记录集是记录的集合，行为类似于对象。
Recordset objects, which are sets of records that behave as objects.
获取当前记录的集合中的全部属性字段。
Gets all the attribute fields in the collection for the current record.
在批处理中，修改主文件的全部修改记录的集合所构成的文件。
A file which is a collection of change records used to update a master file in batch processing.
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