README uptodate
This commit is contained in:
parent
4e2b89c419
commit
e81f59834d
56
README
56
README
|
@ -1,56 +0,0 @@
|
||||||
= Dependencies
|
|
||||||
|
|
||||||
== Bdb
|
|
||||||
|
|
||||||
Your need first this library:
|
|
||||||
|
|
||||||
http://github.com/DenisKnauf/bdb
|
|
||||||
|
|
||||||
= Download
|
|
||||||
|
|
||||||
via git:
|
|
||||||
|
|
||||||
git clone git://github.com/DenisKnauf/sbdb.git
|
|
||||||
|
|
||||||
= Installation
|
|
||||||
|
|
||||||
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', 'mynewdb', 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}" }
|
|
||||||
|
|
||||||
<strong>Don't forget to close everything, you've opened!</strong>
|
|
||||||
|
|
||||||
cursor.close
|
|
||||||
db.close
|
|
||||||
env.close
|
|
||||||
|
|
||||||
But you can use a <em>lambda</em> to ensure to close everything:
|
|
||||||
|
|
||||||
SBDB::Env.new( 'newenv', SBDB::CREATE) do |env|
|
|
||||||
env.open SBDB::Btree, 'newdb.db', 'mynewdb', SBDB::CREATE do |db|
|
|
||||||
db.to_hash
|
|
||||||
end
|
|
||||||
end
|
|
||||||
|
|
||||||
SBDB::DB#to_hash creates a cursor and close it later.
|
|
Loading…
Reference in a new issue