Brethren,

I am using DBD::mysql and reading connection parameters from MySQL defaults files, and it is MOSTLY working. I've been doing it for years, with code similar to the following: 

sub open_db
{
    my ($dsn, $dbh, $defaults);
    
    $defaults = (defined $opts{defaults} && -f $opts{defaults})
              ? $opts{defaults}
              : (-e $ENV{HOME}.'/.my.cnf')
              ? $ENV{HOME}.'/.my.cnf'
              : (-e '/root/.my.cnf')
              ? '/root/.my.cnf'
              : (-e './.my.cnf')
              ? './.my.cnf'
              : 'NOTFOUND';

    die "No valid defaults file found!" if ($defaults eq 'NOTFOUND' &&
+ !defined $opts{host});
    
    $dsn = defined $opts{host} && defined $opts{port}
         ? sprintf("DBI:mysql:mysql:host=%s;port=%d;mysql_read_default
+_file=%s;mysql_read_default_group=mysql;",
                   $opts{host},
                   $opts{port},
                   $defaults)
         : defined $opts{host}
         ? sprintf("DBI:mysql:mysql:host=%s;mysql_read_default_file=%s
+;mysql_read_default_group=mysql;",
                   $opts{host},
                   $defaults)
         : defined $opts{socket} && -e $opts{socket}
         ? sprintf("DBI:mysql:mysql;mysql_read_default_file=%s;mysql_r
+ead_default_group=mysql;mysql_socket=%s;",
                   $defaults,
                   $opts{socket})
         : sprintf("DBI:mysql:mysql;mysql_read_default_file=%s;mysql_r
+ead_default_group=mysql;",
                   $defaults);

    $dbh = DBI->connect($dsn, undef, undef, {RaiseError => 1, AutoComm
+it => 0});
    $dbh->do(sprintf('SET SESSION wait_timeout = %d',
                     $opts{interval} > 3500 ? $opts{interval} + 100 : 
+3600)) || die "Could not set session wait_timeout";

    return ($dbh);
}

[download]

Now, the one respect in which this is not working is that it ignores a host specified in the defaults file. Username is picked up correctly, password is picked up and used, host is ignored.

Can anyone tell me why this should be?

In reply to Reading host from defaults file with DBD::mysql by Llew_Llaw_Gyffes

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