NDBM_File Tied access to ndbm files
Download

NDBM_File Ranking & Summary

NDBM_File Tags

Perl module Access Perl access ndbm access ndbm

NDBM_File Description

Tied access to ndbm files NDBM_File is a Perl module that allows tied access to ndbm files.SYNOPSIS use Fcntl; # For O_RDWR, O_CREAT, etc. use NDBM_File; tie(%h, 'NDBM_File', 'filename', O_RDWR|O_CREAT, 0666) or die "Couldn't tie NDBM file 'filename': $!; aborting"; # Now read and change the hash $h{newkey} = newvalue; print $h{oldkey}; ... untie %h;NDBM_File establishes a connection between a Perl hash variable and a file in NDBM_File format;. You can manipulate the data in the file just as if it were in a Perl hash, but when your program exits, the data will remain in the file, to be used the next time your program runs.Use NDBM_File with the Perl built-in tie function to establish the connection between the variable and the file. The arguments to tie should be:The hash variable you want to tie.The string "NDBM_File". (Ths tells Perl to use the NDBM_File package to perform the functions of the hash.)The name of the file you want to tie to the hash.Flags. Use one of: O_RDONLYRead-only access to the data in the file.O_WRONLYWrite-only access to the data in the file.O_RDWRBoth read and write access.If you want to create the file if it does not exist, add O_CREAT to any of these, as in the example. If you omit O_CREAT and the file does not already exist, the tie call will fail.The default permissions to use if a new file is created. The actual permissions will be modified by the user's umask, so you should probably use 0666 here. (See "umask" in perlfunc.) Requirements: · Perl

NDBM_File Related Software