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。
You do not need to write any code to determine who the current user is or explicitly store the value in a database-the profile feature performs these tasks for you.
您不需要撰写任何程序码判断目前的使用者是谁，或是将值明确储存在资料库中，因为设定档功能会为您执行这些工作。
You do not need to write any code to determine who the current user is or explicitly store the value in a database-the profile feature performs these tasks for you.
您不需要撰写任何程序码判断目前的使用者是谁，或是将值明确储存在资料库中，因为设定档功能会为您执行这些工作。
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