Language Reference Guide : System Classes : DataStream Class : PrevRow Method
 
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PrevRow Method
The PrevRow method backs up to the previous row in the cached sequence, positioning that row to be loaded into fields or variables.
This method has the following syntax:
status = DataStream.PrevRow()
The QueryMode attribute (see QueryMode Attribute) must be QY_CACHE.
If the PrevRow method is successful, it returns ER_OK. If it is not successful, it returns an error status. Descriptions of system constant values and their numeric equivalents are listed in Error Codes.