NAME

SYNOPSIS

    use Attribute::Persistent;

    my %hash :persistent;
    $hash{counter}++; # Value retained between calls to the program.

    my %hash2 :persistent(SessionTable); # Explicitly provide a filename.

DESCRIPTION

It's useful for quick hacks when you don't care about pulling in the right DBM library and calling "tie" and so on. Its job is to reduce fuss for the lazy programmer at the cost of flexibility.

It uses "MLDBM", so you can use complex data structures in your arrays and hashes. It uses "AnyDBM_File", so if you really care about which DBM you get, you can modify "AnyDBM_File::ISA" in a "BEGIN" block after loading this module.

It works out which DBMs belong to it by taking an md5 sum of the source code. This means that if you change your code, you lose your data. If you like to keep your data while messing about with your code, you need to explicitly give "Attribute::Persistent" a key, like this:

    BEGIN { $Attribute::Persistent::KEY = "MyProgram"; }
    use Attribute::Persistent; # Order is important.

This uniquely identifies your program, meaning that the module doesn't have to grub around with $0 and md5 sums.

But hell, it's not supposed to be this complex. Just use the module and slap ":persistent" onto your lexicals where appropriate, and it just works. That's all most people need to care about.

AUTHOR

Maintained by Scott Penrose, "scott@cpan.org"

LICENSE