Hibernate允许查询的定义覆盖关联的默认抓取策略。
Hibernate lets the definition of a query override the default fetching strategy for associations.
更改摘要API允许查询图中的所有对象的设置，并确定是否已经对其进行了更改。
The change summary API allows you to query the Settings of all the objects in your graph and assess whether they have been changed or not.
即使SimpleDB不允许查询中进行域联合，您也仍然可以在域中使用关联项。
Even though SimpleDB doesn't permit domain joins in queries, you can still have related items across domains.
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