What happens to an OODBMS when the code that defines the objects it stores changes?

当定义其中所存储的对象的代码发生改变时，OODBMS会怎样？

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Fortunately, the db4o system, like most OODBMS systems, has an integral understanding of inheritance.

幸运的是，与大多数OODBMS系统一样，db4o系统对继承有一个完整的理解。

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Understanding how an OODBMS like db4o stores associated objects held through references is a tricky business.

理解像db4o这样的OODBMS是如何通过引用存储相关对象，是比较复杂的事情。

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