为了简化该实例，我们将只为 BankAccount 的几个属性和 TransactionHistory 实体建模。
To simplify the example, we will model only a few attributes of the BankAccount and TransactionHistory entities.
图4是一个实体关系图(Entity Relational Diagram, ERD)，给出了公司简化的数据需求及操作宏观视图。
Figure 4 presents an Entity Relational Diagram (ERD) that gives you the macro view of the company's simplified data requirements and operations.
在这里，有意地避免了使用实体bean，以简化这个示例的配置和设置。
The use of an entity bean is purposely avoided here to simplify the configuration and setup for this example.
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