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SDO_DataObject::getSequence — Get the sequence for a data object
此函数是实验性的。此函数的表象，包括名称及其相关文档都可能在未来的 PHP 发布版本中未通知就被修改。使用本函数风险自担 。
Return the SDO_Sequence for this SDO_DataObject. Accessing the SDO_DataObject through the SDO_Sequence interface acts on the same SDO_DataObject instance data, but preserves ordering across properties.
None.
The SDO_Sequence for this SDO_DataObject, or returns NULL if the SDO_DataObject is not of a type which can have a sequence.