If you want to follow along in code, install a relational database manager, Ruby, and Rails version 1.1 or greater.

如果想试验这里的代码，请安装一个关系数据库管理器、Ruby和Rails 1.1以上版本。

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The EJB container, persistence manager and the relational resource adapter and database work together to control the concurrency.

ejb容器、持久性管理程序、相关资源适配器和数据库将联合起来对并发性(concurrency)进行控制。

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Our vision is to manager 3D spatial objects by relational database management system and to manipulate the 0-dimensional object, 1 -dimensional, 2-dimensional, and 3 -dimensional in unifiable manner.

研究中，我们把三维空间中的0维对象、1维对象、2维对象和3维对象纳入了统一的处理框架，为利用现有的数据库技术处理复杂的地理数据探索出一条可行的途径。

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