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。

youdao

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。

youdao