Dependencies
You need first the Bdb and of course ruby.
Download
via git:
git clone git://github.com/ruby-bdb/sbdb
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 | SBDB::Env::INIT_TRANSACTION
db = env.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" } # => ["key => value"]
db.count # => 1
db.each {|k,v| puts "#{k}: #{v}" }
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 | SBDB::Env::INIT_TRANSACTION) 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.
Tip:
Signal.trap 'EXIT', env.method( :close)