Create the grid and perform data access using the EntityManager API.
创建网格并使用EntityManagerAPI执行数据访问。
Another important rule to follow is the entitymanager-per-request pattern.
另一个要遵循的重要规则就是entitymanager - per - request模式。
Create data classes and a utility class for getting an EntityManager instance.
创建数据类和一个实用类来获取EntityManager实例。
Line 1 obtains an EntityManager instance by one of the several available means.
第1行通过几种可用方法之一获取一个EntityManager实例。
Line 1 obtains an EntityManager instance by one of the several available means.
第1行通过几种可用方法之一获取一个EntityManager实例。
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