The procedure sets a savepoint named neworder.
该过程设置了一个名为 neworder 的保存点。
If there is an error, the program rolls back the transaction to the neworder savepoint.
如果出现错误的话，程序将把事务回滚到neworder保存点。
This rollback undoes all the operations that were performed after the neworder savepoint was set.
这个回滚将撤销在设置 neworder 保存点之后执行的所有操作。
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