The sample script defines data for the cahrt as under

You already have data from database, there is no more mapping left

How do I map my data that is retrieved from the database to the chart ?

Do you have microsoft excel installed? Have you ever created a chart using microsoft excel? Have you read http://search.cpan.org/dist/Spreadsheet-WriteExcel/lib/Spreadsheet/WriteExcel.pm#Cell notation

I suggest you drop what you're doing and create a chart using the GUI tools so you can see what is involved

I don't have excel so I cant help