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.IX Title "AnyDBM_File 3"
.TH AnyDBM_File 3 "2001-09-21" "perl v5.8.8" "Perl Programmers Reference Guide"
AnyDBM_File \- provide framework for multiple DBMs
NDBM_File, DB_File, GDBM_File, SDBM_File, ODBM_File \- various DBM implementations
This module is a \*(L"pure virtual base class\*(R"\-\-it has nothing of its own.
It's just there to inherit from one of the various \s-1DBM\s0 packages. It
prefers ndbm for compatibility reasons with Perl 4, then Berkeley \s-1DB\s0 (See
DB_File), \s-1GDBM\s0, \s-1SDBM\s0 (which is always there\*(--it comes with Perl), and
finally \s-1ODBM\s0. This way old programs that used to use \s-1NDBM\s0 via \fIdbmopen()\fR
can still do so, but new ones can reorder \f(CW@ISA:\fR
\& BEGIN { @AnyDBM_File::ISA = qw(DB_File GDBM_File NDBM_File) }
Having multiple \s-1DBM\s0 implementations makes it trivial to copy database formats:
\& use POSIX; use NDBM_File; use DB_File;
\& tie %newhash, 'DB_File', $new_filename, O_CREAT|O_RDWR;
\& tie %oldhash, 'NDBM_File', $old_filename, 1, 0;
.Sh "\s-1DBM\s0 Comparisons"
.IX Subsection "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
on mixed universe machines, may be in the bsd compat library,
Can be trimmed if you compile for one access method.
By default, but can be redefined.
\&\fIdbm\fR\|(3), \fIndbm\fR\|(3), \fIDB_File\fR\|(3), perldbmfilter
projects / OpenSPARC-T2-SAM / blob