Define the equality relationship.
定义相等关系。
Define a relationship which indicates that the two newly created classes are implementers of the interface.
定义一个关系,指明那两个新建的类是这个接口的实现。
The sample database did not explicitly define the relationship, so you will add it to your entities.
例子中的数据库没有详细地定义这种关系,所以现在您需要向您的实体添加关系。
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