Using perl to update mysql table on certain event

anon209 · 02-06-2011, 01:59 PM

I'd like to use a perl script to update a fields in mysql database when pianobar (command line pandora radio player) starts a new song. Pianobar has the ability to run a script based on events, I'd like to take advantage of and use perl to parse the artist,song,album and update the corresponding fields. Then later retrieve them and display them with php/html. I am by no means proficient with perl. I started to use bash, but it looks like perl will be much more efficient and and less time consuming.

Code:

#! /usr/bin/perl -wT

use strict;
use DBI;

$ENV{PATH} = "/bin:/usr/bin";
delete @ENV{'IFS', 'CDPATH', 'ENV', 'BASH_ENV'};

if (my $action = shift @ARGV)
{
	if ($action eq 'songstart')

my $dbh = DBI->connect('DBI:mysql:database=PandoraMusic;host=localhost','username','password')
  or die "Cannot connect: " . $DBI::errstr;

$sql = qq`SELECT artist,song,album,time FROM pandora WHERE otherfield=1`;
$sth = $dbh->prepare($sql) or die "Cannot prepare: " . $dbh->errstr();
$sth->execute() or die "Cannot execute: " . $sth->errstr();
my ($artist,$song,$album,$time) = $sth->fetchrow_array();
$sth->finish();

print "Artist is $artist , Song is $song , Album is $album was played at $time\n";

if (@fields != 0) {
  my $i=0;
  foreach $line (@fields) {
    print "row $i - a is @$line[0] , b is @$line[1] , c is @$line[2] \n";
    $i++;
  }
}


$sql = qq`UPDATE pandora SET field=1 WHERE otherfield=2`;
$sth = $dbh->prepare($sql) or die "Cannot prepare: " . $dbh->errstr();
$sth->execute() or die "Cannot execute: " . $sth->errstr();
$sth->finish();


$sql = qq`SELECT artist FROM table pandora name=username AND password=password`;
$sth = $dbh->prepare($sql) or die "Cannot prepare: " . $dbh->errstr();
$sth->execute($name, $password) or die "Cannot execute: " . $sth->errstr();
my $field = $sth->fetchrow_array();
$sth->finish();

I just want the perl script to update the feilds when the song changes. If anyone can help me out I'd really appreciate it.

TIA

goossen · 02-07-2011, 05:56 AM

Can you post the error you are getting or what is the problem with the script you posted ?

anon209 · 02-07-2011, 05:39 PM

use of uninitialized value in concatenation (.) or string at line 54. Can someone point me in the right direction?

Code:

#!/usr/bin/perl

use DBI;
use strict;
use warnings;

# Declare varaibles
my $DBNAME   =  "Test";
my $DBTABLE  =  "Pandora";
my $DBUSER   =  "slacker";
my $DBPASS   =  "password";
my $DBHOST   =  "localhost";
my $csvfile  =  "/tmp/nowplayingtest.csv";

# Connect to database at hand, or die
my $dbh = DBI->connect("DBI:mysql:$DBNAME:$DBHOST", $DBUSER, $DBPASS);

open (INFILE, "/tmp/nowplayingtest.csv") or die "Can't open file!";
while (<INFILE>)
  {
   my @rows = split(';', $_);
   
 my $artist  =  $rows[0];
 my $title   =  $rows[1];
 my $album   =  $rows[2];

   $dbh->do(qq/insert into "$DBTABLE" (Artist, Title, Album) values ($artist, $title, $album/) or warn "failed to insert $artist, $title, $album into table - $dbh->errstr" if ($@);

my $res = $dbh->selectall_arrayref( q( SELECT Artist, Title, Album FROM Pandora));

foreach( @$res ) {
	print "\n$_->[0], $_->[1] $_->[2] $_->[3]\n\n";

	}
}

An example of the CSV file is as follows. Contrary to to normal CSV files, this doesn't have a the field names on the first row.

Code:

Ray Charles;I Got A Woman;Golden Legends

Cheers
TIA