No se puede conectar mysql desde Sequel gem

Question

Cuando intento conectarme a MySQL desde Sequel. Me estoy haciendo estos errores:

require 'rubygems' 
     require 'sequel' 
     DB = Sequel.connect(:adapter => 'mysql', :user => 'root', :host => 'localhost', :database => 'scanty',:password=>'xx') 
     DB.tables 
    Sequel::DatabaseConnectionError: NameError uninitialized constant Mysql::CLIENT_MULTI_RESULTS 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/adapters/mysql.rb:98:in `connect' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/database.rb:92:in `initialize' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:166:in `call' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:166:in `make_new' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:153:in `available' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:144:in `acquire' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:143:in `synchronize' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:143:in `acquire' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/connection_pool.rb:105:in `hold' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/database.rb:471:in `synchronize' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/adapters/mysql.rb:128:in `execute' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/dataset.rb:314:in `execute' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/adapters/mysql.rb:342:in `execute' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/adapters/mysql.rb:298:in `fetch_rows' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/dataset.rb:185:in `each' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/dataset/convenience.rb:156:in `map' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/dataset/convenience.rb:156:in `map' 
     from /opt/local/lib/ruby/gems/1.8/gems/sequel-3.2.0/lib/sequel/adapters/shared/mysql.rb:60:in `tables' 
     from (irb):6irb(main):007:0> Sequel::DatabaseConnectionError: NameErro 

Answer 1

Necesita instalar el controlador MySQL nativo, el ruby ​​puro no es compatible con Sequel.

Dependiendo de su instalación de Ruby, simplemente hacer gem install mysql puede ser suficiente. Sin embargo, si el archivo Ruby mysql.rb puro ya está en su ruta de carga de Ruby, debe eliminarlo de la ruta de carga o usar gem('mysql') antes de llamar al Sequel.connect.

Answer 2

Te estas perdiendo el :host=>'localhost' o lo que su anfitrión es.

Además, y esto es solo por razones de rendimiento, debe intentar habilitar :compress. Puede ahorrar una TONELADA de ancho de banda.

http://sequel.rubyforge.org/rdoc/files/doc/opening_databases_rdoc.html

Editar: OK, si no es el anfitrión, tal vez es un conflicto? Ver http://groups.google.com/group/sequel-talk/browse_thread/thread/ee39640a92351f1?pli=1. También http://www.mail-archive.com/sequel-talk@googlegroups.com/msg02275.html