The Rails migration feature helps application developers manage this schema evolution, making it easy to synchronize changes between the application code and the database objects.
Rails迁移特性可以帮助应用程序开发人员管理这种模式演变，便于在应用程序代码与数据库对象之间同步更改。
If you decide to have a more feature-rich database later, you will have to change the code in your application.
如果您决定以后拥有一个功能更丰富的数据库，您必须更改应用程序中的代码。
The overall architecture of the system consisted of code interpreter, modeling module, feature database of turning based on STEP-NC and simulation drive is established.
讨论了仿真系统的译码器、基于特征的加工数据库、实体建模以及仿真驱动等组成模块实现的关键技术和方法。
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