Something like the following should work:
format RECEIPT_TOP =
Item Quantity Price
--------------------------------------------
.
format RECEIPT =
@<<<<<<<<<<<<<<<<<<<<< @<<<<< @####.##
@format_row
.
for my $row_ref ( @$cartItemsRef ) {
@format_row = @$row_ref;
write RECEIPT; # this writes to the filehandle RECEIPT
}
You can read up more on formats with perldoc perlform.
And maybe you should consider another solution altogether like using a templating system, e.g. TT2 or Text::Template.
Update: The code above only works if you retreive exactly these three columns (in the order you use them in the template) from the database. Otherwise the @format_row = ... line has to be adjusted accordingly.
-- Hofmator
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