If the underlying driver does not support transactions, a PDOException will be thrown (regardless of your error handling Settings: this is always a serious error condition).
如果底层驱动程序不支持事务，那么将会抛出一个PDOException(无论错误处理设置是怎样的：这总是一个严重错误状态)。
Because of lacking necessary examining condition in RTK measurement, some error operation or improper technological treatment would bring badly serious influence on measurement achievement.
但是，RTK测量缺少必要的检核条件，作业时如果操作失误或某些技术问题处理不当，都会给测量成果带来严重影响。
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