The Entity Framework also includes a powerful mapping engine that allows developers to map the EDM schema to a relational database for actual storage.
NET实体框架还提供了一个强大的映射机制，让开发者能够很容易 地将EDM架构和实际的关系型数据库映射起来。
For example, early attempts at storing XML data in varchar2 fields of a relational database resulted in poor query performance when an XQuery engine was simply layered on top.
比如，最初曾经尝试将XML数据保存在关系数据库的varchar2字段中，然后简单地增加一个XQuery引擎层，结果查询性能很差。
Ning is similar to the Google App Engine in that it provides a data-store API instead of a relational database.
与GoogleAppEngine相似，Ning提供一个数据存储api而不是关系数据库。
As I mentioned, Hibernate can't be used (mainly because with the App Engine you don't have a relational database).
如前所述，Hibernate就不受支持(主要是因为使用AppEngine时，您无法拥有关系数据库)。
Because we are using Hibernate as our provider, we cannot choose a non-relational database like Google App Engine.
因为我们使用Hibernate作为我们的提供者，我们不能选择非关系型数据库，比如GoogleApp Engine。
Because we are using Hibernate as our provider, we cannot choose a non-relational database like Google App Engine.
因为我们使用Hibernate作为我们的提供者，我们不能选择非关系型数据库，比如GoogleApp Engine。
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