hash or arrays

Anonymous Monk has asked for the wisdom of the Perl Monks concerning the following question:

I have a table that produces the following results:

  DIR     FILE_NAME
| 954  |   24088954 |
| 955  |   24052955 |
| 955  |   24111955 |
| 955  |   24130955 |
| 956  |   23159956 |
| 957  |   24133957 |
| 958  |   24131958 |
| 960  |   24093960 |
| 961  |   24033961 |
| 961  |   24129961 |
| 961  |   24130961 |
[download]

I am trying to create a hash of these values based on the directory:

955 -> 24052955, 24111955, 24130955
961 -> 24033961, 24122961, 24130961

I am guessing that I need to hash the directory, but then have an array as the value of the hash

The problem I have is that when I did

$file_hash->{$dir}{push(@file_array,$file_name)};
[download]

I get duplicates


foreach my $file_dir (sort (keys % {$file_hash}))
{
  foreach my $file (@file_array){
        print "$counter Directory: $file_dir $file\n";
        $counter++;
                                                                      
+                  } 
                                                                      
+          } 

1 Directory: 000 24090000
2 Directory: 000 24125002
3 Directory: 000 24011003
4 Directory: 000 24070003
5 Directory: 000 24082003
6 Directory: 000 24065005
7 Directory: 000 24070007
8 Directory: 000 24132007
9 Directory: 000 24041008
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As you can see, the second record here doesn't belong (the last three digits of the file name correspond to the directory).

So it would seem that I need to pre-define 1000 different arrays, one for each directory, and then do an if statement to push the values into the approriate array,but I am sure there is a better way to handle this.

Comment on hash or arrays Select or Download Code

Replies are listed 'Best First'.
Re: hash or arrays by cLive ;-) (Prior) on Oct 03, 2004 at 19:28 UTC
Nearly there: `push @{ $file_hash->{$dir} },$file_name; foreach my $file_dir (sort keys %{$file_hash}) { foreach my $file (@{ $file_hash->{$dir} }) { print "$counter Directory: $file_dir $file\n"; } }` [download] cLive ;-)	[reply] [d/l]
Re^2: hash or arrays by Anonymous Monk on Oct 03, 2004 at 19:47 UTC
This is beautiful. Works like a champ. Greatly appreciated.	[reply]
Re: hash or arrays by Arunbear (Prior) on Oct 03, 2004 at 19:27 UTC
Given $file_hash, $dir and $file_name, do the insertion like this: `push @{ $file_hash->{$dir} }, $file_name;` The arrays that $file_name are pushed into will be created automagically by Perl. Then to create the report: `foreach my $file_dir (sort keys %{$file_hash}) { foreach my $file (@{ $file_hash->{$file_dir} }){ print "$counter Directory: $file_dir $file\n"; $counter++; } }` [download]	[reply] [d/l] [select]