尤其如此。還有一種方法,就是將`Child`聲明為一個`&lt;composite-element&gt;`(組合元素)。 事實上在Hibernate中one to many關聯的默認語義遠沒有composite element貼近parent / child關系的通常語義。下面我們會闡述如何使用_帶有級聯的雙向一對多關聯(bidirectional one to many association with cascades)_去建立有效、優美的parent / child關系。這一點也不難!
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