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。
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.
变化的业务需求不断地要求向关系数据模型或面向对象模型中添加新实体和关系。
From time to time, the demands of changing business needs require that you add new entities and relationships to the relational data models or object-oriented models.
IT系统使用关系数据模型、大文件、面向对象模型和私有数据模型来对意义进行组织。
IT systems organize meanings using relational data models, flat files, object-oriented models, or proprietary data models.
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