In other words, how will db4o react if I run an existing Person-based query against the database when no Mood instances are stored (shown in Listing 5)?
换句话说，当数据库中没有存储Mood实例时，如果在数据库上运行一个基于已有的Person的查询，db4o将如何作出响应(见清单5)？
In other words, how will db4o react if I run an existing Person-based query against the database when no Mood instances are stored (shown in Listing 5)?
换句话说，当数据库中没有存储Mood实例时，如果在数据库上运行一个基于已有的Person的查询，db4o将如何作出响应(见清单5)？
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