如果OR M框架为引用限制的建模提供了便利的话，这些内容会在你的数据库和应用程序代码上重复定义。

If your ORM framework offers facilities for modeling referential constraints, these are again defined both on your DB and in your application code.

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一个价格表上的价格可以依赖于另一个价格表，这意味这你不用为每一个产品重复定义所有的情况。

The prices on a pricelist can depend on another list, which means that you do not have to repeat the definition of all conditions for each product.

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与其重复定义和管理这些属性的代码，不如创建一个通用的帐户(account)类，该类具有现金收支平衡并且可以处理借贷事务。

Rather than duplicate the code that defines and manages these properties, you can create a common Account parent class that has a cash balance, and can handle credit and debit transactions.

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