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AnyDBM_File.pm	2.56 KB	-rwxrwxrwx	2020-06-20 19:33
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DB.pm	18.48 KB	-rwxrwxrwx	2020-06-20 19:33
DBM_Filter.pm	14.05 KB	-rwxrwxrwx	2020-06-20 19:33
Digest.pm	10.45 KB	-rwxrwxrwx	2020-06-20 19:33
DirHandle.pm	1.52 KB	-rwxrwxrwx	2020-06-20 19:33
Dumpvalue.pm	17.14 KB	-rwxrwxrwx	2020-06-20 19:33
English.pm	4.65 KB	-rwxrwxrwx	2020-06-20 19:33
Env.pm	5.39 KB	-rwxrwxrwx	2020-06-20 19:33
Exporter.pm	2.31 KB	-rwxrwxrwx	2020-06-20 19:33
Fatal.pm	56.91 KB	-rwxrwxrwx	2020-06-20 19:33
FileCache.pm	5.44 KB	-rwxrwxrwx	2020-06-20 19:33
FileHandle.pm	2.06 KB	-rwxrwxrwx	2020-06-20 19:33
FindBin.pm	4.45 KB	-rwxrwxrwx	2020-06-20 19:33
Memoize.pm	35.34 KB	-rwxrwxrwx	2020-06-20 19:33
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bytes.pm	447 B	-rwxrwxrwx	2020-06-20 19:33
bytes_heavy.pl	758 B	-rwxrwxrwx	2020-06-20 19:33
charnames.pm	20.5 KB	-rwxrwxrwx	2020-06-20 19:33
constant.pm	5.6 KB	-rwxrwxrwx	2020-06-20 19:33
deprecate.pm	3.43 KB	-rwxrwxrwx	2020-06-20 19:33
diagnostics.pm	18.26 KB	-rwxrwxrwx	2020-06-20 19:33
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experimental.pm	5.66 KB	-rwxrwxrwx	2020-06-20 19:33
feature.pm	4.21 KB	-rwxrwxrwx	2020-06-20 19:33
fields.pm	4.9 KB	-rwxrwxrwx	2020-06-20 19:33
filetest.pm	3.91 KB	-rwxrwxrwx	2020-06-20 19:33
if.pm	3.26 KB	-rwxrwxrwx	2020-06-20 19:33
integer.pm	172 B	-rwxrwxrwx	2020-06-20 19:33
less.pm	3.13 KB	-rwxrwxrwx	2020-06-20 19:33
locale.pm	3.34 KB	-rwxrwxrwx	2020-06-20 19:33
meta_notation.pm	2.07 KB	-rwxrwxrwx	2020-06-20 19:33
ok.pm	968 B	-rwxrwxrwx	2020-06-20 19:33
open.pm	7.83 KB	-rwxrwxrwx	2020-06-20 19:33
overload.pm	4.36 KB	-rwxrwxrwx	2020-06-20 19:33
overloading.pm	964 B	-rwxrwxrwx	2020-06-20 19:33
parent.pm	479 B	-rwxrwxrwx	2020-06-20 19:33
perl5db.pl	308.8 KB	-rwxrwxrwx	2020-06-20 19:33
perlfaq.pm	78 B	-rwxrwxrwx	2020-06-20 19:33
sigtrap.pm	7.43 KB	-rwxrwxrwx	2020-06-20 19:33
sort.pm	5.94 KB	-rwxrwxrwx	2020-06-20 19:33
strict.pm	1.57 KB	-rwxrwxrwx	2020-06-20 19:33
subs.pm	848 B	-rwxrwxrwx	2020-06-20 19:33
utf8.pm	342 B	-rwxrwxrwx	2020-06-20 19:33
utf8_heavy.pl	30.87 KB	-rwxrwxrwx	2020-06-20 19:33
vars.pm	1.12 KB	-rwxrwxrwx	2020-06-20 19:33
version.pm	1.67 KB	-rwxrwxrwx	2020-06-20 19:33
version.pod	9.63 KB	-rwxrwxrwx	2020-06-20 19:33
vmsish.pm	4.21 KB	-rwxrwxrwx	2020-06-20 19:33
warnings.pm	21.13 KB	-rwxrwxrwx	2020-06-20 19:33

Rename

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