Identifiers may use surrogate keys.
标识符可能使用代理键。
什么是代理键？
Many large applications use the key manager method to maintain the surrogate keys for all tables.
很多大型的应用程序使用键管理器方法维护所有表的代理键。
Third, write the KeyManger class to maintain the surrogate keys for each registered table. The KeyManager class will provide two methods.
第三，编写KeyManger类来维护每个已注册表的代理键。
Third, write the KeyManger class to maintain the surrogate keys for each registered table. The KeyManager class will provide two methods.
第三，编写KeyManger类来维护每个已注册表的代理键。
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