Storable and MLDb

[saintex]

Hello Monks,
I have a problem with Storable and MLDb... substantially, because I have not confidence with these modules.

I use a mailing list software that I love, but I have a problem with data format.
This software store data not with a RDBM database, but using MLDb and Storable.

I need to create a connector (I can: this software is Open Source) in order to connect it to my personal website, but I'm not able to manipulate data with those two modules.

Ok, I go to the code,
That software use:

use Fcntl qw(
O_WRONLY 
O_TRUNC 
O_CREAT 
O_CREAT 
O_RDWR
O_RDONLY
LOCK_EX
LOCK_SH 
LOCK_NB);

use MLDBM qw(AnyDBM_File Storable);

and these are some rows, the software use to store data:

my $dbm = tie %{$self->{DB_HASH}}, 'MLDBM', $self->_db_filename, O_CRE
+AT|O_RDWR, FILE_CHMOD

then with that row, it read the file:

sysopen(DB_SCHEDULE_SAFETYLOCK, $self->_lockfile_name,  O_RDWR|O_CREAT
+, FILE_CHMOD )

I think these are all the rows involved in data storage.
If you are interesting in, the modules are these ones:

MLDb.pm
Schedules.pm

I need to read the generated files, in order to write or append there some data.

I tried in several way to read that file, but without success.
For example with:

 
use MLDBM qw(AnyDBM_File Storable);
use Storable qw(retrieve_fd);
use Fcntl qw (:DEFAULT :flock);
use FindBin qw($Bin);

tie (%hash, "MLDBM", $Bin.'mj-test-schedules', O_CREAT|O_RDWR, 0666)
    or die $!;
#    sysopen(DB_SCHEDULE_SAFETYLOCK, $Bin.'/mj-test-schedules',  O_RDW
+R|O_CREAT, 0666);
    
    
#open FILE, ">", $Bin.'/filename.txt' or die $!;

open (DF,$Bin.'/mj-test-schedules') or die $!;
flock (DF, LOCK_SH) or die $!;

$href=retrieve_fd(*DF);
close DF;


    while ( my ($key, $value) = each(%$href) ) {
        print "$key => $value\n";
    }

#print  FILE $_ while (<DB_SCHEDULE_SAFETYLOCK>) ;
    

#close FILE;

untie %hash;

In addition I don't understand (and that is probably the problem) what MLDb does and how Storable and MLDb work together.
Please, someone can help me?
Thank you very much.

[tokpela]

If you are looking at saving data to disk in a hash structure, my recommendation is to use DBM::Deep.

It's pure Perl, fast and very stable.

use strict;
use warnings;

use DBM::Deep;

my $dbm = DBM::Deep->new('mj-test-schedules');

$dbm->{'some_key_name'} = 'some value';

for (keys %$dbm) ) {
   print "$_ => $dbm->{$_}\n";
}

[saintex]

I tried your code, but unluckily I have:
DBM::Deep: Signature not found -- file is not a Deep DB at prova2.pl line 6 Br />