Beefy Boxes and Bandwidth Generously Provided by pair Networks
Your skill will accomplish
what the force of many cannot
 
PerlMonks  

comment on

( [id://3333]=superdoc: print w/replies, xml ) Need Help??
Author: Alan Citterman

I had a project where I needed to extract data from a file and send
it to a customer. The file in question was from a database, and it
had been exported to a CSV text file.

I would have tried to write my own regular expression to handle this,
but my overall knowledge of Perl isn't that good. However, after some
research, I found a reference to this module.

#!/usr/bin/perl use strict; use Text::CSV;
I knew that the text file had lines of data that I didn't need, and
that there was an easily recognizable pattern in those lines, so I could
use a regular expression to put those lines into a trash file.

my $input="input.csv"; my $output="output.txt"; my $trash="trashfile"; my $csv=Text::CSV->new(); #Creates a new Text::CSV object open(INFILE,$input) || die "Can't open file $input"; open(OUTFILE,">$output") || die "Can't open file $output"; open(TRASH,">$trash") || die "Can't open file $trash";

Now to start reading the data from the file, store it in the $_ variable
and print it to the trash file if its not good, or parse the variable, and
print it to the output file if it is.

while (<INFILE>) { if (/"X"/) { #The trash data has these 3 characters in it print TRASH "$_\n"; } else { #Now to deal with the data I want to keep if($csv->parse($_)) { #checks to see if data exists in $_ and +parses it if it does my @fields=$csv->fields; # puts the values from each field in an +array my $elements=@fields; #gets the number of elements in the arra +y for ($x=0;$x<$elements;$x++) { print OUTFILE "$fields[$x]\t"; } } } }
Now that the files have been written to, I can close them up, and remove
the trash file

close INFILE; close OUTFILE; close TRASH; unlink $trash;
All in all, a very useful module.

In reply to Text::CSV by TStanley

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post; it's "PerlMonks-approved HTML":



  • Are you posting in the right place? Check out Where do I post X? to know for sure.
  • Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
    <code> <a> <b> <big> <blockquote> <br /> <dd> <dl> <dt> <em> <font> <h1> <h2> <h3> <h4> <h5> <h6> <hr /> <i> <li> <nbsp> <ol> <p> <small> <strike> <strong> <sub> <sup> <table> <td> <th> <tr> <tt> <u> <ul>
  • Snippets of code should be wrapped in <code> tags not <pre> tags. In fact, <pre> tags should generally be avoided. If they must be used, extreme care should be taken to ensure that their contents do not have long lines (<70 chars), in order to prevent horizontal scrolling (and possible janitor intervention).
  • Want more info? How to link or How to display code and escape characters are good places to start.
Log In?
Username:
Password:

What's my password?
Create A New User
Domain Nodelet?
Chatterbox?
and the web crawler heard nothing...

How do I use this?Last hourOther CB clients
Other Users?
Others chanting in the Monastery: (6)
As of 2024-03-29 09:50 GMT
Sections?
Information?
Find Nodes?
Leftovers?
    Voting Booth?

    No recent polls found