module ActiveRecord class Base class ConnectionSpecification #:nodoc: attr_reader :config, :adapter_method def initialize (config, adapter_method) @config, @adapter_method = config, adapter_method end end ## # :singleton-method: # The connection handler class_attribute :connection_handler, :instance_writer => false self.connection_handler = ConnectionAdapters::ConnectionHandler.new # Returns the connection currently associated with the class. This can # also be used to "borrow" the connection to do database work that isn't # easily done without going straight to SQL. def connection self.class.connection end # Establishes the connection to the database. Accepts a hash as input where # the :adapter key must be specified with the name of a database adapter (in lower-case) # example for regular databases (MySQL, Postgresql, etc): # # ActiveRecord::Base.establish_connection( # :adapter => "mysql", # :host => "localhost", # :username => "myuser", # :password => "mypass", # :database => "somedatabase" # ) # # Example for SQLite database: # # ActiveRecord::Base.establish_connection( # :adapter => "sqlite", # :database => "path/to/dbfile" # ) # # Also accepts keys as strings (for parsing from YAML for example): # # ActiveRecord::Base.establish_connection( # "adapter" => "sqlite", # "database" => "path/to/dbfile" # ) # # The exceptions AdapterNotSpecified, AdapterNotFound and ArgumentError # may be returned on an error. def self.establish_connection(spec = nil) case spec when nil raise AdapterNotSpecified unless defined?(Rails.env) establish_connection(Rails.env) when ConnectionSpecification self.connection_handler.establish_connection(name, spec) when Symbol, String if configuration = configurations[spec.to_s] establish_connection(configuration) else raise AdapterNotSpecified, "#{spec} database is not configured" end else spec = spec.symbolize_keys unless spec.key?(:adapter) then raise AdapterNotSpecified, "database configuration does not specify adapter" end begin require "active_record/connection_adapters/#{spec[:adapter]}_adapter" rescue LoadError => e raise "Please install the #{spec[:adapter]} adapter: `gem install activerecord-#{spec[:adapter]}-adapter` (#{e})" end adapter_method = "#{spec[:adapter]}_connection" unless respond_to?(adapter_method) raise AdapterNotFound, "database configuration specifies nonexistent #{spec[:adapter]} adapter" end remove_connection establish_connection(ConnectionSpecification.new(spec, adapter_method)) end end class << self # Returns the connection currently associated with the class. This can # also be used to "borrow" the connection to do database work unrelated # to any of the specific Active Records. def connection retrieve_connection end # Returns the configuration of the associated connection as a hash: # # ActiveRecord::Base.connection_config # # => {:pool=>5, :timeout=>5000, :database=>"db/development.sqlite3", :adapter=>"sqlite3"} # # Please use only for reading. def connection_config connection_pool.spec.config end def connection_pool connection_handler.retrieve_connection_pool(self) end def retrieve_connection connection_handler.retrieve_connection(self) end # Returns true if Active Record is connected. def connected? connection_handler.connected?(self) end def remove_connection(klass = self) connection_handler.remove_connection(klass) end def clear_active_connections! connection_handler.clear_active_connections! end delegate :clear_reloadable_connections!, :clear_all_connections!,:verify_active_connections!, :to => :connection_handler end end end