Message in Chinese (Simplified) (中文(简体))
无法更改对象状态。此异常可能是由于将一个或多个主键属性设置为 null 所导致的。尚未添加的对象不能包含 null 主键值。有关详细信息，请参阅内部异常。
Unlocalized message
The object state cannot be changed. This exception may result from one or more of the primary key properties being set to null. Non-Added objects cannot have null primary key values. See inner exception for details.
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