9 our @ISA = qw(Tie::Hash);
10 our $VERSION = "1.03";
12 XSLoader::load 'ODBM_File', $VERSION;
20 ODBM_File - Tied access to odbm files
24 use Fcntl; # For O_RDWR, O_CREAT, etc.
27 # Now read and change the hash
28 $h{newkey} = newvalue;
36 C<ODBM_File> establishes a connection between a Perl hash variable and
37 a file in ODBM_File format;. You can manipulate the data in the file
38 just as if it were in a Perl hash, but when your program exits, the
39 data will remain in the file, to be used the next time your program
42 Use C<ODBM_File> with the Perl built-in C<tie> function to establish
43 the connection between the variable and the file. The arguments to
50 The hash variable you want to tie.
54 The string C<"ODBM_File">. (Ths tells Perl to use the C<ODBM_File>
55 package to perform the functions of the hash.)
59 The name of the file you want to tie to the hash.
69 Read-only access to the data in the file.
73 Write-only access to the data in the file.
77 Both read and write access.
81 If you want to create the file if it does not exist, add C<O_CREAT> to
82 any of these, as in the example. If you omit C<O_CREAT> and the file
83 does not already exist, the C<tie> call will fail.
87 The default permissions to use if a new file is created. The actual
88 permissions will be modified by the user's umask, so you should
89 probably use 0666 here. (See L<perlfunc/umask>.)
95 On failure, the C<tie> call returns an undefined value and probably
96 sets C<$!> to contain the reason the file could not be tied.
98 =head2 C<odbm store returned -1, errno 22, key "..." at ...>
100 This warning is emmitted when you try to store a key or a value that
101 is too long. It means that the change was not recorded in the
102 database. See BUGS AND WARNINGS below.
104 =head1 BUGS AND WARNINGS
106 There are a number of limits on the size of the data that you can
107 store in the ODBM file. The most important is that the length of a
108 key, plus the length of its associated value, may not exceed 1008
111 See L<perlfunc/tie>, L<perldbmfilter>, L<Fcntl>