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module ActiveRecord
module ConnectionHandling
# Establishes the connection to the database. Accepts a hash as input where
# the <tt>:adapter</tt> 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
ActiveRecord::RuntimeRegistry.connection_id
end
def connection_id=(connection_id)
ActiveRecord::RuntimeRegistry.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
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