module ActiveRecord module ConnectionHandling # 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" # ) # # Or a URL: # # ActiveRecord::Base.establish_connection( # "postgres://myuser:mypass@localhost/somedatabase" # ) # # The exceptions AdapterNotSpecified, AdapterNotFound and ArgumentError # may be returned on an error. def establish_connection(spec = ENV["DATABASE_URL"]) resolver = ConnectionAdapters::ConnectionSpecification::Resolver.new spec, configurations spec = resolver.spec unless respond_to?(spec.adapter_method) raise AdapterNotFound, "database configuration specifies nonexistent #{spec.config[:adapter]} adapter" end remove_connection connection_handler.establish_connection self, spec end # 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 def connection_id Thread.current['ActiveRecord::Base.connection_id'] end def connection_id=(connection_id) Thread.current['ActiveRecord::Base.connection_id'] = connection_id 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) or raise ConnectionNotEstablished 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_cache! # :nodoc: connection.schema_cache.clear! end delegate :clear_active_connections!, :clear_reloadable_connections!, :clear_all_connections!, :to => :connection_handler end end