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Re: Arrays of anonymous hashes in a DBM file?

by araqnid (Beadle)
on Apr 08, 2001 at 22:07 UTC ( #70861=note: print w/replies, xml ) Need Help??

in reply to Arrays of anonymous hashes in a DBM file?

Perhaps you could look at the BerkeleyDB CPAN module.

This is an interface to BerkeleyDB (2.x or 3.x) that uses the native API instead of the DB1.85 API used by DB_File.

The reason I think it's relevant is that you can use a "Recno" format database, and tie it to an array. (However, the documenation is unclear on this, and I haven't got the module installed to hand).

Here is an extract from an example in the documentation:

use strict; use BerkeleyDB; my $filename = "text" ; unlink $filename ; my @h ; tie @h, 'BerkeleyDB::Recno', -filename => $filename, -Flags => DB_CREATE, -Property => DB_RENUMBER or die "Cannot open $filename: $!\n" ; # Add a few key/value pairs to the file $h[0] = "orange" ; $h[1] = "blue" ; $h[2] = "yellow" ; push @h, "green", "black" ;

The problem then becomes if you can actually use MLDBM to tie an array instead of a hash, and TBH I don't know.

But I would have thought it would be fairly easy to add such functionality to MLDBM if it isn't there.

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[hippo]: I had a low-paid job about 20 years ago and seriously considered going down to a 3-day week. Would have worked 60% of the time for about 80% of the cash.
[Corion]: ambrus: Well, I pay rent, but don't own a house with variable/ unforeseeable costs
[hippo]: The thesholds/benefits balance at the time was nuts.
[hippo]: But that doesn't last because, you know ... politicians. :(
[Corion]: hippo: Yeah, if you still get enough money to get by and don't have expensive hobbies or other fixed costs that can work out well
[ambrus]: ah good. I pay only rent too. but that still costs significant money.
[Corion]: ambrus: Yes, but that is already budgeted for

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