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File AnyDBM_File.pm

package AnyDBM_File;
use warnings;
use strict;

use 5.006_001;
our $VERSION = '1.01';
our @ISA = qw(NDBM_File DB_File GDBM_File SDBM_File ODBM_File) unless @ISA;

my $mod;
for $mod (@ISA) {
    if (eval "require $mod") {
	@ISA = ($mod);	# if we leave @ISA alone, warnings abound
	return 1;
    }
}

die "No DBM package was successfully found or installed";

__END__

=head1 NAME

AnyDBM_File - provide framework for multiple DBMs

NDBM_File, DB_File, GDBM_File, SDBM_File, ODBM_File - various DBM implementations

=head1 SYNOPSIS

use AnyDBM_File;

=head1 DESCRIPTION

This module is a "pure virtual base class"--it has nothing of its own.
It's just there to inherit from one of the various DBM packages.  It
prefers ndbm for compatibility reasons with Perl 4, then Berkeley DB (See
L<DB_File>), GDBM, SDBM (which is always there--it comes with Perl), and
finally ODBM.   This way old programs that used to use NDBM via dbmopen()
can still do so, but new ones can reorder @ISA:

BEGIN { @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File) }
    use AnyDBM_File;

Having multiple DBM implementations makes it trivial to copy database formats:

use Fcntl; use NDBM_File; use DB_File;
    tie %newhash,  'DB_File', $new_filename, O_CREAT|O_RDWR;
    tie %oldhash,  'NDBM_File', $old_filename, 1, 0;
    %newhash = %oldhash;

=head2 DBM Comparisons

Here's a partial table of features the different packages offer:

odbm    ndbm    sdbm    gdbm    bsd-db
			 ----	 ----    ----    ----    ------
 Linkage comes w/ perl   yes     yes     yes     yes     yes
 Src comes w/ perl       no      no      yes     no      no
 Comes w/ many unix os   yes     yes[0]  no      no      no
 Builds ok on !unix      ?       ?       yes     yes     ?
 Code Size               ?       ?       small   big     big
 Database Size           ?       ?       small   big?    ok[1]
 Speed                   ?       ?       slow    ok      fast
 FTPable                 no      no      yes     yes     yes
 Easy to build          N/A     N/A      yes     yes     ok[2]
 Size limits             1k      4k      1k[3]   none    none
 Byte-order independent  no      no      no      no      yes
 Licensing restrictions  ?       ?       no      yes     no

=over 4

=item [0]

on mixed universe machines, may be in the bsd compat library,
which is often shunned.

=item [1]

Can be trimmed if you compile for one access method.

=item [2]

See L<DB_File>. 
Requires symbolic links.

=item [3]

By default, but can be redefined.

