当数据库方案变更时，我不必创建特殊的代码来更新我的应用程序代码。
I did not have to create special code to update my application code when the database schema changed.
在编辑方案之后，我们需要应用方案变更，来更新每一个与方案相关的用户数据库。
After modifying the schema, we need upgrade each user databases associated with the schema by applying the schema changes. The steps are.
因此运用价值工程原理和模糊数学原理建立了设计变更方案和施工方案变更方案的技术经济评价模型。
Using value engineering theory and fuzzy mathematics theory, the paper establishes design change scheme and construction methods change scheme evaluation model.
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