On 12/20/19 4:32 PM, Meketon, Marc via Bug reports for GLPK (GNU Linear Programming Kit) wrote:
I am having problems with the Excel driver for writing results. It is not properly clearing out old results.Since I’m on 64-bit hardware and operating system, I need to use the newer versions of Excel (that ones that write to .xlsx files). I am also on Windows 10. Using the latest GLPK build (4.65), I modified the example sudoku_excel.mod by these two changes: In line 50: 'DRIVER={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)};dbq=.\sudoku.xlsx' And in line: 'DRIVER={Microsoft Excel Driver (*.xls, *.xlsx, *.xlsm, *.xlsb)};READONLY=FALSE;dbq=.\sudoku.xlsx' Also, I saved the existing sudoku.xls into the newer format and called it sudoku.xlsx When I run the problem **twice** from the examples\sql directory, using the command line: ..\..\w64\glpsol.exe --model sudoku_excel.mod I find that the solution has 81 blank rows, then the solution starts on row 83. So while the ‘UPDATE’ statement clear out the old results, it begins to put the new results below.
Hello Marc, I think this problem is not new. The Excel driver does not support delete as mentioned in sudoku_excel.mod. For productive use I would suggest to use a SQL database like MariaDB. How did you get ODBC finally running with Excel after all the problems you got into? Best regards Heinrich
