dropwizard：如何使用连接处理映射器的查询

Question

这更像是一个设计问题，所以我知道我会收到很多抨击，但我有点困惑。 在Dropwizard中，我们使用DAO对象来声明我们想要运行的SQL查询，使用Mapper将它们映射到对象。

现有结构：

- StudentPOJO
- StudentMapper for all StudentPOJO fields
- StudentDAO which has all the "select * from student where ..." calls. 

改变 -

- StudentDAO now has to have a query that says "Selct a.*, b.name from student a, subjects b where ...."
- Now to get this information I need to 
    - make changes to both Mapper and POJO 
    OR
    - create new Mapper and POJO (or extend the existing POJO and add the new params to the child POJO)

这种情况的通常规范是什么？这种情况的利弊是什么？