http://qs321.pair.com?node_id=111329

pitbull3000 has asked for the wisdom of the Perl Monks concerning the following question:

hi all you noble men, i just try to read in some data from a config file with following code and try to connect to a mysql database, but i always get the error, script could not connect to database. 
#!/usr/bin/perl


use strict;
use CGI;
use CGI::Carp qw(fatalsToBrowser);
use DBI;
use HTML::Entities;


my $db_config_file = "db.cfg";
my %db_config = ();
open CONFIG, ("< $db_config_file") or die "Konnte Datenbank Konfigurat
+ions Datei nicht &ouml;ffnen! $!";
my @config_pairs = <CONFIG>;
close CONFIG;
foreach (@config_pairs) {
    chomp $_;
    my ($key, $value) = split/:/, $_;
    $db_config{$key} = $value;
}
my $database = $db_config{'database'};
my $db_server = $db_config{'db_server'};
my $db_user = $db_config{'db_user'};
my $db_pass = $db_config{'db_pass'};

my $dbh = DBI->connect("dbi:mysql:$database:$db_server", "$db_user", "
+$db_pass") or die "Konnte Datenbankverbindung nicht herstellen: $!";

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if i read in the config file with the following code 
#!/usr/bin/perl


use strict;
use CGI;
use CGI::Carp qw(fatalsToBrowser);
use DBI;
use HTML::Entities;



my $db_config_file = "db.cfg";
my %db_config = ();
open CONFIG, ("< $db_config_file") or die "Konnte Datenbank Konfigurat
+ions Datei nicht &ouml;ffnen! $!";
my @config_pairs = <CONFIG>;
close CONFIG;
foreach (@config_pairs) {
    chomp $_;
    my ($key, $value) = split/:/, $_;
    $db_config{$key} = $value;
}
my $database = $db_config{'database'};
my $db_server = $db_config{'db_server'};
my $db_user = $db_config{'db_user'};
my $db_pass = $db_config{'db_pass'};

my $query = new CGI;

print $query->header();
print $query->start_html();
print $database . "<br>";
print $db_server . "<br>";
print $db_user . "<br>";
print $db_pass . "<br>";

print $query->end_html();

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it prints out the correct values-> 
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE html
    PUBLIC "-//W3C//DTD XHTML Basic 1.0//EN"
    "http://www.w3.org/TR/xhtml-basic/xhtml-basic10.dtd">
<html xmlns="http://www.w3.org/1999/xhtml" lang="en-US"><head><title>U
+ntitled Document</title>
</head><body>db29970540
<br>db07.puretec.de
<br>p7397271
<br>8vskBBPH<br></body></html>

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what is the error i do? update-> the config file looks like this: 
database:xxxxxx
db_server:yyy.yyyyy.yy
db_user:xxxxxx
db_pass:yyyyyy

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Replies are listed 'Best First'.
Re: problems with reading data from cfg file
by Jazz (Curate) on Sep 10, 2001 at 01:55 UTC
    What would be more helpful than "Konnte Datenbankverbindung nicht herstellen: $!" (which, according to babelfish means "Data base connection could not manufacture") would be to use DBI's $DBI::errstr, which will give you the exact connection problem. 

    my $dbh = DBI->connect("dbi:mysql:$database:$db_server", 
"$db_user", "$db_pass") or die "Error: $DBI::errstr $!\n";

    [download]

    I really, really hope that you didn't enter the real login info in your post. But if that was the real info (change it!), the $DBI::errstr was "Unknown MySQL Server Host (db07.puretec.de)".

    Jasmine

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[d/l]
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Re: problems with reading data from cfg file
by pitbull3000 (Beadle) on Sep 10, 2001 at 02:16 UTC
    no dont worry jazz, this is not my login data
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Re: problems with reading data from cfg file
by pitbull3000 (Beadle) on Sep 10, 2001 at 02:45 UTC
    i think i figured it out why i always get an error. the config file is written on a win32 box, and as i was told right now there is more than just \n at the end of the line, there is also a \r there, so i have to get rid of this also...
[reply]
      chomp will remove only the newlines based on the current value of $\ which is the OUTPUT_RECORD_SEPARATOR (in English)

      If the file was written on win32 (where $\ defaults to \n\r) and then uploaded to unix (where $\ defaults to \n), chomp only catches the \n and misses the \r.

      So you can do this: 

      foreach ( @config_pairs ) {

    chomp;
    s/\r//;

    # more stuff
}

      [download]

      Jasmine

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[d/l]
[select]
        yep, thanks jazz. already put some nice regex into my loop, and now it just works fine.... ;.D
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