在这个图书馆应用程序中，需要为Book实体添加查询工具以便返回指定作者的所有书籍。
In this library application, a finder needs to be added to the Book entity to return a collection of Books for a given Author's name.
在这个图书馆应用程序中，需要为Book实体添加查询工具以便返回指定作者的所有书籍。
In this library application, a finder needs to be added to the Book entity to return a collection of Books for a given Author's name.
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