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。
Returns an instance of the requested item type.
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。
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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