冗长乏味的JDBC开发导致对象关系映射(ORM)框架的诞生，该框架提供一个数据访问抽象层。
The tedium of JDBC development led to the creation of the object relational mapping (ORM) framework, which provides a data access abstraction layer.
在这样的设计中，更新被应用到了对象上，映射层的职责就是将这种变化反映到关系数据库中。
In such a design, updates are applied to objects and it is the responsibility of the mapping layer to migrate those changes to a relational database.
Session对象为程序员提供了一个临时的存储层，它非常像传统的对象关系映射工具中可以看到的层，而且还可以将它看作到特定工作区的连接。
The Session object provides the programmer with a transient storage layer, much like those found in traditional object-relational mapping tools, and also serves as a link to a particular workspace.
“自下而上”方法假设已经有数据库表模式，而需要根据表模式开发一个对象层和对象关系映射。
The “bottom up" approach assumes you already have database table schema and need to develop an object layer and object relational mapping from the table schema.
ActiveRecord并非全对象关系型映射层。
ActiveRecord并非全对象关系型映射层。
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