56 lines
1.1 KiB
Markdown
56 lines
1.1 KiB
Markdown
Dependencies
|
|
============
|
|
|
|
You need first the [Bdb](http://github.com/DenisKnauf/bdb) and of course [ruby](http://ruby-lang.org).
|
|
|
|
Download
|
|
========
|
|
|
|
via git:
|
|
|
|
git clone git://github.com/DenisKnauf/sbdb.git
|
|
|
|
Install
|
|
=======
|
|
|
|
gem build sbdb.gemspec
|
|
gem install sbdb-*.gem
|
|
|
|
Usage
|
|
=====
|
|
|
|
First, open environment and database
|
|
|
|
require 'sbdb'
|
|
Dir.mkdir 'newenv' rescue Errno::EEXIST
|
|
env = SBDB::Env.new 'newenv', SBDB::CREATE
|
|
db = env.open SBDB::Btree, 'newdb.db', :flags => SBDB::CREATE
|
|
|
|
It works nearly like a Ruby-Hash:
|
|
|
|
db['key'] = 'value'
|
|
db['key'] # => 'value'
|
|
db.to_hash # => {'key'=>'value'}
|
|
db.map {|k, v| [k, v].join ' => '} # => ["key => value"]
|
|
db.count # => 1
|
|
|
|
SBDB::DB#each uses a SBDB::Cursor:
|
|
|
|
cursor = db.cursor
|
|
cursor.each {|k,v| puts "#{k}: ${v}" }
|
|
|
|
**Don't forget to close everything, you've opened!**
|
|
|
|
cursor.close
|
|
db.close
|
|
env.close
|
|
|
|
But you can use a *lambda* to ensure to close everything:
|
|
|
|
SBDB::Env.new( 'newenv', SBDB::CREATE) do |env|
|
|
env.open SBDB::Btree, 'newdb.db', :flags => SBDB::CREATE do |db|
|
|
db.to_hash
|
|
end
|
|
end
|
|
|
|
SBDB::DB#to_hash creates a cursor and close it later.
|