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Adding data into Hashes

why_perl
Novice

Jan 16, 2005, 1:06 PM

Post #1 of 3 (847 views)

Adding data into Hashes	Can't Post

Thanx KevinR for your replies on my last thread.

What is the best way to add data from a flat-file DB to a hash?

e.g.

Let's say I have a FF DB with the contents:

Header:
Item1|Item2|
Footer:
Item1|Item2|

Basically, i'm trying to figure out how the easiest most reliable way of referencing specific data from the FF DB.

In the above example, I would like to have the ability to reference "Header" which will give me the data in the line that's below it. Same for "Footer."

Thanx!

KevinR
Veteran

Jan 16, 2005, 3:38 PM

Post #2 of 3 (841 views)

Re: [why_perl] Adding data into Hashes [In reply to]	Can't Post

here is one way, if you are sure of the data file being in the correct format:

Code

open (FILE,"yourfile.xxx") or die "$!"; 
my %hash = <FILE>; 
close FILE; 
 
print "$hash{'Header:'}"; 
print "$hash{'Footer:'}";

the keys and values will still have the newlines on the end so you may need to chomp them if its a problem.
-------------------------------------------------

(This post was edited by KevinR on Jan 16, 2005, 3:44 PM)

davorg
Thaumaturge / Moderator

Jan 17, 2005, 6:15 AM

Post #3 of 3 (834 views)

Re: [why_perl] Adding data into Hashes [In reply to]	Can't Post

I'd be tempted to add a couple more steps to KevinR's answer.

Code

open (FILE,"yourfile.xxx") or die "$!";  
my @file = <FILE>;  
close FILE;  
  
chomp @file; # remove newlines 
s/:$// for @file; # remove : from keys 
 
my %hash = @file; 
 
print $hash{Header};  
print $hash{Footer};

--
Dave Cross, Perl Hacker, Trainer and Writer
http://www.dave.org.uk/
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