2teez
Novice
Sep 26, 2013, 5:55 AM
Post #2 of 4
(504 views)
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Re: [Tejas] Comparing 2 Huge Csv Files and Find the Mismatched Rows
[In reply to]
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Hi Tejas,
Since you are working with a CSV files the rule of thump is to ask you to check how to use a CSV module like Text::CSV_XS http://search.cpan.org/~hmbrand/Text-CSV_XS-1.01/CSV_XS.pm. But one can simply use split function in perl to work this dataset presented like so:
use warnings;
use strict;
use Inline::Files;
my %id1;
while (<DATA2>) {
chomp;
my @lines = split /,/, $_;
push @{ $id1{ $lines[0] } }, @lines[ 1 .. $#lines ];
}
<DATA1>; # take out the header if not needed
while (<DATA1>) {
chomp;
next if /^$/; # next on blanck line
my @lines2 = split /,/, $_;
if ( exists $id1{ $lines2[0] }) {
if ( $id1{ $lines2[0] }->[0] eq $lines2[1] ) {
print $_,"Matched", $/;
}
else{
print $_,"Mis-matched comparing: ",
$id1{ $lines2[0] }->[0],' with ',$lines2[1], $/;
}
}else{
print $_," doesn't exist in second file",$/;
}
}
__DATA1__
ID1 ,AMT, ID2
CDZNYQ9R8108QR3E3EJ0,3900.00,351
V0Y9WC7YYJ6V8T3DDJM0,3900.00,351
BZ6FD9Q3964VX16EMKY0,3900.00,351
3S5VCXSSS0PPV9V875Q1,3900.00,351
687802764243,399.00,362
__DATA2__
BZ6FD9Q3964VX16EMKY0,900.00,351
3S5VCXSSS0PPV9V875Q1,900.00,351
V0Y9WC7YYJ6V8T3DDJM0,900.00,351
CDZNYQ9R8108QR3E3EJ0,900.00,351
Please, note that for the above codes to work you must have the module Inline::Files installed. If not you might have to open the two files using two separate open functions.
A closer look at the codes above show the use of two similar while loops which some would consider a repetition, so in that case one might do the following:
use warnings;
use strict;
die "Usage: perlscript.pl file1 file2 " unless @ARGV == 2;
my ( $file1, $file2 ) = @ARGV;
my %id1;
my %file_operation = (
$file1 => sub {
return if $_[0] =~ /^$|^\bID1\b/; # next on blanck line or header
my @lines2 = split /,/, $_[0];
if ( exists $id1{ $lines2[0] } ) {
if ( $id1{ $lines2[0] }->[0] eq $lines2[1] ) {
print $_[0], "Matched", $/;
}
else {
print $_[0], "Mis-matched comparing: ",
$id1{ $lines2[0] }->[0], ' with ', $lines2[1], $/;
}
}
else {
print $_[0], " doesn't exist in second file", $/;
}
},
$file2 => sub {
my @lines = split /,/, $_[0];
push @{ $id1{ $lines[0] } }, @lines[ 1 .. $#lines ];
},
);
open_file( $_, $file_operation{$_} ) for ( $file2, $file1 );
sub open_file {
my ( $filename, $code_ref ) = @_;
open my $fh, '<', $filename or die $!;
while (<$fh>) {
chomp;
$code_ref->($_);
}
}
Hope this helps.
(This post was edited by 2teez on Sep 26, 2013, 6:38 AM)
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