After the quantity check, the procedure tries to fetch next from the cursor, but if the rollback occurred, this causes an error because the rollback closed the cursor.

检查完数量后，过程将尝试从指针中获取下一个订单，但是如果发生了回滚，将会产生一个错误，因为回滚关闭了指针。

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While you can change value during the life of the cursor, the change only affects the number of records in the cache after the next fetch from the data source.

虽然您可以在资料指标的存留期间变更值，但变更只会在下一次从资料来源撷取资料录之后，影响快取中的资料录数目。

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