=back

=head1 SEE ALSO

dbm(3), ndbm(3), DB_File(3), L<perldbmfilter>

=cut

Name	Type	Size	Permission	Last Modified	Actions
.	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
..	DIR	-	drwxr-xr-x	2025-10-16 10:59:21
Attribute	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
B	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
CPAN	DIR	-	drwxr-xr-x	2024-03-13 04:56:46
Class	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Compress	DIR	-	drwxr-xr-x	2024-03-13 04:36:57
Config	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
DBM_Filter	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Devel	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
ExtUtils	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
File	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Getopt	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
I18N	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IO	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
IPC	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Locale	DIR	-	drwxr-xr-x	2025-07-28 08:08:32
Math	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Memoize	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Module	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Net	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Search	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Term	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Text	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Thread	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Tie	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
Time	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
URI	DIR	-	drwxr-xr-x	2024-03-13 04:36:40
Unicode	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
User	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
encoding	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
overload	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
pod	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
unicore	DIR	-	drwxr-xr-x	2025-07-29 10:57:24
vendor_perl	DIR	-	drwxr-xr-x	2025-07-28 08:07:18
warnings	DIR	-	drwxr-xr-x	2025-07-29 10:57:25
AnyDBM_File.pm	text/plain	2.56 KB	-rw-r--r--	2025-07-28 08:07:09
AutoLoader.pm	text/plain	15.43 KB	-rw-r--r--	2025-07-28 08:07:09
AutoSplit.pm	text/plain	19.18 KB	-rw-r--r--	2025-07-28 08:07:09
Benchmark.pm	text/plain	30.3 KB	-rw-r--r--	2025-07-28 08:07:09
CORE.pod	text/plain	3.11 KB	-rw-r--r--	2025-07-28 08:07:09
DB.pm	text/plain	18.48 KB	-rw-r--r--	2025-07-28 08:07:09
DBM_Filter.pm	text/plain	14.05 KB	-rw-r--r--	2025-07-28 08:07:09
DirHandle.pm	text/plain	1.52 KB	-rw-r--r--	2025-07-28 08:07:09
Dumpvalue.pm	text/plain	17.14 KB	-rw-r--r--	2025-07-28 08:07:09
English.pm	text/plain	4.65 KB	-rw-r--r--	2025-07-28 08:07:09
FileCache.pm	text/plain	5.44 KB	-rw-r--r--	2025-07-28 08:07:09
FileHandle.pm	text/plain	6.63 KB	-rw-r--r--	2025-07-28 08:07:09
FindBin.pm	text/plain	4.45 KB	-rw-r--r--	2025-07-28 08:07:09
Internals.pod	text/plain	2.52 KB	-rw-r--r--	2025-07-28 08:07:09
Memoize.pm	text/plain	35.34 KB	-rw-r--r--	2025-07-28 08:08:32
NEXT.pm	text/plain	18.4 KB	-rw-r--r--	2025-07-28 08:07:09
PerlIO.pm	text/plain	10.21 KB	-rw-r--r--	2025-07-28 08:07:09
Safe.pm	text/plain	24.49 KB	-rw-r--r--	2025-07-28 08:07:09
SelectSaver.pm	text/plain	1.05 KB	-rw-r--r--	2025-07-28 08:07:09
SelfLoader.pm	text/plain	17.28 KB	-rw-r--r--	2025-07-28 08:08:32
Symbol.pm	text/plain	4.69 KB	-rw-r--r--	2025-07-28 08:07:09
Test.pm	text/plain	29.35 KB	-rw-r--r--	2025-07-28 08:08:32
Thread.pm	text/plain	8.09 KB	-rw-r--r--	2025-07-28 08:07:09
UNIVERSAL.pm	text/plain	6.44 KB	-rw-r--r--	2025-07-28 08:07:09
URI.pm	text/plain	33.97 KB	-rw-r--r--	2018-01-09 06:42:55
XSLoader.pm	text/plain	11 KB	-rw-r--r--	2025-07-28 08:07:09
_charnames.pm	text/plain	32.39 KB	-rw-r--r--	2025-07-28 08:07:09
autouse.pm	text/plain	4.14 KB	-rw-r--r--	2025-07-28 08:07:09
base.pm	text/plain	10.72 KB	-rw-r--r--	2025-07-28 08:07:09
blib.pm	text/plain	2.04 KB	-rw-r--r--	2025-07-28 08:07:09
bytes.pm	text/plain	3.67 KB	-rw-r--r--	2025-07-28 08:07:09
bytes_heavy.pl	text/plain	758 B	-rw-r--r--	2025-07-28 08:07:09
charnames.pm	text/plain	20.38 KB	-rw-r--r--	2025-07-28 08:07:09
deprecate.pm	text/plain	3.01 KB	-rw-r--r--	2025-07-28 08:07:09
diagnostics.pm	text/plain	18.59 KB	-rw-r--r--	2025-07-28 08:07:09
dumpvar.pl	text/plain	15.19 KB	-rw-r--r--	2025-07-28 08:07:09
feature.pm	text/plain	16.68 KB	-rw-r--r--	2025-07-28 08:07:09
fields.pm	text/plain	9.27 KB	-rw-r--r--	2025-07-28 08:07:09
filetest.pm	text/plain	3.91 KB	-rw-r--r--	2025-07-28 08:07:09
if.pm	text/plain	3.26 KB	-rw-r--r--	2025-07-28 08:07:09
integer.pm	text/plain	3.18 KB	-rw-r--r--	2025-07-28 08:07:09
less.pm	text/plain	3.13 KB	-rw-r--r--	2025-07-28 08:07:09
locale.pm	text/plain	4.74 KB	-rw-r--r--	2025-07-28 08:07:09
meta_notation.pm	text/plain	2.07 KB	-rw-r--r--	2025-07-28 08:07:09
open.pm	text/plain	7.83 KB	-rw-r--r--	2025-07-28 08:08:32
overload.pm	text/plain	52.06 KB	-rw-r--r--	2025-07-28 08:07:09
overloading.pm	text/plain	1.77 KB	-rw-r--r--	2025-07-28 08:07:09
perl5db.pl	text/plain	309 KB	-rw-r--r--	2025-07-28 08:07:09
sigtrap.pm	text/plain	7.43 KB	-rw-r--r--	2025-07-28 08:07:09
sort.pm	text/plain	5.94 KB	-rw-r--r--	2025-07-28 08:07:09
strict.pm	text/plain	4.63 KB	-rw-r--r--	2025-07-28 08:07:09
subs.pm	text/plain	848 B	-rw-r--r--	2025-07-28 08:07:09
utf8.pm	text/plain	8.9 KB	-rw-r--r--	2025-07-28 08:07:09
utf8_heavy.pl	text/plain	30.87 KB	-rw-r--r--	2025-07-28 08:07:09
vars.pm	text/plain	2.36 KB	-rw-r--r--	2025-07-28 08:07:09
vmsish.pm	text/plain	4.21 KB	-rw-r--r--	2025-07-28 08:07:09
warnings.pm	text/plain	43.71 KB	-rw-r--r--	2025-07-28 08:07:09

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