Append row

[skyhirider]

Is there a built in way to append rows to an existing spreadsheet?

I know I can get the row count and add a new one based on that, but was not able to find an easy append method that would do just that while streaming through large files with millions of rows across multiple tabs.

[ochedru]

No, fastexcel is designed to write workbooks from scratch. If you want to edit an existing workbook, you'd better use Apache POI.