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。
You can put the data classes in the project folder.
可将数据类放在项目文件夹中。
In that case, you must provide that namespace when you connect to the data classes.
在此情况下，必须在连接至数据类时提供该命名空间。
Data classes that have been identified for each column.
每列标识出来的数据类。
Data classes that have been identified for each column.
每列标识出来的数据类。
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