Template Method模式建议，应当将公共模板代码移到继承层次结构之上，将算法细节推迟到子类。
The Template Method pattern suggests that I should move common boilerplate code up the inheritance hierarchy, deferring algorithmic details to child classes.
无论如何，这两种类之间存在大量相同的行为，它们继承了公共基类 AbstractList。
Regardless, it turns out that a phenomenal amount of behavior between these two classes is identical, and as a result, both in turn inherit from a common base class, AbstractList.
所有派生实体类和会话类都继承了bobase类中create和find方法的公共代码。
All derived entity classes and the session class inherit the common code of the create and find methods from the BOBase class.
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