GNU dbm is a library for simple databases. A database is a file that stores key-value pairs. Gdbm allows the user to store, retrieve, and delete data by key. It furthermore allows a non-sorted traversal of all key-value pairs. A gdbm database thus provides the same functionality as a hash. As with objects of the Hash class, elements can be accessed with []. Furthermore, GDBM mixes in the Enumerable module, thus providing convenient methods such as #find, #collect, #map, etc.
A process is allowed to open several different databases at the same time. A process can open a database as a "reader" or a "writer". Whereas a reader has only read-access to the database, a writer has read- and write-access. A database can be accessed either by any number of readers or by exactly one writer at the same time.
sudo apt install libgdbm-dev
sudo dnf install gdbm-devel
or if you are using an older version of Redhat or Fedora that uses Yum:
sudo yum install gdbm-devel
If you are using Homebrew, you can install gdbm with the following command:
brew install gdbm
or if you are using MacPorts, you can install gdbm with:
sudo port install gdbm
Add this line to your application's Gemfile:
gem 'gdbm'And then execute:
$ bundle
Or install it yourself as:
$ gem install gdbm
gem install gdbm -- --with-gdbm-dir=$(brew --prefix gdbm)
- Opening/creating a database, and filling it with some entries: require 'gdbm'
gdbm = GDBM.new("fruitstore.db")
gdbm["ananas"] = "3"
gdbm["banana"] = "8"
gdbm["cranberry"] = "4909"
gdbm.close- Reading out a database:
require 'gdbm'
gdbm = GDBM.new("fruitstore.db")
gdbm.each_pair do |key, value|
print "#{key}: #{value}\n"
end
gdbm.closeBug reports and pull requests are welcome on GitHub at https://github.com/ruby/gdbm.
The gem is available as open source under the terms of the 2-Clause BSD License.