表bookorder(订单表)中有3个字段，分别为：userId(乘客id),cityid(城市id)和[size=14]price(单次消费金额)。
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When you roll back the transaction in Listing 2, the message received is restored in the queue bookorder and the row will also be removed from shipping_tab.
当回滚清单2中的事务时，接收到的消息被恢复到队列bookorder中，这一行将从shipping _ tab中删除。
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