Object relational mapping refers to the technique of mapping the data representation from an object model to a relational data model with a SQL-based schema.

用基于 SQL 的模式可以把数据呈现从对象模型映射到关系数据模型，对象关系映射引用了这项技术。

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JPA is a simplified programming model used for object relational mapping and data persistence.

JPA是一个用于对象关系映射以及数据支持的简化程序模型。

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Plus, you would have to write additional code in the middle tier to map the relational data to an Object data Model or an XML data Model.

另外，必须在中间层中编写更多代码，将关系数据映射到对象数据模型或XML数据模型。

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