Solved

problem when hash value is null

Posted on 2007-11-27
10
150 Views
Last Modified: 2010-03-05
I am retrieving a resultset from the database and pushing the data to hash.

push @{$h{$data[1]}{$data[0]}{$data[2]}{$data[3]}},@data[4,5];

This works fine if the data in 4th and 5th field is not null. But if it is null. The hash is not retrieving the result. Please help
0
Comment
Question by:saibsk
  • 5
  • 3
  • 2
10 Comments
 
LVL 39

Expert Comment

by:Adam314
ID: 20361442
What do you want to put in your hash when 4th and 5th fields are null?
0
 

Author Comment

by:saibsk
ID: 20361483
I am writing the data to a file. So when the data fields 1, 0, 2, 3 are same I group them and the corresponding 4th and 5th values are written to a file. But when the 4th and 5th fields are null. That record from the result set is not being written to the file.  If the 4th and 5th fields are null I want to write empty strings with corresponsing 0,1,2,3 fields to the file.
0
 

Expert Comment

by:shayne321
ID: 20361686
This would be one way:

$val1 = $data[4] || '';
$val2 = $data[5] || '';

push @{$h{$data[1]}{$data[0]}{$data[2]}{$data[3]}}, ($val1, $val2);

In this way if the 4th and 5th fields are undefined the "or" condition will evaluate to an empty string ('')
0
 

Accepted Solution

by:
shayne321 earned 500 total points
ID: 20361707
Or, without using temporary variables:

$data[4] = '' unless (defined $data[4]);
$data[5] = '' unless (defined $data[5]);
push @{$h{$data[1]}{$data[0]}{$data[2]}{$data[3]}},@data[4,5];
0
 

Author Comment

by:saibsk
ID: 20361782
doesn't work. Problem still exists. Please advise.
0
How to run any project with ease

Manage projects of all sizes how you want. Great for personal to-do lists, project milestones, team priorities and launch plans.
- Combine task lists, docs, spreadsheets, and chat in one
- View and edit from mobile/offline
- Cut down on emails

 
LVL 39

Expert Comment

by:Adam314
ID: 20361785
How are you writing the data to a file?  Post the code for that part of your program.
0
 

Author Comment

by:saibsk
ID: 20361805
for my $key1 (sort keys %h) {      
      
            print FH "\n#Group $key1 Accounts\n";
                  for my $key0 (sort keys %{$h{$key1}}){
                  for my $key2 (sort keys % {$h{$key1}{$key0}}){
                        for my $key3 (sort keys % {$h{$key1}{$key0}{$key2}}){
                              #print "\@\$h{$key1}{$key0}{$key2}{$key3} = @{$h{$key1}{$key0}{$key2}{$key3}}\n";
                  
                  @arr = ($key0,$key1,$key2,$key3,@{$h{$key1}{$key0}{$key2}{$key3}});
            print FH join("\t,",@arr)."\n";
            }
      }
}
      print FH "\n";      
}
0
 
LVL 39

Expert Comment

by:Adam314
ID: 20361862
push @{$h{$data[1]}{$data[0]}{$data[2]}{$data[3]}},[@data[4,5]];
0
 

Author Comment

by:saibsk
ID: 20365540
Doesn't seem to work
0
 

Author Comment

by:saibsk
ID: 20365859
I had to make few changes to the resultset with that shayne321 solution works.
0

Featured Post

6 Surprising Benefits of Threat Intelligence

All sorts of threat intelligence is available on the web. Intelligence you can learn from, and use to anticipate and prepare for future attacks.

Join & Write a Comment

Suggested Solutions

Email validation in proper way is  very important validation required in any web pages. This code is self explainable except that Regular Expression which I used for pattern matching. I originally published as a thread on my website : http://www…
I have been pestered over the years to produce and distribute regular data extracts, and often the request have explicitly requested the data be emailed as an Excel attachement; specifically Excel, as it appears: CSV files confuse (no Red or Green h…
Explain concepts important to validation of email addresses with regular expressions. Applies to most languages/tools that uses regular expressions. Consider email address RFCs: Look at HTML5 form input element (with type=email) regex pattern: T…
Polish reports in Access so they look terrific. Take yourself to another level. Equations, Back Color, Alternate Back Color. Write easy VBA Code. Tighten space to use less pages. Launch report from a menu, considering criteria only when it is filled…

758 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question

Need Help in Real-Time?

Connect with top rated Experts

18 Experts available now in Live!

Get 1:1 Help Now