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Re^6: Merging Two CSV files Based on Two Columns

by TheCanadian (Initiate)
on Sep 19, 2012 at 16:17 UTC ( #994478=note: print w/ replies, xml ) Need Help??


in reply to Re^5: Merging Two CSV files Based on Two Columns
in thread Merging Two CSV files Based on Two Columns

Hi: Tux

I finally, with your help got the script to work. I discovered that the common column had to have the same column header. Your line below with the || really helped because it turned out there were 203 usernames from final.csv that were not found in the HCDir.csv; this trapped the error instead of displaying a blank CSV file. Lastly, I needed to turn off "use strict" because it produces the following error.

Global symbol "%File1Map" requires explicit package name at completed. +pl line 15 . Global symbol "%File1Map" requires explicit package name at completed. +pl line 28 . Global symbol "%File1Map" requires explicit package name at completed. +pl line 29 . Execution of completed.pl aborted due to compilation errors.

Other than that the script worked great. Below is a copy of my modified script.

#!F:\strawberry-perl-5.16.1.1\perl\bin\perl -w #use strict; use warnings; use Text::CSV_XS my %File1Map; my %File2Map; my $csv = Text::CSV_XS->new ({ binary => 1, auto_diag => 1, allow_whit +espace => 1 }); open my $fh1, "<", "final.csv" or die "final.csv: $!"; $csv->column_names ($csv->getline ($fh1)); # Read the header line while (my $row = $csv->getline_hr ($fh1)){ $File1Map{$row->{username}} = $row->{date_modified}; } open my $fh2, "<", "HCDir.csv" or die "HCDir.csv: $!"; $csv->column_names ($csv->getline ($fh2)); # Read the header line while (my $row = $csv->getline_hr ($fh2)){ $File2Map{$row->{username}} = $row->{branch}; } $csv->eol ("\n"); # Now use it for output open my $fh3, ">", "completed.csv" or die "completed.csv: $!"; $csv->print ($fh3, [qw( username date_modified branch)]); foreach my $username (sort keys %File1Map) { $csv->print ($fh3, [ $username, $File1Map{$username}, $File2Map{$u +sername} || +"Not Found In HCDir!" ]); } close $fh1; close $fh2; close $fh3;

I want to thank you again, I am really new to PERL and I learn primarily through examples. Without your help I would still be lost. I like PERL and would like to continue using PERL. I also purchased the Fourth Edition of "Programming Perl" by Tom Christiansen, Brian d Foy, and Larry Wall; dated 2012. I gather this is the Bible but it did not help with my specific situation.

Yours truly,

TheCanadian 20120919-1207 :-}


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