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= libcdb-ruby - Ruby bindings for CDB Constant Databases.
This documentation refers to libcdb-ruby version 0.2.1
The libcdb-ruby library provides Ruby bindings for the
TinyCDB[] package for
creating and reading {constant databases}[].
require 'libcdb'
# creating'foo.cdb', 'w') { |cdb|
cdb['a'] = 'one'
cdb['b'] = '123'
# reading'foo.cdb') { |cdb|
cdb['a'] #=> "one"
cdb['b'] #=> "123"
cdb['c'] #=> nil
# hybrid'foo.cdb', 'w+') { |cdb|
cdb['a'] = 'one'
cdb['b'] = '123'
cdb['a'] #=> "one"
cdb['b'] #=> "123"
cdb['c'] #=> nil
# database is truncated whenever
# a new writer is opened:
cdb['a'] = 'two'
cdb['c'] = 'xyz'
cdb['a'] #=> "two"
cdb['b'] #=> nil
cdb['c'] #=> "xyz"
# update existing database'foo.cdb', 'r+') { |cdb|
# store existing records
cdb << cdb.to_h
# and add a new one
cdb['d'] = '42'
cdb['a'] #=> "two"
cdb['b'] #=> nil
cdb['c'] #=> "xyz"
cdb['d'] #=> "42"
* Ruby 1.9+ (see {below}[rdoc-label:label-SUPPORTED+PLATFORMS] for details)
* TinyCDB[] headers (not needed when
installing the fat binary gem on Windows)
Debian/Ubuntu:: +libcdb-dev+
Fedora/SuSE:: +tinycdb-devel+
Gentoo:: +dev-db/tinycdb+
Linux:: MRI 1.9.3, 2.0 & 2.1 (Tested on 64-bit Ubuntu GNU/Linux
with 1.9.3p550, 2.0.0p594 and 2.1.5p273)
Windows:: MRI 1.9.3 (Tested on 32-bit Windows XP with 1.9.3p194)
Source code::
Travis CI::
* Jens Wille <>
This project was inspired by ruby-cdb[] and
cdb-full[]. The code organization, especially the
extension part, was modeled after libxml-ruby[].
And props to the rake-compiler[]
team for making extension building such a breeze :)
Copyright (C) 2012 University of Cologne,
Albertus-Magnus-Platz, 50923 Cologne, Germany
Copyright (C) 2013-2016 Jens Wille
libcdb-ruby is free software: you can redistribute it and/or modify it
under the terms of the GNU Affero General Public License as published by
the Free Software Foundation, either version 3 of the License, or (at your
option) any later version.
libcdb-ruby is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Affero General Public
License for more details.
You should have received a copy of the GNU Affero General Public License
along with libcdb-ruby. If not, see <>.
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