RMS 类调用特定于平台的本机代码，这种本机代码使用标准 OS 数据管理器函数来执行实际的数据库操作。
The RMS classes call into the platform-specific native code that uses the standard OS data manager functions to perform the actual database operations.
他们也可以执行影响分析，从而找到所有会受到修改类或者数据库操作影响的用例。
They can also perform impact analysis to find out all the use cases that are impacted because of a change to a class or database table.
好了，我们只需要在程序中添加几行代码，和为每一个映射文件创建持久化类，而且NHibernate可以照顾到所有的数据库操作。
So, one need only add a few lines of code to an application and create a simple mapping file for each persistent class, and NHibernate takes care of all database operations.
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