If the available quantity from the stock table for the requested item is less than the quantity ordered, the transaction rolls back to the neworder savepoint.
如果所请求商品在stock表中的可用数量小于订购的数量，那么事务将回滚到neworder保存点。
When overridden in a derived class, returns an instance of the requested item type.
在派生类中重写时，返回所请求的项类型的实例。
When overridden in a derived class, returns an instance of the requested item type.
在派生类中重写时，返回所请求的项类型的实例。
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