The code:
________________________________
From: Jim Gibson <jimsgib...@gmail.com>
To: beginners@perl.org
Sent: Fri, 9 October, 2009 11:00:55 AM
Subject: Re: Building a record on the fly via hash of hashes
At 10:14 PM -0700 10/8/09, Soham Das wrote:
> Hello All, I am doing some file reading operation, and parsing the data(its a
> CSV file) with a hash reference and then intend to store it in a record.
> something like: loop: until file ends;
> $hashref->{'A'}=$filehandle->{'Action'}; $hashref->{'B'}=
> $filehandle->{'Name'}; $hashref->{'C'}= $filehandle->{'System'};
> $hashref->{'D'}=($filehandle->{'Price'}); $recordref->{$hashref->{'B'}}=
> $hashref; loop : ends
You are better off including some actual Perl code, including some sample data.
> Here Action, Name,System,price are the CSV headers. Now, when the first line
> is read, the details are parsed and stored in the $recordref as a hash
> reference. Now when the loop iterates, and goes to the second line. The first
> line contents are lost. Because the hash reference now points to the newer
> data. How do I overcome this? More importantly do we have a push equivalent
> for hash of hashes?
No. Unless each record has a unique key, you are better off using an array of
hashes, rather than a hash of hashes. Of course, you could use the line number
as a unique key, but an array would be more efficient.
-- Jim Gibson
j...@gibson.org
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