Great Monks,

I've progressed with my quest for a script to calculate the averages of all columns. However, things are not working like I hoped. The final loop in my script "should" create a SELECT statement to calculate the average of the column (except the first one, but I'll try that later). It isn;t working though.
My output is getting close but looks like

ERWWCOMMUNITIES_Memory_Pages_sec, DBI::st=HASH(0x853cf7c)
ERWWCOMMUNITIES_NetworkInterface_CompaqEthernet_FastEthernetAdapter_Mo
+dule_BytesTotalPERsec, DBI::st=HASH(0x85457e8)
ERWWCOMMUNITIES_NetworkInterface_MSTCPLoopbackinterface_BytesTotalPERs
+ec, DBI::st=HASH(0x8545014)
[download]

My script:

#!/usr/bin/perl
    #use strict;
    use warnings;
    use DBI;
    use Text::CSV;

    # Connect to the database, (the directory containing our csv file(
+s))

    my $dbh = DBI->connect("DBI:CSV:f_dir=.;csv_eol=\n;");

    # Associate our csv file with the table name 'results'

    $dbh->{'csv_tables'}->{'results'} = { 'file' => 'test.csv'};


    #my ($avg) = $dbh->selectrow_array("SELECT avg(ERWWCOMMUNITIES_Mem
+ory_Pages_sec) FROM results");
    my $file = 'test.csv';

    my $csv = Text::CSV->new();
    open (CSV, "<", $file) or die $!;
    while (<CSV>) {
        next if ($. != 1);
        if ($csv->parse($_)) {
            @columns = $csv->fields();
        } else {
           my $err = $csv->error_input;
            print "Failed to parse line: $err";
        }
    }

    foreach $field (@columns) {
        ##print ("\$avg \= \$dbh\-\>selectrow_array\(\"SELECT avg\($fi
+eld\) FROM results\"\) \n");
        $avg = $dbh->prepare("SELECT avg($field) FROM results");
        print ("$field, $avg \n");
    }

    ###print ("$avg,\n");

    close CSV;
[download]

What am I doing wrong? Is there an easier way than what I've figured out?

---

---

• 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.