博客介绍了Value Object和Data Access Objects的使用场景。使用Value Object可减少对企业Bean的调用，用其来保存数据；使用Data Access Objects需将数据访问代码封装在其中，该类包含访问数据的SQL等代码，还可用子类处理特定数据库供应商的SQL。
When to Use Value Object?
1. When possible reduce the number of calls to the enterprise beans
2. This implies coarse-grained enterprise beans
3. Use value objects to hold data
When to use Data Access Objects
1. Encapsulate data access code in data access objects
2. This class contains all the portable SQL or other code to access data
3. Use sub-classes of the data-access class to handle SQL specific to a database vendor
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